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Re: Promise 20267 in DMA mode?

Iain wrote:

How do I enable DMA for my Promise 20267 raid controller?

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.



Hi Iain,
IIRC, I have seen a kernel config option (2.4.18) for Promise controller specific DMA. 

HTH,
Barney.
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