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Re: [loongson-PATCH-v1 24/27] fixup for FUJITSU disk

To: Bartlomiej Zolnierkiewicz <>
Subject: Re: [loongson-PATCH-v1 24/27] fixup for FUJITSU disk
From: Sergei Shtylyov <>
Date: Mon, 25 May 2009 23:05:27 +0400
Cc: 胡洪兵 <>,,,, Ralf Baechle <>, IDE/ATA development list <>, Linux Kernel <>, linux-scsi <>, Philippe Vachon <>, Zhang Le <>, Zhang Fuxin <>, Arnaud Patard <>,,, Nicholas Mc Guire <>, Liu Junliang <>, Erwan Lerale <>
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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()...


MBR, Sergei

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