> From: Nishanth Menon [mailto:menon.nishanth@xxxxxxxxx] > Sent: den 27 januari 2013 15:34 > To: Paolo Pisati > Cc: Mats Liljegren; Tony Lindgren; LKML; Steven Rostedt; Igor Grinberg; > Russell King; Venkatraman S; linux-arm-kernel; linux-omap > 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@xxxxxxxxxxxxxxx/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 Thanks for the suggestion. Unfortunately it didn't make any difference for me, neither did an upgrade to 3.8-rc5. I guess I have to wait for the TPS support to hit mainline kernel. Regards Mats -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
