ATA/DMA problem after reboot

[Jeremie Le Hen]

Hi Andrzej, Pertti,

> > I tried to disable APIC, S.M.A.R.T, IDE DMA Burst, IDE Block Mode.
> > I don't know what the last one does, but anyway, nothing corrected
> > my problem.
> > 
> > Other suggestions are welcome.
> 
> In my case switching from UDMA33 to WDMA solves the problem,
> but almost halves disk bandwidth (from 28M/s to 18M/s)
> (via # atacontrol mode ad0)
> 
> It seems that there is som nasty timing bug in ATA or system
> so only big bulk transfer are affected

How do I set this at boot time ?  There may be a tunable or something
allowing to do this.  My problem indeed occurs before / is even
mounted.

Regards,
-- 
Jeremie Le Hen
< jeremie at le-hen dot org >< ttz at chchile dot org >