linux-kernel - RE: [BUG] panda board locks up on boot

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Date:	Mon, 28 Jan 2013 09:59:47 +0000
From:	Mats Liljegren <mats.liljegren@...a.com>
To:	Nishanth Menon <menon.nishanth@...il.com>,
	Paolo Pisati <p.pisati@...il.com>
CC:	Tony Lindgren <tony@...mide.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Igor Grinberg <grinberg@...pulab.co.il>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Venkatraman S <svenkatr@...com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-omap <linux-omap@...r.kernel.org>
Subject: RE: [BUG] panda board locks up on boot

> From: Nishanth Menon [mailto:menon.nishanth@...il.com]
> 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@...r.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

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

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