Re: libATA PATA status report, new patch

From: Alan Cox
Date: Fri Feb 10 2006 - 10:42:09 EST

On Gwe, 2006-02-10 at 13:01 +0100, Erik Mouw wrote:
> Alan, can this related to LBA48 compatibility? I remember having
> problems with this when Andre Hedrick added LBA48 support around
> linux-2.4.19. The drive (Maxtor 4D040H2) advertised it supported LBA48,
> but the chipset (Ali 1543 rev C3, IIRC) didn't.

I don't think so. There is code to handle it. More likely the tuning
code is wrong and loaded incorrect values. We identify at PIO0 then
select modes.

Best way to test:

Boot with mwdma/udma set to zero in "info" block


Boot with only pio 0 claimed as supported and the mode setting logic
commented out.

That gives a good idea what broke.

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