ata - interrupt seen but task queue stalled

[Jon Noack]

On 3/23/2004 1:34 AM, Ketrien I. Saihr-Kesenchedra wrote:
> At 01:29 AM 3/23/2004, you wrote:
>> I get this when I have a Pioneer DVD connected. I had to disable it in
>> the BIOS to get the machine to boot.
> 
> This is a slimline IBM/Toshiba 24x CD-ROM. Very vanilla. Doesn't do 
> anything over PIO4. Don't have the dmesg output for it handy.
> 
>> Sometimes booting with media in the drive helps.
> 
> First thing I tried, same thing. Wondering why it's forcing down to PIO4 
> in the kernel to begin with, but that's a problem for another day. ie; 
> Once it's booting right again. ;/

ATAPI devices default to PIO (DMA off).  See the ata(4) man page, 
specifically the 'hw.ata.atapi_dma' sysctl.  To enable DMA for ATAPI 
devices, you have to add 'hw.ata.atapi_dma="1"' to /boot/loader.conf or 
use atacontrol(8).

Jon