DMA addressing

Cliff McDiarmid cliffhanger at
Sat Nov 13 05:00:04 PST 2004

I've just upgraded to kernel 2.6.5 from 2.4.20, successfully, but have lost DMA on my hard drive, despite all the previous config options being selected.   I have a PIII Coppermine.   
hdparm /dev/hda gives: 
 multcount    =  0 (off) 
 I/O support  =  3 (32-bit w/sync) 
 unmaskirq    =  0 (off) 
 using_dma    =  0 (off) 
 keepsettings =  0 (off) 
 nowerr       =  0 (off) 
 readonly     =  0 (off) 
 readahead    = 256 (on) 
 HDIO_GETGEO_BIG failed: Invalid argument 
hdparm -d1 /dev/hda gives: 
 setting using_dma to 1 (on) 
 HDIO_SET_DMA failed: Operation not permitted 
 using_dma    =  0 (off) 
I've trawled through other options in the kernel to get this turned on, without success.  Any ideas?? 
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