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Document the use of flags to set/disable PIO/DMA/UDMA modes.

This commit is contained in:
bouyer 1998-12-02 10:54:26 +00:00
parent 45675ab14b
commit ab57245c0f
1 changed files with 17 additions and 8 deletions
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25
sys/arch/i386/conf/GENERIC
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@ -1,4 +1,4 @@
# $NetBSD: GENERIC,v 1.205 1998/11/23 20:47:03 christos Exp $
# $NetBSD: GENERIC,v 1.206 1998/12/02 10:54:26 bouyer Exp $
#
# GENERIC -- everything that's currently supported
#
@ -316,7 +316,7 @@ uk* at scsibus? target ? lun ? # SCSI unknown
# IDE and Related Devices
# PCI IDE controllers (CMD tech's PCI0640, Intel's PIIx).
# PCI IDE controllers (CMD tech's PCI0640, Intel's PIIx, ...).
# The 0x0001 flag force the driver to use DMA, even if the driver doesn't know
# how to set up DMA modes for this chip. This may work, or may cause
# a machine hang with some controllers.
@ -332,18 +332,27 @@ wdc* at pcmcia? function ?
wdc0 at isa? port 0x1f0 irq 14
wdc1 at isa? port 0x170 irq 15
# IDE drives
wd* at wdc? channel ? drive ?
wd* at pciide? channel ? drive ?
# IDE drives.
# Flags are used only with controlers that support DMA operations
# and mode settings (e.g. some pciide controllers)
# The first 4 bytes of the flags define the PIO mode to use, the
# second DMA mode and the third UltraDMA mode. For each group of 4 bytes,
# the 3 lower define the mode to use, and the last one must be 1 for the
# setting to be used. For DMA and UDMA, 0xf means 'disable'.
# 0x0fac means 'use PIO mode 4 DMA mode 2, disable UltraDMA'.
# 0x0000 means "use whatever the drive claims to support.
wd* at wdc? channel ? drive ? flags 0x0000
wd* at pciide? channel ? drive ? flags 0x0000
# ATAPI bus support
atapibus* at wdc? channel ?
atapibus* at pciide? channel ?
# ATAPI devices
cd* at atapibus? drive ? # ATAPI CD-ROM drives
sd* at atapibus? drive ? # ATAPI disk drives
uk* at atapibus? drive ? # ATAPI unknown
# flags have the same meaning as for IDE drives.
cd* at atapibus? drive ? flags 0x0000 # ATAPI CD-ROM drives
sd* at atapibus? drive ? flags 0x0000 # ATAPI disk drives
uk* at atapibus? drive ? flags 0x0000 # ATAPI unknown
# Miscellaneous mass storage devices