Re: FUA and 311x (was Re: LibPATA code issues / 2.6.15.4)

[Jens Axboe]

On Wed, Mar 01 2006, Jeff Garzik wrote:
> Jeff Garzik wrote:
> >For libata, I think an ATA_FLAG_NO_FUA would be appropriate for 
> >situations like this...  assume FUA is supported in the controller, and 
> >set a flag where it is not.  Most chips will support FUA, either by 
> >design or by sheer luck.  The ones that do not support FUA are the 
> >controllers that snoop the ATA command opcode, and internally choose the 
> >protocol based on that opcode.  For such hardware, unknown opcodes will 
> >inevitably cause problems.
> 
> This also begs the question... what controller was being used, when the 
> single Maxtor device listed in the blacklist was added?  Perhaps it was 
> a problem with the controller, not the device.

Yeah which explains it a lot better as well... The FUA drive problem
never made much sense to me.

-- 
Jens Axboe

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