Boot problems using Genode 16.08 with Fiasco.OC r67 on a RPi Model B

[Stefan Kalkowski]

Hi Alexander,

On 07/06/2017 03:10 PM, Alexander Weidinger wrote:
> Hello,
> 
> I was finally able to get the RPi to boot completely by adding the
> following lines from foc r72:
> https://github.com/skalk/foc/blob/r72/l4/pkg/bootstrap/server/src/platform_common.cc#L47-L49
> 
> What still seems odd to me is, that when I'm using genode.img I can use
> the kernel_addr_r address (0x01000000) stored in u-boot to successfully
> boot the RPi.
> For the image.elf I have to use a different address - something like
> 0x8000 - otherwise the RPi just resets itself.

I'm not sure whether I understand you correctly. When using Genode 16.08
I do not get a "genode.img" file out of the build process.

I assume that your genode.img is equivalent to the uImage file built
when enabling the u-boot run-tool plugin?
Given that in u-boot you are loading the OS via "bootm XXX" you have to
use an u-boot compliant image and not an ELF file. When using an u-boot
image, u-boot copies everything (except the header) to the physical
address given in the u-boot image header, and then jumps to the
entrypoint address given by the same header. In contrast, when using an
ELF file, you have to use the "bootelf" command within the u-boot
commandline.
Anyway, the u-boot image is generated by our run-tool (when enabled via
RUN_OPT) out of the image.elf file. Thereby, the used memory areas after
the process of loading by u-boot, should be the same. The loading itself
should succeed, as long as you are using the memory area to hand over
the image to u-boot (either ELF or u-boot image)

Regards
Stefan

> 
> Some insight on this would be very helpful!
> 
> Regards,
> Alexander
> 
> On 2017-07-05 18:09, Alexander Weidinger wrote:
>> Dear Genode community,
>>
>> we are currently trying to get a Raspberry Pi 1 Model B running with
>> Genode 16.08 and Fiasco.OC r67 from https://github.com/skalk/foc/.
>>
>> We made changes to both, genode and foc but the basis are the two
>> mentioned versions.
>>
>> Trying to boot the RPi, we are left with the following message, the
>> board resets itself? and again tries to boot:
>>> ...
>>> reading genode.img
>>> 2060288 bytes read in 331 ms (5.9 MiB/s)
>>> Kernel image @ 0x1000000 [ 0x1000000 - 0x11f7000 ]
>>>
>>> Starting k
>>> L4 Bootstrapper
>>>   Build: #5 Wed Jul  5 17:34:36 CEST 2017, 4.9.2
>>>   Scanning up to 512 MB RAM, starting at offset 32MB
>>>
>>>
>>> U-Boot 2014.07-rc3-gd4614d4 (Jun 14 2014 - 01:23:23)
>>> ...
>> (Trying to boot vanilla genode 16.08 with vanilla foc r67 (from skalk)
>> leads to the same behavior.)
>>
>> We were successful in running our setup (foc r67 and genode 16.08 both
>> with our changes) on a pandaboard (real hardware) and on pbxa9 (qemu).
>> Additionally we are able to successfully boot the RPi using vanilla
>> genode 16.08 with the provided foc version (r56), using our u-boot
>> configuration.
>>
>> Do we need to make additional changes to foc and/or genode to be able to
>> boot the RPi using r67 of foc?
>> Any hints or information are very welcomed!
>>
>> Regards,
>> Alexander
>>
>>
>>
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>>
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> 
> 
> 
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> 
> 
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-- 
Stefan Kalkowski
Genode Labs

https://github.com/skalk · http://genode.org/

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