[ILUG] IDE DMA problem

[Jak]

I have also been using the patch provided by Ali to enable UDMA. No problems to report, but
again I don't have much intensive disk access. The patch is for kernel 2.2.12, but succeeds 
against 2.2.14 also. There is support on the way : you can use one of Andre Hedrick's IDE 
patches available from any kernel mirror in linux/kernel/people/hedrick/ which add support
for several newer chipsets. However, I could not get a stable kernel when I tried them some time
back, so I stuck with the Ali patch. Maybe it was just my hardware, or maybe it's sorted by now.
	I thought the ALI15X3 chipset was not recognised when the kernel did not have
support compiled, but maybe my memory has given up. Once the UDMA capability is recognised,
it is enabled by default in current kernels, so you don't need to use hdparm
						rfjak at eircom.net

> I've been trying to tune my IDE performance using hdparm but it refuses to> turn on DMA with the following error
> 
> bagend:~ # hdparm -d 1 /dev/hdd
>  
> /dev/hdd:
>  setting using_dma to 1 (on)
>  HDIO_SET_DMA failed: Operation not permitted
>  using_dma    =  0 (off)
>