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Date:	Mon, 25 May 2009 23:05:27 +0400
From:	Sergei Shtylyov <sshtylyov@ru.mvista.com>
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To:	Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
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Subject: Re: [loongson-PATCH-v1 24/27] fixup for FUJITSU disk
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Bartlomiej Zolnierkiewicz wrote:

>>yanh 写道:

> [...]

>>>the cs5536 pata driver have some geode platform dependent codes. We can
>>>just ignore it, but the performance is poor(using hdparm to test it),
>>>which only get 22+ MB/s. we find it only use udma2. However if using
>>>amd74xx driver, it can set udma5, and the speed can reach to 50+ MB/s. 

>>>we will test whether this driver is working well without this patch.

>>>Anyway, thanks your advice.

>>Use the driver drivers/ata/pata_cs5536.c, unfortunately it also have the 
>>same issue.

> Both drivers (pata_cs5536 & cs5536) should handle UDMA5.

> Could you please explain the issue with platform specific code a bit more?

> Is it related to a cable detection by any chance?

    I guess it's rdmsr()/wrmsr()...

> Thanks.
> Bart

MBR, Sergei