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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