wow great is working not show up the message ,
i found in manual link :
WD(4)                     OpenBSD Programmer's Manual                    WD(4)
NAME

     wd - WD100x compatible hard disk driver
SYNOPSIS

     wd* at wdc? flags 0x0000

     wd* at pciide? flags 0x0000
DESCRIPTION

     The wd driver supports hard disks which emulate the Western Digital

     WD100x.  This includes standard MFM, RLL, ESDI, IDE, and EIDE drives, as

     well as Serial ATA drives, and PCMCIA/CF storage media.
     The flags are used only with controllers that support DMA operations and

     mode settings (like some pciide(4) controllers).  The lowest order

     (rightmost) nibble of the flags define the PIO mode to use.  The next

     four bits indicate the DMA mode and the third nibble the UltraDMA mode.
     For each set of four bits, the 3 lower bits define the mode to use and

     the last bit must be set to 1 for this setting to be used.  For DMA and

     UltraDMA, 0xf (1111) means ``disable''.  For example, a flags value of

     0x0fac (1111 1010 1100) means ``use PIO mode 4, DMA mode 2, disable

     UltraDMA''.  The special setting 0x0000 means ``use whatever the drive

     claims to support''.
But  PIO mode is more slowest than udma , how to chek perfomance  the

cf card in linux using hdparm how about in openbsd ( test  cf card ) .
On Mon, Jun 30, 2008 at 2:46 PM, Stuart Henderson  wrote:

quoted text
> On 2008-06-30, sonjaya  wrote:

>> I have  CF ( compact Flash ) Vgen 1G , and converter ide to cf . I try

>> install openbsd 4.3 in cf and succesfully and try first boot i get

>> error message like this bellow:

>> how to solved  this ?

>

> Your CF card supports DMA transfers, but the adapter doesn't

> have the correct lines wired up.

>

> http://marc.info/?l=soekris-tech&m=117879934817861&w=2

>

>> pciide0:0:0: bus-master DMA error: missing interrupt, status=0x21

>> wd0: transfer error, downgrading to PIO mode 4

>> wd0(pciide0:0:0): using PIO mode 4

>> wd0c: device timeout reading fsbn 0 (wd0 bn 0; cn 0 tn 0 sn 0), retrying

>> wd0: soft error (corrected)

>> root on wd0a swap on wd0b dump on wd0b

>

> Ah good, at least your card implements the RESET command so

> the automatic downgrade to PIO works.

>

>

--

sonjaya

http://sicute.blogspot.com