CVS commit: src/sys

["Jonathan A. Kollasch" <jakllsch%netbsd.org@localhost>]

Module Name:    src
Committed By:   jakllsch
Date:           Mon Feb 17 19:01:04 UTC 2025

Modified Files:
        src/sys/arch/i386/conf: LEGACY
        src/sys/dev/ata: ata.c files.ata

Log Message:
Restore ATA DMA mode downgrade support everywhere; it's a necessary part
of any system supporting (parallel) ATA DMA.  There is hardware out there,
including cobalt, macppc, and sparc64 where this functionality is
necessary to avoid non-functional disks, either in as-shipped hardware
configurations or with add-in cards, or perhaps just with compromised
IDE/PATA cables.

Should address:
  PR 58767
  PR 59023
  PR 59078

If anyone really insists on not having this support they can now turn it
off themselves with `options ATA_NO_DOWNGRADE_MODE`


To generate a diff of this commit:
cvs rdiff -u -r1.4 -r1.5 src/sys/arch/i386/conf/LEGACY
cvs rdiff -u -r1.170 -r1.171 src/sys/dev/ata/ata.c
cvs rdiff -u -r1.32 -r1.33 src/sys/dev/ata/files.ata

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.