[U-Boot] /proc/cpuinfo Revision field is 0000 on raspberry pi after booting with u-boot

[Christian Erhardt]

Hello,

just wanted to let you know, that i found the reason, why this is not 
working:

The raspberry pi passes the revision, serial number, mac address as 
parameters to the kernel during boot. When i start via u-boot, u-boot 
receives this parameters and does not pass them to the kernel. Thats why 
the revision field is empty.

Is there any way to pass parameters given to u-boot on to the kernel?

Regards

Christian


On 09.12.2014 14:01, Christian Erhardt wrote:
> Hello,
>
> i'm upcycling an old stereo amplifier and using an raspberry pi to do 
> this. Since i didn't want to unscrew the cover everytime i want to do 
> an update, i thought booting with u-boot from a secondary partition 
> would be a good idea. I'm using buildroot to create a customized 
> kernel / system (default raspberry 3.12.y with minor adjustments for 
> my wifi card).
>
> The kernel boots fine and the system is working. The issue is, that 
> when i do a 'cat /proc/cpuinfo' the Revision field is set to 0000. 
> When i boot the kernel directly, without u-boot, it reports 000e.
>
> The problem is, that the python gpio library is checking this revision 
> field to determine the right configuration. So the gpio stuff is not 
> working an complaining that my board is not a raspberry pi.
>
> It seems to me, that this issue is related to u-boot, but i have no 
> clue why this is happening and what i can do about it.
>
> If i can provide any more information, let me know.
>
> Regards
>
> Christian
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