Re: Freeze Upon /dev/fd0 Use

Miklos Szeredi (Miklos.Szeredi@eth.ericsson.se)
Wed, 9 Sep 1998 10:39:02 +0200

> There isnt a general problem however since the floppy driver now claims to
> support the command line option "nodma" on boot.
>
> The first thing people should do however is make sure they have whatever
> the up to date BIOS for their machine is if it is Triton based. There
> were a small range of chipset bugs in triton which some early BIOS don't
> know about and boards may need to disable (peer concurrency/streaming stuff)

Yes concurrency and streaming are both switched off (this is the
default in setup, so BIOS knows about these chipset bugs), so this DMA
bug is independent.

The "nodma" option does work, but this makes floppy performance
unbearable (4kB/s instead of 20 kB/s), so this is not really a good
choice.

A better would be what Rik suggested, that for floppy and sound (and
only those) the use of two DMA channels at the same time be
prohibited.

Or at least, if sound is playing, don't allow floppy access at
all. This would still be better than if I have to exercise this
constraint myself, because I'm rather bound to forget...

Thanks
Miklos Szeredi

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