linux-kernel - Re: 2.6.24-rc8 hangs at mfgpt-timer

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Message-ID: <20080121232709.GJ10837@cosmic.amd.com>
Date:	Mon, 21 Jan 2008 16:27:09 -0700
From:	"Jordan Crouse" <jordan.crouse@....com>
To:	"Arnd Hannemann" <hannemann@...informatik.rwth-aachen.de>
cc:	"Andres Salomon" <dilinger@...ued.net>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.24-rc8 hangs at mfgpt-timer

Okay - I've been exploring a little bit more.  I talked to the TinyBIOS
developer, and he verified that TinyBIOS shouldn't use any MFGPT timers.
He also told me that the mysterious "MFGPT workaround" was in fact the 
magic MFGPT erasing MSR that was in the old kernel driver.

So with the "MFGPT workaround" turned off, TinyBIOS should be acting like
the OLPC firmware with regards to timers, yet it is not.  So that is 
curious.  I think I might have identified a race condition in the code,
but I'm not 100% sure thats the same problem that the ALIX platform is
seeing.

Anrd and others - will you please try the attached patch on your platform
with the "MFGPT workaround" turned off and mfgpts enabled, and send out
the dmesg?

This will give us some debug information that I can use to ensure that
the interrupts are set up correctly.  You can leave the timer tick disabled
if you want.

Thanks,
Jordan

-- 
Jordan Crouse
Systems Software Development Engineer 
Advanced Micro Devices, Inc.

View attachment "mfgpt-debug-spew.patch" of type "text/plain" (974 bytes)