jaroug wrote:
Hi,
I own a motherboard with a nforce2 based chipset. The problem is that I
can't enable dma (debian sid 2.6.15-1-k7) :
# hdparm -c1 -d1 /dev/hda
/dev/hda:
setting 32-bit IO_support flag to 1
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
IO_support = 1 (32-bit)
using_dma = 0 (off)
lspci result :
# lspci |grep -i ide
0000:00:09.0 IDE interface: nVidia Corporation nForce2 IDE (rev a2)
I think the good module is loaded :
# lsmod |grep amd74x
amd74xx 12892 0 [permanent]
ide_core 112928 5
ide_cd,amd74xx,generic,ide_disk,ide_generic
Just note that dma works with the same hard drive and an other
motherboard.
If anybody have an idea, because it's very slooow :/
I had this problem in the past (with the piix module) and I remember
that some people here also experienced it with other controllers. I
think that you can only turn on DMA if you make sure that your
controller's module (amd74x) is loaded before the ide_generic module
during boot. For this it might be enough to install the package
"initramfs-tools", rebuild your initrd and reboot. More details can be
found in this (rather lengthy) entry in the bug tracker:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=345374
The other option is to include the module statically in the kernel, if
compiling a custom kernel is acceptable for you.
Regards,
Florian
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