https://qa.mandrakesoft.com/show_bug.cgi?id=2275
------- Additional Comments From [EMAIL PROTECTED] 2003-02-24 17:30 -------
The DMA disabled message is a known 2.4.x issue with some chipsets (Via, IIRC) -
it temporarily disables the DMA to do setup, then re-enables it. For some reason
(I don't follow 2.4.x kernel stuff very closely, so don't know what the reason
is), the re-enable is done silently. I thought Alan Cox had published a patch
for it, but I could be wrong.
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status: UNCONFIRMED
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description:
Run "dmesg | grep DMA" and the output is:
VP_IDE: VIA vt82c686b (rev 40) IDE UDMA100 controller on pci00:07.1
ide0: BM-DMA at 0xc000-0xc007, BIOS settings: hda:DMA, hdb:DMA
ide1: BM-DMA at 0xc008-0xc00f, BIOS settings: hdc:DMA, hdd:DMA
hda: DMA disabled
hdb: DMA disabled
hdc: DMA disabled
hdd: DMA disabled
hda: 39102336 sectors (20020 MB) w/2048KiB Cache, CHS=2434/255/63,
UDMA(100)
hdb: 78165360 sectors (40021 MB) w/2048KiB Cache, CHS=4865/255/63,
UDMA(100)
The messages show DMA as disabled but the UDMA mode for each of hda
and hdb is listed as 100. Why this contradiction ?
Both "hdparm -i /dev/hda" and "hdparm -i /dev/hdb" have this line:
UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
which shows that DMA is indeed enabled !! This is supported by entries in
/proc/ide/hd*/settings too. So why these kernel messages about DMA disabled
?
