Re: Assorted bugs in the PIIX drivers

[Marc Koschewski]

* Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> [2005-11-25 14:43:28 +0000]:

> I finally got all the documents rounded up to try and redo Jgarzik's
> PIIX driver a bit more completely (I'm short MPIIX if anyone has it ?)
> 
> I then started reading the docs and the code and noticing a couple of
> problems
> 
> 1.	We set IE1 on PIO0-2 which the docs say is for PIO3+
> 
> 2.	The ata_piix one (but not the ide/pci one) have shifts wrong so that
> the secondary slave timings are half loaded into the primary slave
> 
> 
> I'm also not clear if the "no MWDMA0" list has been updated correctly
> for the newer chipsets.
> 
> I've yet to review the DMA programming, just the PIO so far.

Alan,

	could it be possible to again drop the ide=nodma kernel parameter in my
configs that use reiserfs? reiserfs just bails out when I mount devices on ide
busses that miss that parameter. I somtimes had to --rebuild-tree after a boot
with DMA enabled.

Regards,
	Marc
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