can't set hdparm -d1 and correct kernel config

["Benedict Verheyen" <linux4bene@pandora.be>]

Hi,

i have 2 matrox hd disks and whenever i want to set the dma to 1 i get this error:
HDIO_SET_DMA failed: Operation not permitted
The first is a 40 Gb Matrox IDE and the second a 120 GB Matrox IDE.
They are recent disks (< 1 year). My motherboard is abit b6, intel 440bx chipset PIIX4 IDE. lspci reports that it's a intel 440bx chipset (82443 BX/ 82371 EB)

A while ago i recompiled the kernel for LVM support and i think i might have excluded something that the kernel needs to set the dma.
What kernel options do i need to have set in order to allow dma=1?

Thanks.
Benedict