I rebuilt kernel with 2.4.20 with patch ,
then I can not set the DMA mode on my 
hda drive.

hdparm -d 1 /dev/hda

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

I have no problem with old REDHAT7.1.

From my .config,

CONFIG_BLK_DEV_IDEDMA_PCI = y
# CONFIG_BLK_DEV_IDEDMA_FORCED
CONFIG_IDEDMA_PCI_AUTO = y
CONFIG_BLK_IDEDMA = y

Any comment or suggestion?


Bo