Re: [PATCH] sata_mv: Fix broken Marvell 7042 support.

[Hein-Pieter van Braam <hp@syntomax.com>]

On Mon, 2007-12-03 at 23:10 +0000, Alan Cox wrote:
> On Mon, 03 Dec 2007 23:48:44 +0100
> Hein-Pieter van Braam <hp@syntomax.com> wrote:
> 
> > > Man, what a quirky BIOS!
> > 
> > Hum... I can pvcreate on the md device just fine, but after that, pvscan
> > won't find it... 
> > 
> > I have a suspicion that there's a BIOS doing some sector hiding or
> > replacement of sorts... 
> > 
> > *facepalm*
> 
> That would make sense. However we have weapons to make it surrender. See
> the "dmraid" tool - you should be able to use that as an example of how
> to set up device mapper mapped linear mappings to "unshift" partitions.
> 
> Alan

I did some testing:
First I zero'd the first 80 meg of the md device, then read it back and
compared, still all zero's. Then I rebooted and compared again, still
all zero's

Then I got 8MB of stuff from /dev/urandom, wrote it to a file then wrote
it to md device, read it back into a separate file, they still matched.
I rebooted and read it back for a third time, and they still matched.

I'm not sure if this means anything or not, but I was wondering if my
assertion of BIOS muckery still made sense 

HP


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