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Subject: Re: [loongson-PATCH-v1 24/27] fixup for FUJITSU disk
From: yanh <yanh@lemote.com>
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To: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>,
       Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>,
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Date: Tue, 26 May 2009 09:21:30 +0800
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在 2009-05-25一的 15:10 -0400，Martin K. Petersen写道：
> >>>>> "Sergei" == Sergei Shtylyov <sshtylyov@ru.mvista.com> writes:
> 
> >> Could you please explain the issue with platform specific code a bit
> >> more?
> 
> >> Is it related to a cable detection by any chance?
> 
> Sergei>    I guess it's rdmsr()/wrmsr()...
currently, we just commented out the rdmsr/wrmsr.
and we use pci VSA to access it. 
> 
> Those are only used when the driver is explicitly loaded with
> use_msr=1.  The default is to use PCI config space/VSA.
> 
> In any case I have yet to see a CS5536 system whose BIOS sets the cable
> detection bit.  If that's the problem I guess we could add a quirk flag
> to override the (lack of) BIOS setting.
> 
This may be the cause that udma5 cannot be set.