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

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Date:	Fri, 25 Jan 2008 16:17:00 -0800 (PST)
From:	"Hasan Rashid" <hasan@...italpath.net>
To:	linux-kernel@...r.kernel.org
Cc:	"Hasan Rashid" <hasan@...italpath.net>
Subject: Re: CS5536 mfgpt timer setup register hangs board

This is what TinyBios posts
-------------------------------------------
PC Engines ALIX.2 v0.99
640 KB Base Memory
130048 KB Extended Memory

01F0 Master 848A CF 128MB
Phys C/H/S 1002/8/32 Log C/H/S 1002/8/32

BIOS setup:

(9) 9600 baud (2) 19200 baud *3* 38400 baud (5) 57600 baud (1) 115200 baud
*C* CHS mode (L) LBA mode (W) HDD wait (V) HDD slave (U) UDMA enable
(M) MFGPT workaround
(P) late PCI init
*R* Serial console enable
(E) PXE boot enable
(X) Xmodem upload
(Q) Quit

The MFGPT workaround is disabled, and I deleted the workaround code that
came with voyage linux's distribution. Anyhow I will try the fix and see
if that solves my problem.

> 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.
>
>
>


-- 
Regards,
Hasan Rashid


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