linux-kernel - Re: CS5536 mfgpt timer setup register hangs board

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Date:	Fri, 25 Jan 2008 17:00:52 -0700
From:	"Jordan Crouse" <jordan.crouse@....com>
To:	"Hasan Rashid" <hasan@...italpath.net>
cc:	linux-kernel@...r.kernel.org
Subject: Re: CS5536 mfgpt timer setup register hangs board

On 25/01/08 15:50 -0800, Hasan Rashid wrote:
> 
> Hi,
> 
> I have been working on a watchdog timer using the mfgpt on AMD Geode
> CS5536. I initialize the setup register MFGPT0_SETUP (0x6206) with hex
> value 0x306 (1100000110b). However, after this first initialization if I
> ever read/write to the register it hangs the system.
> 
> I have been through all the documentation, tried several different methods
> but all the efforts, frustratingly, to no avail.
> 
> Does anyone have any idea as to why would this be? TIA!

It looks like you are using TinyBIOS.  Make sure that if you are using v0.99
that you do *not* enable the MFGPT workaround.  If you are using an older 
version, then you will need this patch:

http://lkml.org/lkml/2008/1/23/372

And enable mfgptfix on the command line.  There seems to be a problem with
the MFGPT "workaround" that causes hangs exactly like you are seeing.

Jordan

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


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