Bringing up Genode run/nested_init on a Beaglebone.

[Alexander Tarasikov]

On Sun, Aug 25, 2013 at 8:18 PM, Bob Stewart <robjsstewart at ...196...>wrote:

>  I'm try to get a basic Genode setup working on a Beaglebone Black (TI
> AM335x processor). I'm using a version of u-boot specifically built for the
> Beaglebone Black from Robert Nelson's eewiki pages. The only modification I
> made was to allow for elf file commands.
>

I would suggest taking a look at github.com/ksys-labs, we should have a
tree that supports Omap3


>
> Carefully following how the PandaBoard and the imx53 platforms were build
> I successfully built from base-hw an elf image for run/nested_init and
> loaded that onto an SDCard which contained the two stages of u-boot.
> (Previously, I had succesfuly built a helloworld test version of Fiasco.OC
> and successfully manually booted it from an SDCard with the same MLO and
> u-boot.img files. So the basic process of booting an elf image file works.)
>
> The elf image is built to load and 0x81000000 with u-boot using the space
> from start of SDRAM at 0x80000000. The elf file header has an entry point
> address of 0x81004DC0.
> Booting the Beagleboard into u-boot from the SDCard, manually loading the
> elf image file to the load address above, and giving it a"go" command to
> the entry point address, I get an "application terminated" message as shown
> below in the console output through minicom:
> .
>

I would suppose you are expected to do a "bootelf 0x81000000" to let u-boot
properly align the ELF sections. Otherwise, it should be possible to add
the "u-boot" to build.conf flags to build an uImage. Either way, what I did
was to take the image.bin.gz, ungzip it and substract 0x8000 bytes from the
address. So, I loaded it to the address "0x80ff8000". Then, you can either
"go" or "bootz" (if your u-boot supports it).
Take a look around here for details
http://allsoftwaresucks.blogspot.ru/2013/05/porting-genode-to-commercial-hardware.html


> .
> .
> *U-Boot# load mmc 0 0x81000000 image.elf**
> **reading image.elf**
> **604700 bytes read in 73 ms (7.9 MiB/s)**
> **U-Boot# go 0x81004dc0**
> **## Starting application at 0x81004DC0 ...**
> **## Application terminated, rc = 0x8108C004**
> **U-Boot# *
>
> At termination, the output above shows rc to be pointed at 4 bytes beyond
> the start of the bss section of the image.
>
> I would have expected to see at least some Genode core debugging messages,
> at least. Is core not being executed at the entry point?
>
> I believe I have the Board_base stucture and cores cpu, pic,
> platform_support, timer and tlb files correctly set up for the AM335x.
>
> Thank you for any help you can provide.
>
>     Bob Stewart
>
>
>
>
>
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-- 
Regards, Alexander
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