On 08/25/2013 01:56 PM, Alexander Tarasikov wrote:
On Sun, Aug 25, 2013 at 8:18 PM, Bob Stewart <[email protected]
<mailto:[email protected]>> 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
<http://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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Thanks for the reply Alexander. I'll build it with the u-boot in
spec.conf and try loading the uImage. "bootelf" on the loadaddr
resulted in a data abort crash.
Bob
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