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SubjectPromise 20267 in DMA mode?
Date
Hi,

How do I enable DMA for my Promise 20267 raid controller? I'm using kernel
2.4.18 with relevant config details:

CONFIG_BLK_DEV_PDC202XX=y
CONFIG_PDC202XX_BURST=y
# CONFIG_PDC202XX_FORCE is not set
CONFIG_BLK_DEV_ATARAID_PDC=y

cat /proc/ide/pdc202xx gives:

PDC20267 Chipset.
------------------------------- General Status
---------------------------------
Burst Mode : enabled
Host Mode : Normal
Bus Clocking : 66 External
IO pad select : 10 mA
Status Polling Period : 0
Interrupt Check Status Polling Delay : 0
--------------- Primary Channel ---------------- Secondary Channel
-------------
enabled enabled
66 Clocking disabled disabled
Mode MASTER Mode MASTER
FIFO Empty FIFO Empty
--------------- drive0 --------- drive1 -------- drive0 ---------- drive1
------
DMA enabled: no no no no
DMA Mode: UDMA 4 NOTSET UDMA 4 NOTSET
PIO Mode: PIO ? NOTSET PIO ? NOTSET

If I try hdparm -d1 /dev/hde it gives:

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

Please CC replies to me.

thanks, Iain.

--
PGP info: http://www.myspinach.org/~iain/pgpinfo.html


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