Re: scsi freezing problem with NetBSD current

["T. Makinen" <tjamaloo%gmail.com@localhost>]

On Sun, Oct 26, 2008 at 5:06 PM, David Brownlee <abs%netbsd.org@localhost> 
wrote:


>        Nice catch.
>
>        It looks like very few drivers (5 including atari/dev/ncr5380.c)
>        set XS_STS_DONE now and its quite possible some of the
>        others are abusing the interface too.
>
>        Could you build a bootable current image and see if other
>        users on the list could confirm it fixes it for them also?

Yes, here is link to current kernel compiled with patched ncr5380.c:
http://koti.welho.com/tmakinen/atari/netbsd-current-atari-BOOT-20081026.gz

>        Hmm, one thought is there could be DMA issues with TT-ram. I'm not
>        familiar with the atari pmap, but if so this should be fixable by
>        tagging the TT-ram differently and forcing the memory provided for
>        to come from the other set.

Yes it seems to be DMA issue. ncr5380 driver sets DRIVER_BOUNCING for Falcon
if TT-ram is used for DMA and final result for some reason is wrong drive
size. If I bypass memory region check in atari5380.c, drive reports correct
capacity and other related information, but netbsd does not continue to boot
system from that drive. Actually even if I boot netbsd with TT-ram disabled,
netbsd finds ffs file system from drive but usually it does not continue to
boot system.

No problems if I bypass CT63 accelerator (no 68060 and TT-ram).

If I compile netbsd with REAL_DMA undefined, there's no problems with
CT63 & TT-ram.

Information about CT63 accelerator:
http://www.czuba-tech.com/CT60/english/overview63.htm

-Tuomo