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SubjectRe: [BUG] panda board locks up on boot
On 01/27/2013 08:12 AM, Paolo Pisati wrote:
> On Fri, Jan 25, 2013 at 08:43:15AM +0000, Mats Liljegren wrote:
>> Hi Steven,
>> Do you have CONFIG_CPU_FREQ enabled? As I posted earlier in linux-kernel forum ("Failed booting PandaBoard ES with Linux 3.8 RC4" two days ago) my PandaBoard ES hangs while booting with this option enabled. It works fine without it. I have not bisected it down to a single commit though.
> glad i'm not the only one who hit this problem:
> "3.8rc4+ and cpu_freq omap: hangs, oopses, etcetc"

Support for TPS is not yet in mainline kernel. you may want to do:

you could try running 'mw.w 0x4A31E05A 0x1' before bootm in u-boot ->
This will hack the pad of panda ES pin mean for controlling TPS voltage
register (again a kernel bug where the GPIO block setup by bootloader
got reset).

CPUfreq needs both voltage and frequency scaling to work and without
support of the TPS voltage scaling on vdd_MPU, you are stuck at boot
voltage, and just scaling frequency. with the not-enough boot voltage,
moving to higher frequencies can/will result in unpredictable behavior.


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