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

[yanh]

在 2009-05-25一的 15:10 -0400，Martin K. Petersen写道：
> >>>>> "Sergei" == Sergei Shtylyov <address@hidden> 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.