precision m70 DVD/CDRW no DMA!!

matrixon · 01-19-2006, 01:49 PM

hi im using 2.6.11-gentoo-r6 and i cant enable my DMA for my GCC-4243M DVD/CDRW its a PATA device
i have my kernel configuration right an i still cant activate DMA anyone know how i can enable it?

Oliv' · 01-20-2006, 08:29 AM

Hello,

if your kernel config is right, you should be able to enable it with hdparm utility

Oliv'

matrixon · 01-20-2006, 10:11 AM

nop i cant my kernel configuration is right but i still cant use hdparm to enable it

root@wlprf54-117 matrix # hdparm -d1 /dev/cdroms/cdrom0

/dev/cdroms/cdrom0:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma = 0 (off)

and my kernel does have the right configuration for dma

Oliv' · 01-20-2006, 10:26 AM

and you are sure that your config uses the good IDE chipset ? because CONFIG_BLK_DEV_IDEDMA or CONFIG_IDEDMA_AUTO are not the only one to enable to have DMA enable... you must also enable the option for your IDE chipset. For example for my Asus A7N8X-X motherboard, I have to enable CONFIG_BLK_DEV_AMD74XX option to be able to activate DMA.

Oliv'

matrixon · 01-20-2006, 10:35 AM

yep i have even try to enable all chipset support...lol.... in my desperate attemp to enable dma but i still cant :S
any ideas?

Oliv' · 01-20-2006, 10:57 AM

a friend had has the same problem and in fact it was due to the fact that its chipset support was compiled as module and not in the kernel. When he compiled it in the kernel, it worked fine

To find which IDE chipset to use: lspci -v | grep IDE
and then have a look at the IDE chipset help menu during kernel configuration step

you can also check that your drive supports dma mode: hdparm -i /dev/hdc

matrixon · 01-21-2006, 10:24 AM

my chipset its ich6 which option should i choose generix x86 chipsets?

Oliv' · 01-21-2006, 12:24 PM

seems to be piix driver:
Device Drivers
ATA support
Intel PIIXn chipsets support

matrixon · 01-31-2006, 10:54 PM

i have pIIIx chipset support compiled in the kernel but still no dma :S

Oliv' · 02-01-2006, 02:07 AM

you can also check that your drive supports dma mode: hdparm -i /dev/hdc