Re: DMA Transfer

[Philipp Buehler <OpenBSD_(_at_)_fips_(_dot_)_de>]

On 25/07/2002, Meishing Wang <meishingw_(_at_)_yahoo_(_dot_)_com> wrote To tech_(_at_)_openbsd_(_dot_)_org:
>    Is it on Ultra-DMA mode 3?

yes.

> wd0c:  aborted command, interface CRC error reading
> fsbn 0 (wd0 bn 0; cn 0 tn 0 sn 0), retrying
> wd0: transfer error, downgrading to Ultra-DMA mode 4
> wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 4
> wd0c:  aborted command, interface CRC error reading
> fsbn 0 (wd0 bn 0; cn 0 tn 0 sn 0), retrying
> wd0: transfer error, downgrading to Ultra-DMA mode 3
> wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 3
> wd0c:  aborted command, interface CRC error reading
> fsbn 0 (wd0 bn 0; cn 0 tn 0 sn 0), retrying
> wd0: soft error (corrected)

Here it can recover from the first error after downgrading to UDMA-3

You can fix this value w/ config(8), read wd(4) what the flag
values mean. If you dont understand it, leave it alone, it will just
take a little longer to boot.

A shorter and/or better cable could help also.

ciao
-- 
Philipp Buehler, aka fips | sysfive.com GmbH | BOfH | NUCH | <double-p> 

#1: Break the clue barrier!
#2: Already had buzzword confuseritis ?