Re: Setting UDMA Mode on PCI Controller Card

> 
> Problem:
> 
> The problem is the DMESG shows the PIO MODE 4, Ultra-DMA mode 2 so there is no performance gain, using the atactl wd0 identify is shows me the drive is capable of UDMA 7. 
> 
> Question:
> 
> How can I increase the DMA Mode, or is this indicate something else is wrong?
> 
> Thanks for any advice.
> 
> -Mike


I did some further reading and found the “change” command. Using find wd*

I saw the flag was 0xa00 on the pciide so I set it to 0x0

Upon reboot I saw that wd0 had identified as Ultra DMA 6, but then the boot failed with 

bus-master DMA error: missing interrupt, status=0x21 

Obviously I’m doing something wrong. I’ll keep playing with it but if anyone has any suggestions I’d be happy to hear them

-Mike