2013/8/25 Alexander Tarasikov <alexander.tarasikov@...9...>

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

Also you can look at https://github.com/decaprox/genode/tree/am33xx

Add "uboot" string to etc/specs.conf file in your build directory for build uimage

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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