Raspberry Pi B+ with uboot and genode

[Stefan Kalkowski]

Hi Bernhard,

On 05/10/2017 07:24 PM, Bernhard Blieninger wrote:
> Hi,
> 
> 
> I am currently working to get the raspberry pi b+ working with genode.
> I started with an raspberry pi uboot and a tftp server where genode.img
> lies on.
> The sd card was flashed via dd and the sd card image from here:
> http://wiki.beyondlogic.org/index.php?title=Compiling_uBoot_RaspberryPi
> 
> For the genode image I used the newest version of genode on github and
> compiled a foc_rpi and an rpi with this command:
> 
> ./tool/create_builddir foc_rpi  BUILD_DIR=buildrpi
> 
> or that
> 
>   ./tool/create_builddir rpi BUILD_DIR=./build-rpi
> 
> and the command
> 
>  make run/demo
> 
> This is working with the Raspberry Pi B(!) but when i put the sd card in
> the Raspberry Pi B +(!) it is not even booting.
> 
> Therefore i prepared a sd card with raspbian and changed the kernel.img
> with the newly compiled u-boot.bin from     http://git.denx.de/u-boot.git
> The sd card now boots again and shows u-boot but if I want to load
> genode.img it does not continue.
> If genode is loaded, for example by manually triggering it with bootz,
> the serial connected minicom screen shows encoding problem nonsense.
> Starting up a linux kernel works. If I start genode.img directly from
> the sd card it is not working either.
> 
> If I try this sd card with the Raspberry Pi B(!) it is not working.
> What I have tested in a last step is, what happens  if I substitute the
> u-boot.bin with the genode.img while using the sd card image that was
> provided by beyondlogic in the first place, this is working for the B
> model but not for the B +.
> Also tried a fresh sd card format it to fat16 and put all the stuff on
> it, which is in the boot folder from
> https://github.com/raspberrypi/firmware , but that is also not working.
> 
> So I assume, that either the bootcode.bin and/or start.elf  provided by
> raspberry are too new to use them with genode.
> I could maybe find older versions but I would just like to ask if this
> will help, maybe genode was never (meant to) run with some raspberry
> boot code that is newer then 2013.11
> (http://genode.org/documentation/release-notes/13.11#Raspberry_Pi).
> 
> Thanks in Advance for your help.

I do not think its a "firmware is too new" issue. I guess it is more a
question of how is the firmware configured, and what are the actual
differences in between Model 1 B and 1 B+.
The first question is, what exactly is not working. If everything stays
blank after u-boot started the kernel, then probably Genode does not use
the right physical address for the UART's memory mapped I/O registers,
either because they've changed in between both board revisions, or
because the firmware is configured in a different way than before resp.
configures the GPIO pins to connect to a different (serial) device. In
that case, you might study the options in config.txt for your specific
model. Alternatively, you might somehow find out which UART and base
address Linux is using on the device, e.g. in /proc/iomem.

Unfortunately, I do not have such device, and therefore cannot reproduce
that problem.

Regards
Stefan


> 
> 
> 
> Best Regards,
> 
> Bernhard.
> 
> 
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-- 
Stefan Kalkowski
Genode Labs

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