[clue-tech] 2.6.18 (CentOS 5.x) kernel initialize IDE drives in UDMA2 mode?

[Angelo Bertolli]

David L. Anselmi wrote:
> Jim Ockers wrote:
>> I think that trying to set the DMA mode after initialization is maybe 
>> not a good idea.  
> ...
>> By the way the IDE driver in the CentOS 5.x kernel (2.6.18) is not a 
>> module.  My googling has not turned up anything and there is no 
>> kernel command line option for the IDE driver that does this.
>
> I don't know which version it's for, but this:
>
> http://www.kernel.org/doc/Documentation/kernel-parameters.txt
>
> says you can use libata.force to set UDMA 2.  Doesn't it?

If that doesn't work, you can try fooling around with the BIOS settings 
(on every machine, ha ha) and using pnp_reserve_dma to trick the 
kernel.  But that's probably a lot less likely to work.

Angelo