re: ide drive w/dma enabled causing system crash

Thierry vignaud (thierry.vignaud@ensea.fr)
Mon, 10 May 1999 21:40:58 +0200


> This seems to be a common problem with VP3/MVP3 systems when mixing
> transfers between UDMA and non-UDMA devices. E.g. I get it when
> transferring from my non-UDMA AOpen-40x cdrom to a UDMA Maxtor.

> For now the solution is to disable UDMA on the Maxtor when doing transfers
> to it from the cdrom. Other device transfers work fine with it in UDMA
> mode, but not the CDROM.

I've a via chipset with a 4Gb udma Maxtor and an asus 40x cdrom. The box
is killed each time i tried to mpeg a cd.
I've tried disabling udma on one or both drive but it's not enough.
After a week of try, i found that disabling udma and enabling
unmaskering interruptions on both drive was needed for a smooth use.

It seems that there is some problems with the gestion of dma channels.

Another bug that i've see on a P/120 is a conflict between the floppy
and the snd galaxy : when you play anything while accessing the floppy,
the box crashes. I've advised the guy to try builduing the drivers in
the core kernel instead of modules and I'am waiting for a answer.

I'will also try the new eide driver as it support my via chipset. I hope
it will solve all the problems.

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