On 08/25/2013 02:15 PM, Nikolay Golikov wrote:
2013/8/25 Alexander Tarasikov <[email protected]
<mailto:[email protected]>>
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
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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Thanks for the reply, Nikolay. I appreciate the link to the am33xx
tree. I try the uImage and see if that works. I better try to
understand what that 0x8000 offset adjustment Alexander mentioned is
doing as I do see why the bootelf won't work.
Bob.
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