From owner-freebsd-questions  Sun Jun 20 11:20:54 1999
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Date: Sun, 20 Jun 1999 11:21:03 -0700
From: Tetsuya Watanabe <tetsuya1@prodigy.net>
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Subject: intel piix4 tuning
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Hello,

I would like to know how to turn on DMA33 or piomode4, at least, of
intel piix4 chip. I am sure wdc0 is a dma33 hdd. Thank you. 

I have the following parameters in my kernel:
controller      wdc0    at isa? port "IO_WD1" bio irq 14
disk            wd0     at wdc0 drive 0
disk            wd1     at wdc0 drive 1

controller      wdc1    at isa? port "IO_WD2" bio irq 15
disk            wd2     at wdc1 drive 0
disk            wd3     at wdc1 drive 1

options         ATAPI           #Enable ATAPI support for IDE bus
options         ATAPI_STATIC    #Don't do it as an LKM
device          acd0            #IDE CD-ROM

I now have the following dmesg output: 
ide_pci0: <Intel PIIX4 Bus-master IDE controller> rev 0x01 on pci0.7.1
wdc0 at 0x1f0-0x1f7 irq 14 on isa
wdc0: unit 0 (wd0): <IBM-DHEA-36481>
wd0: 6197MB (12692736 sectors), 12592 cyls, 16 heads, 63 S/T, 512 B/S
wdc0: unit 1 (wd1): <ST33240A>
wd1: 3077MB (6303024 sectors), 6253 cyls, 16 heads, 63 S/T, 512 B/S
wdc1 at 0x170-0x177 irq 15 on isa
wdc1: unit 0 (wd2): <IBM-DCAA-34330>
wd2: 4134MB (8467200 sectors), 8400 cyls, 16 heads, 63 S/T, 512 B/S
wdc1: unit 1 (atapi): <NEC                 CD-ROM DRIVE:28C/3.02>,
removable, dma, iordy
acd0: drive speed 2412 - 5512KB/sec, 128KB cache
acd0: supported read types: CD-R, CD-RW, CD-DA
acd0: Audio: play, 256 volume levels
acd0: Mechanism: ejectable tray
acd0: Medium: no/blank disc inside, unlocked


Tetsuya


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