Messages in this thread | | | Date | Sun, 27 Jan 2013 08:33:54 -0600 | From | Nishanth Menon <> | Subject | Re: [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" > > http://www.mail-archive.com/linux-omap@vger.kernel.org/msg83693.html >
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.
--- Regards, NM
| |