Messages in this thread |  | | Date | 5 Nov 2000 14:26:59 GMT | From | (Rob Andrews) | Subject | IDE (hpt370) and DMA mode switching (again)... |
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Hello,
I wrote about a week or so ago about switching DMA modes on the HPT370 controller.
I've been fiddling and have found something odd.
If I compile a kernel without the 'HPT370' option in the IDE/ATA config, the machine starts okay, and after turning DMA on, the drive fetches about 21.5MB/s. hdparm tells me the drive/chipset is in udma4. I can change the DMA mode without crashing, although if I change out of udma4, I can't set it back to udma3/udma4 (states that the mode is not functional).
If I compile a kernel /with/ the 'HPT370' option in the IDE/ATA config, the machine starts okay, turns DMA mode on itself, and puts the drive into udma2. The drive fetches 17.4MB/s. If I change DMA mode, the machine crashes. No kernel panic, nothing - just completely dead.
Any ideas?
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