Hi,

On 01/02/2014 08:52 AM, Aditya Kousik wrote:

Hello all,

We've tried to run a basic test-printf script on a Freescale i.MX6 sabrelite board. Based on thishttp://sourceforge.net/p/genode/mailman/message/31760885/, we implemented the necessary files. We had also come across an i.MX6 branch by Nikolay Golikov stating that he had a preliminary port of i.MX6 here: https://github.com/decaprox/genode/tree/i.mx6

We ran RUN_OPT="--target=uboot" make run/printf to see if it does print "-1 = -1 = -1" to the serial console (tested with gtkterm).

We ran the boot image uImage through TFTP at load address 0x10800000. It loads the kernel (267.9 kB) but stops at "Loading kernel".

Assuming, your resulting kernel image is linked to 0x10001000, and ends at about 0x102cbc55, like the result I got when compiling Nikolay's branch, your load address for the u-boot uImage sounds reasonable. Unfortunately, I can't reproduce your experiments, because I don't have such a board available. The first thing that comes to my mind is, that Nikolay used another board containing the i.MX6 SoC than you with another memory layout of the related peripherals.

How do we know if the kernel is indeed running, or are we checking the right UART ports? (we checked UART1)

First at all, you should add a printf command like:

PDBG("kernel started!")"

at the very beginning of the kernel's execution. In Nikolay's branch I would add it here:

https://github.com/decaprox/genode/blob/i.mx6/base-hw/src/core/kernel.cc#L13...

If that message isn't printed, very likely your UART definitions aren't correct.

I gave "console=ttymxc0, 115200" as bootargs in u-boot. Any suggestions on how to proceed? Because we are literally stuck.

Forget about "bootargs" in u-boot. They are specific to booting the Linux kernel. U-boot puts them into the Linux/ARM specific ATAG structure. In Genode that structure isn't used. It's hard coded in the kernel, which UART is used for kernel/core debug messages. In Nikolay's branch, he uses the UART with memory mapped I/O located at 0x02020000, and with the following UART definition:

https://github.com/decaprox/genode/blob/i.mx6/base/include/drivers/uart/imx3...

Please check whether this corresponds with your board's definitions.

Also, is there a good debugging tool for testing the genode environment on direct hardware?

Well, there is JTAG of course, which isn't related to Genode specifically. There are other debugging utils available on Genode, like GDB, but that wouldn't help on that low level you're currently working at.

Regards Stefan

Thanks in advance Aditya Kousik

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Hi Aditya,

On 01/06/2014 09:18 AM, Aditya Kousik wrote:

Hello Stefan,

I added the print debug call inside extern "C" void kernel() function as you'd suggested. Still no response from the processor.

I checked the address specifications in both Imx31_uart_base.h and also base/include/platform/imx6/board_base.h in Nikolay's branch. They are correct, to the dot. Even AIPS mapping in board.h in base-hw's core. The definitions seem to be fine.

Ideally, what is expected to happen, i.e, the expected course of action? we can't load the kernel by running 'bootm' since you say it uses a different config. So what do we do with the uImage?

Well, I can't follow your conclusions to not using bootm? You've a complete scenario packed into an ELF image, which is built to be loaded at start address 0x10001000. This ELF image is used by u-boot's mkimage utility to form a uImage file. This uImage can be loaded to some address above 0x10300000 e.g. via TFTP like you did it. Assuming you've loaded the uImage to 0x10800000, you should boot the scenario with "bootm 0x10800000". After that u-boot will interpret the uImage header at that address, load the ELF image within the uImage to the appropriated memory sections, prepare the machine registers, and finally jump to 0x10001000.

1. I loaded the uImage to 0x10800000 with TFTP as 'tftp 10800000'. It

succesfully loaded the kernel to that address. At this point, I had changed the load address to 10002000 to check if the image was read properly. It did. 2. As a different approach, ran 'go 10002000'. This was what I got "##Application started at 0x10002000, Application terminated, rc = 0x100A4004"

Using the 'go XXX' command let u-boot simply load that address into the ip register. As you've loaded an uImage to the related address, the machine executes the u-boot image header information, which of course fails. Even if you load the ELF image by hand to the appropriated memory sections, it is not recommended to use the 'go' command, as u-boot doesn't prepare the machine as expected. For instance, the kernel gets executed with the MMU enabled using u-boot's page-table setup etc.

What is the sequence of events, the programs that are sequentially executed to say that the kernel is 'running'?

In your case I assume:

tftp 0x10800000 <network path to uImage> bootm 0x10800000

One further problem might be that u-boot's own memory sections (binary data, exception vector) clashes with the scenario ones. Unfortunately, mostly u-boot doesn't warn you if it fails to load the whole image due to memory clashes. Therefore, it would be good, if it's possible to you, to analyze the memory layout of the u-boot binary used on your platform, e.g.: "readelf -S <u-boot binary>"

If there's a clash you can change the "LD_TEXT_ADDR" variable in "base-hw/mk/spec-hw_imx6.mk" to another non-clashing address.

Regards Stefan

Thanks in advance Aditya Kousik

On Thu, Jan 2, 2014 at 4:33 PM, Stefan Kalkowski < stefan.kalkowski@...1...> wrote:

...

Hi,

On 01/02/2014 08:52 AM, Aditya Kousik wrote:

...

Hello all,

We've tried to run a basic test-printf script on a Freescale i.MX6 sabrelite board. Based on thishttp://sourceforge.net/p/genode/mailman/message/31760885/, we implemented the necessary files. We had also come across an i.MX6

branch

...

by Nikolay Golikov stating that he had a preliminary port of i.MX6 here: https://github.com/decaprox/genode/tree/i.mx6

We ran RUN_OPT="--target=uboot" make run/printf to see if it does print

"-1

...

= -1 = -1" to the serial console (tested with gtkterm).

We ran the boot image uImage through TFTP at load address 0x10800000. It loads the kernel (267.9 kB) but stops at "Loading kernel".

Assuming, your resulting kernel image is linked to 0x10001000, and ends at about 0x102cbc55, like the result I got when compiling Nikolay's branch, your load address for the u-boot uImage sounds reasonable. Unfortunately, I can't reproduce your experiments, because I don't have such a board available. The first thing that comes to my mind is, that Nikolay used another board containing the i.MX6 SoC than you with another memory layout of the related peripherals.

...

How do we know if the kernel is indeed running, or are we checking the right UART ports? (we checked UART1)

First at all, you should add a printf command like:

PDBG("kernel started!")"

at the very beginning of the kernel's execution. In Nikolay's branch I would add it here:

https://github.com/decaprox/genode/blob/i.mx6/base-hw/src/core/kernel.cc#L13...

If that message isn't printed, very likely your UART definitions aren't correct.

...

I gave "console=ttymxc0, 115200" as bootargs in u-boot. Any suggestions

on

...

how to proceed? Because we are literally stuck.

Forget about "bootargs" in u-boot. They are specific to booting the Linux kernel. U-boot puts them into the Linux/ARM specific ATAG structure. In Genode that structure isn't used. It's hard coded in the kernel, which UART is used for kernel/core debug messages. In Nikolay's branch, he uses the UART with memory mapped I/O located at 0x02020000, and with the following UART definition:

https://github.com/decaprox/genode/blob/i.mx6/base/include/drivers/uart/imx3...

Please check whether this corresponds with your board's definitions.

...

Also, is there a good debugging tool for testing the genode environment

on

...

direct hardware?

Well, there is JTAG of course, which isn't related to Genode specifically. There are other debugging utils available on Genode, like GDB, but that wouldn't help on that low level you're currently working at.

Regards Stefan

...

Thanks in advance Aditya Kousik

---

...

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...

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-- Stefan Kalkowski Genode Labs

http://www.genode-labs.com/ · http://genode.org/

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Hi Aditya,

On 01/09/2014 08:30 AM, Aditya Kousik wrote:

Hello Stefan,

I was looking for alternate methods of running the program loaded at address 10001000. That was the only motive behind trying go. I kept using bootm till then. I wasn't exactly able to check where u-boot loaded its own memory sections. So instead, I set the load address for the kernel way above at 20000000 where I'm sure nothing else clashed. And loaded the uImage to 20800000.

I recommend using a self-compiled u-boot on you imx6 board. Therefore, you'll be able to check its memory regions.

While it's still stuck at 'Starting kernel...' , I'll take your previous advice seriously. To use a JTAG debugger or recheck the UART definitions.

Moreover, you might skip the UART initialization routine. Just comment the body of the Imx31_uart_base constructor out in:

base/include/drivers/uart/imx31_uart_base.h

The UART should be initialized by u-boot anyway.

Of course, if you've a JTAG debugger present, and a corresponding connector on your test board, this probably will be the most comfortable path.

I ran test-printf on linux and this is what I got:

spawn ./core int main(): --- create local services --- int main(): --- start init --- int main(): transferred 17592186044415 MB to init int main(): --- init created, waiting for exit condition --- [init] Could not open file "ld.lib.so" Quota exceeded! amount=4096, size=4096, consumed=4096 [init] upgrading quota donation for SIGNAL session [init -> test-printf] -1 = -1 = -1 Test succeeded

Am I supposed to get similar messages from core on my board?

Yes that's right.

Regards Stefan

Thanks in advance Aditya

On Mon, Jan 6, 2014 at 3:28 PM, Stefan Kalkowski < stefan.kalkowski@...1...> wrote:

...

Hi Aditya,

On 01/06/2014 09:18 AM, Aditya Kousik wrote:

...

Hello Stefan,

I added the print debug call inside extern "C" void kernel() function as you'd suggested. Still no response from the processor.

I checked the address specifications in both Imx31_uart_base.h and also base/include/platform/imx6/board_base.h in Nikolay's branch. They are correct, to the dot. Even AIPS mapping in board.h in base-hw's core. The definitions seem to be fine.

Ideally, what is expected to happen, i.e, the expected course of action?

we

...

can't load the kernel by running 'bootm' since you say it uses a

different

...

config. So what do we do with the uImage?

Well, I can't follow your conclusions to not using bootm? You've a complete scenario packed into an ELF image, which is built to be loaded at start address 0x10001000. This ELF image is used by u-boot's mkimage utility to form a uImage file. This uImage can be loaded to some address above 0x10300000 e.g. via TFTP like you did it. Assuming you've loaded the uImage to 0x10800000, you should boot the scenario with "bootm 0x10800000". After that u-boot will interpret the uImage header at that address, load the ELF image within the uImage to the appropriated memory sections, prepare the machine registers, and finally jump to 0x10001000.

...

1. I loaded the uImage to 0x10800000 with TFTP as 'tftp 10800000'. It

succesfully loaded the kernel to that address. At this point, I had

changed

...

the load address to 10002000 to check if the image was read properly. It did. 2. As a different approach, ran 'go 10002000'. This was what I got "##Application started at 0x10002000, Application terminated, rc = 0x100A4004"

Using the 'go XXX' command let u-boot simply load that address into the ip register. As you've loaded an uImage to the related address, the machine executes the u-boot image header information, which of course fails. Even if you load the ELF image by hand to the appropriated memory sections, it is not recommended to use the 'go' command, as u-boot doesn't prepare the machine as expected. For instance, the kernel gets executed with the MMU enabled using u-boot's page-table setup etc.

...

What is the sequence of events, the programs that are sequentially

executed

...

to say that the kernel is 'running'?

In your case I assume:

tftp 0x10800000 <network path to uImage> bootm 0x10800000

One further problem might be that u-boot's own memory sections (binary data, exception vector) clashes with the scenario ones. Unfortunately, mostly u-boot doesn't warn you if it fails to load the whole image due to memory clashes. Therefore, it would be good, if it's possible to you, to analyze the memory layout of the u-boot binary used on your platform, e.g.: "readelf -S <u-boot binary>"

If there's a clash you can change the "LD_TEXT_ADDR" variable in "base-hw/mk/spec-hw_imx6.mk" to another non-clashing address.

Regards Stefan

...

Thanks in advance Aditya Kousik

On Thu, Jan 2, 2014 at 4:33 PM, Stefan Kalkowski < stefan.kalkowski@...1...> wrote:

...

Hi,

On 01/02/2014 08:52 AM, Aditya Kousik wrote:

...

Hello all,

We've tried to run a basic test-printf script on a Freescale i.MX6 sabrelite board. Based on thishttp://sourceforge.net/p/genode/mailman/message/31760885/, we implemented the necessary files. We had also come across an i.MX6

branch

...

by Nikolay Golikov stating that he had a preliminary port of i.MX6

here:

...

...

...

https://github.com/decaprox/genode/tree/i.mx6

We ran RUN_OPT="--target=uboot" make run/printf to see if it does print

"-1

...

= -1 = -1" to the serial console (tested with gtkterm).

We ran the boot image uImage through TFTP at load address 0x10800000.

It

...

...

...

loads the kernel (267.9 kB) but stops at "Loading kernel".

Assuming, your resulting kernel image is linked to 0x10001000, and ends at about 0x102cbc55, like the result I got when compiling Nikolay's branch, your load address for the u-boot uImage sounds reasonable. Unfortunately, I can't reproduce your experiments, because I don't have such a board available. The first thing that comes to my mind is, that Nikolay used another board containing the i.MX6 SoC than you with another memory layout of the related peripherals.

...

How do we know if the kernel is indeed running, or are we checking the right UART ports? (we checked UART1)

First at all, you should add a printf command like:

PDBG("kernel started!")"

at the very beginning of the kernel's execution. In Nikolay's branch I would add it here:

https://github.com/decaprox/genode/blob/i.mx6/base-hw/src/core/kernel.cc#L13...

...

...

If that message isn't printed, very likely your UART definitions aren't correct.

...

I gave "console=ttymxc0, 115200" as bootargs in u-boot. Any suggestions

on

...

how to proceed? Because we are literally stuck.

Forget about "bootargs" in u-boot. They are specific to booting the Linux kernel. U-boot puts them into the Linux/ARM specific ATAG structure. In Genode that structure isn't used. It's hard coded in the kernel, which UART is used for kernel/core debug messages. In Nikolay's branch, he uses the UART with memory mapped I/O located at 0x02020000, and with the following UART definition:

https://github.com/decaprox/genode/blob/i.mx6/base/include/drivers/uart/imx3...

...

...

Please check whether this corresponds with your board's definitions.

...

Also, is there a good debugging tool for testing the genode environment

on

...

direct hardware?

Well, there is JTAG of course, which isn't related to Genode specifically. There are other debugging utils available on Genode, like GDB, but that wouldn't help on that low level you're currently working

at.

...

...

Regards Stefan

...

Thanks in advance Aditya Kousik

---

...

...

...

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...

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http://www.genode-labs.com/ · http://genode.org/

---

...

...

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...

Java,.NET, & PHP application. Start your 15-day FREE TRIAL of

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...

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Pro!

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Hi Meenakshi,

On 01/18/2014 09:16 AM, Meenakshi Narayanan wrote:

Hi Stefan,

I'm working with Aditya on the port. We're now trying to blink an LED at the start of execution of the kernel (at the place where you asked us to print a PDBG), since the JTAG is going to take a while. We've tried using i.MX53's GPIO driver by modifying the register addresses in board_base.h.

well, I don't think this is the way to success.

Because you didn't finished to get some output from the UART, possibly because your kernel image isn't setup correctly, you're now trying to rope the far more complex GPIO driver code into the kernel? As long as things are working similar like within the i.MX53 SoC, moreover the GPIO pins depend on a correctly configured IOMUX controller, which is a ball of wires. Just to give you some complexity metric between both in form of reference manual pages, the IOMUX controller comprises 800 pages, and the UART about 80. To sum it up, setting up GPIO pins correctly is a far more error-prone task than setting up the UART on this platform.

What about my advices within the last mail, compiling your own u-boot, thereby having the ability to better check the setup of your kernel (e.g. via additional prints), and not initializing the UART within the kernel, because it's already done successfully by u-boot?

Moreover, you might start with a very easy binary (no complete Genode kernel/image), which you write from scratch. That binary can be some very simple assembler code, which only puts some character to the UART, and nothing more. If that fails too, it's probably a boot issue, which I would guess it is.

Basically, we need to write to the GPIO9 (GPIO1_IO09 in i.MX6) : Can this be accomplished by calling the read/write/direction functions in driver.h of os/src/driver/gpio. Or can we simply write to a register by implementing util/mmio.h?

Of course, you can use the classes in "util/mmio.h" to simply access I/O memory mapped registers. In fact, the MMIO framework is designed for that operation purpose. The code in "os/src/driver/gpio" is used for the user-level GPIO driver in Genode, and cannot be used directly within the base-hw kernel.

Regards Stefan

Thanks and regards Meenakshi

On Thu, Jan 9, 2014 at 3:14 PM, Stefan Kalkowski < stefan.kalkowski@...1...> wrote:

...

Hi Aditya,

On 01/09/2014 08:30 AM, Aditya Kousik wrote:

...

Hello Stefan,

I was looking for alternate methods of running the program loaded at address 10001000. That was the only motive behind trying go. I kept using bootm till then. I wasn't exactly able to check where u-boot loaded its

own

...

memory sections. So instead, I set the load address for the kernel way above at 20000000 where I'm sure nothing else clashed. And loaded the uImage to 20800000.

I recommend using a self-compiled u-boot on you imx6 board. Therefore, you'll be able to check its memory regions.

...

While it's still stuck at 'Starting kernel...' , I'll take your previous advice seriously. To use a JTAG debugger or recheck the UART definitions.

Moreover, you might skip the UART initialization routine. Just comment the body of the Imx31_uart_base constructor out in:

base/include/drivers/uart/imx31_uart_base.h

The UART should be initialized by u-boot anyway.

Of course, if you've a JTAG debugger present, and a corresponding connector on your test board, this probably will be the most comfortable path.

...

I ran test-printf on linux and this is what I got:

spawn ./core int main(): --- create local services --- int main(): --- start init --- int main(): transferred 17592186044415 MB to init int main(): --- init created, waiting for exit condition --- [init] Could not open file "ld.lib.so" Quota exceeded! amount=4096, size=4096, consumed=4096 [init] upgrading quota donation for SIGNAL session [init -> test-printf] -1 = -1 = -1 Test succeeded

Am I supposed to get similar messages from core on my board?

Yes that's right.

Regards Stefan

...

Thanks in advance Aditya

On Mon, Jan 6, 2014 at 3:28 PM, Stefan Kalkowski < stefan.kalkowski@...1...> wrote:

...

Hi Aditya,

On 01/06/2014 09:18 AM, Aditya Kousik wrote:

...

Hello Stefan,

I added the print debug call inside extern "C" void kernel() function

as

...

...

...

you'd suggested. Still no response from the processor.

I checked the address specifications in both Imx31_uart_base.h and also base/include/platform/imx6/board_base.h in Nikolay's branch. They are correct, to the dot. Even AIPS mapping in board.h in base-hw's core.

The

...

...

...

definitions seem to be fine.

Ideally, what is expected to happen, i.e, the expected course of

action?

...

...

we

...

can't load the kernel by running 'bootm' since you say it uses a

different

...

config. So what do we do with the uImage?

Well, I can't follow your conclusions to not using bootm? You've a complete scenario packed into an ELF image, which is built to be loaded at start address 0x10001000. This ELF image is used by u-boot's mkimage utility to form a uImage file. This uImage can be loaded to some address above 0x10300000 e.g. via TFTP like you did it. Assuming you've loaded the uImage to 0x10800000, you should boot the scenario with "bootm 0x10800000". After that u-boot will interpret the uImage header at that address, load the ELF image within the uImage to the appropriated memory sections, prepare the machine registers, and finally jump to 0x10001000.

...

1. I loaded the uImage to 0x10800000 with TFTP as 'tftp 10800000'. It

succesfully loaded the kernel to that address. At this point, I had

changed

...

the load address to 10002000 to check if the image was read properly.

It

...

...

...

did. 2. As a different approach, ran 'go 10002000'. This was what I got "##Application started at 0x10002000, Application terminated, rc = 0x100A4004"

Using the 'go XXX' command let u-boot simply load that address into the ip register. As you've loaded an uImage to the related address, the machine executes the u-boot image header information, which of course fails. Even if you load the ELF image by hand to the appropriated memory sections, it is not recommended to use the 'go' command, as u-boot doesn't prepare the machine as expected. For instance, the kernel gets executed with the MMU enabled using u-boot's page-table setup etc.

...

What is the sequence of events, the programs that are sequentially

executed

...

to say that the kernel is 'running'?

In your case I assume:

tftp 0x10800000 <network path to uImage> bootm 0x10800000

One further problem might be that u-boot's own memory sections (binary data, exception vector) clashes with the scenario ones. Unfortunately, mostly u-boot doesn't warn you if it fails to load the whole image due to memory clashes. Therefore, it would be good, if it's possible to you, to analyze the memory layout of the u-boot binary used on your platform, e.g.: "readelf -S <u-boot binary>"

If there's a clash you can change the "LD_TEXT_ADDR" variable in "base-hw/mk/spec-hw_imx6.mk" to another non-clashing address.

Regards Stefan

...

Thanks in advance Aditya Kousik

On Thu, Jan 2, 2014 at 4:33 PM, Stefan Kalkowski < stefan.kalkowski@...1...> wrote:

...

Hi,

On 01/02/2014 08:52 AM, Aditya Kousik wrote: > Hello all, > > We've tried to run a basic test-printf script on a Freescale i.MX6 > sabrelite board. Based on > thishttp://sourceforge.net/p/genode/mailman/message/31760885/, > we implemented the necessary files. We had also come across an i.MX6 branch > by Nikolay Golikov stating that he had a preliminary port of i.MX6

here:

...

...

> https://github.com/decaprox/genode/tree/i.mx6 > > We ran RUN_OPT="--target=uboot" make run/printf to see if it does

print

...

...

...

...

"-1 > = -1 = -1" to the serial console (tested with gtkterm). > > We ran the boot image uImage through TFTP at load address 0x10800000.

It

...

...

> loads the kernel (267.9 kB) but stops at "Loading kernel".

Assuming, your resulting kernel image is linked to 0x10001000, and

ends

...

...

...

...

at about 0x102cbc55, like the result I got when compiling Nikolay's branch, your load address for the u-boot uImage sounds reasonable. Unfortunately, I can't reproduce your experiments, because I don't

have

...

...

...

...

such a board available. The first thing that comes to my mind is, that Nikolay used another board containing the i.MX6 SoC than you with another memory layout of the related peripherals.

> > How do we know if the kernel is indeed running, or are we checking

the

...

...

...

...

> right UART ports? (we checked UART1)

First at all, you should add a printf command like:

PDBG("kernel started!")"

at the very beginning of the kernel's execution. In Nikolay's branch I would add it here:

https://github.com/decaprox/genode/blob/i.mx6/base-hw/src/core/kernel.cc#L13...

...

...

...

...

If that message isn't printed, very likely your UART definitions

aren't

...

...

...

...

correct.

> > I gave "console=ttymxc0, 115200" as bootargs in u-boot. Any

suggestions

...

...

...

...

on > how to proceed? Because we are literally stuck.

Forget about "bootargs" in u-boot. They are specific to booting the Linux kernel. U-boot puts them into the Linux/ARM specific ATAG structure. In Genode that structure isn't used. It's hard coded in the kernel, which UART is used for kernel/core debug messages. In

Nikolay's

...

...

...

...

branch, he uses the UART with memory mapped I/O located at 0x02020000, and with the following UART definition:

https://github.com/decaprox/genode/blob/i.mx6/base/include/drivers/uart/imx3...

...

...

...

...

Please check whether this corresponds with your board's definitions.

> > Also, is there a good debugging tool for testing the genode

environment

...

...

...

...

on > direct hardware?

Well, there is JTAG of course, which isn't related to Genode specifically. There are other debugging utils available on Genode,

like

...

...

...

...

GDB, but that wouldn't help on that low level you're currently working

at.

...

...

Regards Stefan

> > Thanks in advance > Aditya Kousik > > > >

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Hello,

The structure of Genode::printf is quite interesting. Running the test-printf scenario with PDBG("Hello World") works fine. It simply prints 'int main(int, char**): Hello World!'

Looking up the definition for the Genode printf in base/printf.h was not so revealing. What makes the "-1 = -1 = -1" regex special that init refuses to spawn the init->test-printf child process?

Regards Meenakshi

On Wed, Jan 29, 2014 at 11:06 AM, Aditya Kousik <adit267.kousik@...9...>wrote:

Hello all,

Genode base-hw kernel runs successfully on i.MX6. Stefan: we were looking at the wrong UART port (1 instead of 2) which led us on a wild goose chase. And we set the GPIO pins directly by setting IOMUX to GPIO mode: we lit a LED bulb successfully. The driver, as you mentioned is quite complex.

We're getting the following message for test-printf ::

Starting kernel ...

int main(): --- create local services --- int main(): --- start init --- int main(): transferred 1020 MB to init int main(): --- init created, waiting for exit condition --- [init] Could not open file "ld.lib.so" [init -> test-printf] -1 = -1 = -1 [init] virtual void Genode::Child_policy::exit(int): child exited with exit value 0

We ran nested_init to verify again and got the following::

int main(): --- create local services --- int main(): --- start init --- int main(): transferred 1021 MB to init int main(): --- init created, waiting for exit condition --- [init] Could not open file "ld.lib.so" [init] parent provides [init] service "ROM" [init] service "RAM" [init] service "CAP" [init] service "PD" [init] service "RM" [init] service "CPU" [init] service "LOG" [init] service "SIGNAL" [init] child "init" [init] RAM quota: 10223616 [init] ELF binary: init [init] priority: 0 [init -> init] Could not open file "ld.lib.so" [init -> init] parent provides [init -> init] service "ROM" [init -> init] service "RAM" [init -> init] service "CAP" [init -> init] service "PD" [init -> init] service "RM" [init -> init] service "CPU" [init -> init] service "LOG" [init -> init] service "SIGNAL" [init -> init] child "init" [init -> init] RAM quota: 4980736 [init -> init] ELF binary: init [init -> init] priority: 0 [init -> init -> init] Could not open file "ld.lib.so" [init -> init -> init] parent provides [init -> init -> init] service "ROM" [init -> init -> init] service "RAM" [init -> init -> init] service "CAP" [init -> init -> init] service "PD" [init -> init -> init] service "RM" [init -> init -> init] service "CPU" [init -> init -> init] service "LOG" [init -> init -> init] service "SIGNAL" [init -> init -> init] No children to start

One, Are these satisfactory messages? (Are the test scripts running as they should) Two, Why does test-printf not work when I try to print Genode::printf("Hello World!"); and consequently set run_genode_until "Hello World!" 10 (or {Hello World!} 10). [init -> test-printf] does not get initialized.

Regards Aditya.

On Mon, Jan 20, 2014 at 8:35 PM, Stefan Kalkowski < stefan.kalkowski@...1...> wrote:

...

Hi Meenakshi,

On 01/18/2014 09:16 AM, Meenakshi Narayanan wrote:

...

Hi Stefan,

I'm working with Aditya on the port. We're now trying to blink an LED at the start of execution of the kernel (at the place where you asked us to print a PDBG), since the JTAG is going to take a while. We've tried

using

...

i.MX53's GPIO driver by modifying the register addresses in

board_base.h.

well, I don't think this is the way to success.

Because you didn't finished to get some output from the UART, possibly because your kernel image isn't setup correctly, you're now trying to rope the far more complex GPIO driver code into the kernel? As long as things are working similar like within the i.MX53 SoC, moreover the GPIO pins depend on a correctly configured IOMUX controller, which is a ball of wires. Just to give you some complexity metric between both in form of reference manual pages, the IOMUX controller comprises 800 pages, and the UART about 80. To sum it up, setting up GPIO pins correctly is a far more error-prone task than setting up the UART on this platform.

What about my advices within the last mail, compiling your own u-boot, thereby having the ability to better check the setup of your kernel (e.g. via additional prints), and not initializing the UART within the kernel, because it's already done successfully by u-boot?

Moreover, you might start with a very easy binary (no complete Genode kernel/image), which you write from scratch. That binary can be some very simple assembler code, which only puts some character to the UART, and nothing more. If that fails too, it's probably a boot issue, which I would guess it is.

...

Basically, we need to write to the GPIO9 (GPIO1_IO09 in i.MX6) : Can

this

...

be accomplished by calling the read/write/direction functions in

driver.h

...

of os/src/driver/gpio. Or can we simply write to a register by

implementing

...

util/mmio.h?

Of course, you can use the classes in "util/mmio.h" to simply access I/O memory mapped registers. In fact, the MMIO framework is designed for that operation purpose. The code in "os/src/driver/gpio" is used for the user-level GPIO driver in Genode, and cannot be used directly within the base-hw kernel.

Regards Stefan

...

Thanks and regards Meenakshi

On Thu, Jan 9, 2014 at 3:14 PM, Stefan Kalkowski < stefan.kalkowski@...1...> wrote:

...

Hi Aditya,

On 01/09/2014 08:30 AM, Aditya Kousik wrote:

...

Hello Stefan,

I was looking for alternate methods of running the program loaded at address 10001000. That was the only motive behind trying go. I kept

using

...

...

...

bootm till then. I wasn't exactly able to check where u-boot loaded

its

...

...

own

...

memory sections. So instead, I set the load address for the kernel way above at 20000000 where I'm sure nothing else clashed. And loaded the uImage to 20800000.

I recommend using a self-compiled u-boot on you imx6 board. Therefore, you'll be able to check its memory regions.

...

While it's still stuck at 'Starting kernel...' , I'll take your

previous

...

...

...

advice seriously. To use a JTAG debugger or recheck the UART

definitions.

...

...

Moreover, you might skip the UART initialization routine. Just comment the body of the Imx31_uart_base constructor out in:

base/include/drivers/uart/imx31_uart_base.h

The UART should be initialized by u-boot anyway.

Of course, if you've a JTAG debugger present, and a corresponding connector on your test board, this probably will be the most

comfortable

...

...

path.

...

I ran test-printf on linux and this is what I got:

spawn ./core int main(): --- create local services --- int main(): --- start init --- int main(): transferred 17592186044415 MB to init int main(): --- init created, waiting for exit condition --- [init] Could not open file "ld.lib.so" Quota exceeded! amount=4096, size=4096, consumed=4096 [init] upgrading quota donation for SIGNAL session [init -> test-printf] -1 = -1 = -1 Test succeeded

Am I supposed to get similar messages from core on my board?

Yes that's right.

Regards Stefan

...

Thanks in advance Aditya

On Mon, Jan 6, 2014 at 3:28 PM, Stefan Kalkowski < stefan.kalkowski@...1...> wrote:

...

Hi Aditya,

On 01/06/2014 09:18 AM, Aditya Kousik wrote: > Hello Stefan, > > I added the print debug call inside extern "C" void kernel()

function

...

...

as

...

...

> you'd suggested. Still no response from the processor. > > I checked the address specifications in both Imx31_uart_base.h and

also

...

...

...

...

> base/include/platform/imx6/board_base.h in Nikolay's branch. They

are

...

...

...

...

> correct, to the dot. Even AIPS mapping in board.h in base-hw's core.

The

...

...

> definitions seem to be fine. > > Ideally, what is expected to happen, i.e, the expected course of

action?

...

...

we > can't load the kernel by running 'bootm' since you say it uses a different > config. So what do we do with the uImage?

Well, I can't follow your conclusions to not using bootm? You've a complete scenario packed into an ELF image, which is built to be

loaded

...

...

...

...

at start address 0x10001000. This ELF image is used by u-boot's

mkimage

...

...

...

...

utility to form a uImage file. This uImage can be loaded to some

address

...

...

...

...

above 0x10300000 e.g. via TFTP like you did it. Assuming you've loaded the uImage to 0x10800000, you should boot the scenario with "bootm 0x10800000". After that u-boot will interpret

the

...

...

...

...

uImage header at that address, load the ELF image within the uImage

to

...

...

...

...

the appropriated memory sections, prepare the machine registers, and finally jump to 0x10001000.

> > 1. I loaded the uImage to 0x10800000 with TFTP as 'tftp 10800000'.

It

...

...

...

...

> succesfully loaded the kernel to that address. At this point, I had changed > the load address to 10002000 to check if the image was read

properly.

...

...

It

...

...

> did. > 2. As a different approach, ran 'go 10002000'. This was what I got > "##Application > started at 0x10002000, Application terminated, rc = 0x100A4004"

Using the 'go XXX' command let u-boot simply load that address into

the

...

...

...

...

ip register. As you've loaded an uImage to the related address, the machine executes the u-boot image header information, which of course fails. Even if you load the ELF image by hand to the appropriated

memory

...

...

...

...

sections, it is not recommended to use the 'go' command, as u-boot doesn't prepare the machine as expected. For instance, the kernel

gets

...

...

...

...

executed with the MMU enabled using u-boot's page-table setup etc.

> > What is the sequence of events, the programs that are sequentially executed > to say that the kernel is 'running'?

In your case I assume:

tftp 0x10800000 <network path to uImage> bootm 0x10800000

One further problem might be that u-boot's own memory sections

(binary

...

...

...

...

data, exception vector) clashes with the scenario ones.

Unfortunately,

...

...

...

...

mostly u-boot doesn't warn you if it fails to load the whole image

due

...

...

...

...

to memory clashes. Therefore, it would be good, if it's possible to

you,

...

...

...

...

to analyze the memory layout of the u-boot binary used on your

platform,

...

...

...

...

e.g.: "readelf -S <u-boot binary>"

If there's a clash you can change the "LD_TEXT_ADDR" variable in "base-hw/mk/spec-hw_imx6.mk" to another non-clashing address.

Regards Stefan

> > Thanks in advance > Aditya Kousik > > > On Thu, Jan 2, 2014 at 4:33 PM, Stefan Kalkowski < > stefan.kalkowski@...1...> wrote: > >> Hi, >> >> On 01/02/2014 08:52 AM, Aditya Kousik wrote: >>> Hello all, >>> >>> We've tried to run a basic test-printf script on a Freescale i.MX6 >>> sabrelite board. Based on >>> thishttp://sourceforge.net/p/genode/mailman/message/31760885/, >>> we implemented the necessary files. We had also come across an

i.MX6

...

...

...

...

>> branch >>> by Nikolay Golikov stating that he had a preliminary port of i.MX6 here: >>> https://github.com/decaprox/genode/tree/i.mx6 >>> >>> We ran RUN_OPT="--target=uboot" make run/printf to see if it does

print

...

...

>> "-1 >>> = -1 = -1" to the serial console (tested with gtkterm). >>> >>> We ran the boot image uImage through TFTP at load address

0x10800000.

...

...

...

...

It >>> loads the kernel (267.9 kB) but stops at "Loading kernel". >> >> Assuming, your resulting kernel image is linked to 0x10001000, and

ends

...

...

>> at about 0x102cbc55, like the result I got when compiling Nikolay's >> branch, your load address for the u-boot uImage sounds reasonable. >> Unfortunately, I can't reproduce your experiments, because I don't

have

...

...

>> such a board available. The first thing that comes to my mind is,

that

...

...

...

...

>> Nikolay used another board containing the i.MX6 SoC than you with >> another memory layout of the related peripherals. >> >>> >>> How do we know if the kernel is indeed running, or are we checking

the

...

...

>>> right UART ports? (we checked UART1) >> >> First at all, you should add a printf command like: >> >> PDBG("kernel started!")" >> >> at the very beginning of the kernel's execution. In Nikolay's

branch I

...

...

...

...

>> would add it here: >> >> >> >>

https://github.com/decaprox/genode/blob/i.mx6/base-hw/src/core/kernel.cc#L13...

...

...

...

...

>> >> If that message isn't printed, very likely your UART definitions

aren't

...

...

>> correct. >> >>> >>> I gave "console=ttymxc0, 115200" as bootargs in u-boot. Any

suggestions

...

...

>> on >>> how to proceed? Because we are literally stuck. >> >> Forget about "bootargs" in u-boot. They are specific to booting the >> Linux kernel. U-boot puts them into the Linux/ARM specific ATAG >> structure. In Genode that structure isn't used. It's hard coded in

the

...

...

...

...

>> kernel, which UART is used for kernel/core debug messages. In

Nikolay's

...

...

>> branch, he uses the UART with memory mapped I/O located at

0x02020000,

...

...

...

...

>> and with the following UART definition: >> >> >> >>

https://github.com/decaprox/genode/blob/i.mx6/base/include/drivers/uart/imx3...

...

...

...

...

>> >> Please check whether this corresponds with your board's

definitions.

...

...

...

...

>> >>> >>> Also, is there a good debugging tool for testing the genode

environment

...

...

>> on >>> direct hardware? >> >> Well, there is JTAG of course, which isn't related to Genode >> specifically. There are other debugging utils available on Genode,

like

...

...

>> GDB, but that wouldn't help on that low level you're currently

working

...

...

...

...

at. >> >> Regards >> Stefan >> >>> >>> Thanks in advance >>> Aditya Kousik >>> >>> >>> >>> >>

---

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...

...

...

>>> Rapidly troubleshoot problems before they affect your business.

Most

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...

IT

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>>> organizations don't have a clear picture of how application

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>>> affects their revenue. With AppDynamics, you get 100% visibility

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>>> >>> >>> >>> _______________________________________________ >>> Genode-main mailing list >>> Genode-main@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/genode-main >>> >> >> -- >> Stefan Kalkowski >> Genode Labs >> >> http://www.genode-labs.com/ · http://genode.org/ >> >> >>

---

...

...

...

...

>> Rapidly troubleshoot problems before they affect your business.

Most

...

...

IT

...

...

>> organizations don't have a clear picture of how application

performance

...

...

>> affects their revenue. With AppDynamics, you get 100% visibility

into

...

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...

...

your >> Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics >> Pro! >>

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>> _______________________________________________ >> Genode-main mailing list >> Genode-main@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/genode-main >> > > > >

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> Rapidly troubleshoot problems before they affect your business.

Most IT

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...

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> organizations don't have a clear picture of how application

performance

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> affects their revenue. With AppDynamics, you get 100% visibility

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> > > > _______________________________________________ > Genode-main mailing list > Genode-main@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/genode-main >

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Rapidly troubleshoot problems before they affect your business. Most

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organizations don't have a clear picture of how application

performance

...

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affects their revenue. With AppDynamics, you get 100% visibility into

your

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Java,.NET, & PHP application. Start your 15-day FREE TRIAL of

AppDynamics

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Hi Martin,

You were right. Adding a line break fixed it. Who would have thought? :-)

Great. We can proceed from here. Thank you for bearing with us.

Regards Aditya

On Wed, Jan 29, 2014 at 5:00 PM, Martin Stein <martin.stein@...1...>wrote:

Hi Aditya

On 29.01.2014 06:36, Aditya Kousik wrote:

Hello all,

Genode base-hw kernel runs successfully on i.MX6. Stefan: we were looking at the wrong UART port (1 instead of 2) which led us on a wild goose chase. And we set the GPIO pins directly by setting IOMUX to GPIO mode: we lit a LED bulb successfully. The driver, as you mentioned is quite complex.

We're getting the following message for test-printf ::

Starting kernel ...

int main(): --- create local services --- int main(): --- start init --- int main(): transferred 1020 MB to init int main(): --- init created, waiting for exit condition --- [init] Could not open file "ld.lib.so" [init -> test-printf] -1 = -1 = -1 [init] virtual void Genode::Child_policy::exit(int): child exited with exit value 0

We ran nested_init to verify again and got the following::

int main(): --- create local services --- int main(): --- start init --- int main(): transferred 1021 MB to init int main(): --- init created, waiting for exit condition --- [init] Could not open file "ld.lib.so" [init] parent provides [init] service "ROM" [init] service "RAM" [init] service "CAP" [init] service "PD" [init] service "RM" [init] service "CPU" [init] service "LOG" [init] service "SIGNAL" [init] child "init" [init] RAM quota: 10223616 [init] ELF binary: init [init] priority: 0 [init -> init] Could not open file "ld.lib.so" [init -> init] parent provides [init -> init] service "ROM" [init -> init] service "RAM" [init -> init] service "CAP" [init -> init] service "PD" [init -> init] service "RM" [init -> init] service "CPU" [init -> init] service "LOG" [init -> init] service "SIGNAL" [init -> init] child "init" [init -> init] RAM quota: 4980736 [init -> init] ELF binary: init [init -> init] priority: 0 [init -> init -> init] Could not open file "ld.lib.so" [init -> init -> init] parent provides [init -> init -> init] service "ROM" [init -> init -> init] service "RAM" [init -> init -> init] service "CAP" [init -> init -> init] service "PD" [init -> init -> init] service "RM" [init -> init -> init] service "CPU" [init -> init -> init] service "LOG" [init -> init -> init] service "SIGNAL" [init -> init -> init] No children to start

One, Are these satisfactory messages? (Are the test scripts running as they should) Two, Why does test-printf not work when I try to print Genode::printf("Hello World!"); and consequently set run_genode_until "Hello World!" 10 (or {Hello World!} 10). [init -> test-printf] does not get initialized.

Regards Aditya.

The output of your run/printf and run/nested_init looks fine. I assume you're getting no output with Genode::printf("Hello World!"); because Genode buffers print jobs until a line-break comes in, to save RPCs. Could please try Genode::printf("Hello World!\n"); ?

Best regards, Martin

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