How to fall back to PIO for IDE CD's?

To: current-users%netbsd.org@localhost
Subject: How to fall back to PIO for IDE CD's?
From: Julian Coleman <jdc%coris.org.uk@localhost>
Date: Wed, 18 Nov 2020 09:10:17 +0100

Hi,

Most (all) sparc64 have problems with DMA and CD/DVD drives connected to
the internal controller (aceride).  It's easy to work around this with
flags in the kernel configuration.  However the SPARCle has the hard drive
and the CD both connected to aceride.  Configuring PIO for all drives is
not a great solution here, because the HD works perfectly with DMA.

How can I configure "fallback to PIO only for CD's"?

Regards,

Julian

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