From: Mats Liljegren <mats.liljegren@enea.com>
To: Nishanth Menon <menon.nishanth@gmail.com>,
Paolo Pisati <p.pisati@gmail.com>
Cc: Tony Lindgren <tony@atomide.com>,
LKML <linux-kernel@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Igor Grinberg <grinberg@compulab.co.il>,
Russell King <rmk+kernel@arm.linux.org.uk>,
Venkatraman S <svenkatr@ti.com>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
linux-omap <linux-omap@vger.kernel.org>
Subject: RE: [BUG] panda board locks up on boot
Date: Mon, 28 Jan 2013 09:59:47 +0000 [thread overview]
Message-ID: <0247700D01F14443B9209F90AD938CC524099EA3@sestoex09.enea.se> (raw)
In-Reply-To: <51053AD2.8080805@gmail.com>
> From: Nishanth Menon [mailto:menon.nishanth@gmail.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@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
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
next prev parent reply other threads:[~2013-01-28 9:59 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-25 3:01 [BUG] panda board locks up on boot Steven Rostedt
2013-01-25 7:10 ` Igor Grinberg
2013-01-25 8:43 ` Mats Liljegren
2013-01-25 13:07 ` Steven Rostedt
2013-01-27 14:12 ` Paolo Pisati
2013-01-27 14:33 ` Nishanth Menon
2013-01-28 9:59 ` Mats Liljegren [this message]
2013-01-25 12:54 ` Steven Rostedt
2013-01-25 8:52 ` Russell King - ARM Linux
2013-01-25 13:50 ` Steven Rostedt
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