From owner-freebsd-questions  Mon Jun 25 17:19:43 2001
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From: "Sven Vermeulen" <svenv@xs4all.nl>
To: "FreeBSD questions mailinlist" <freebsd-questions@freebsd.org>
Subject: problem enabling DMA on PCI ATA controller
Date: Tue, 26 Jun 2001 02:23:12 +0200
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I'am having problems with enabling DMA on my IDE controller. I don't
certainly know if my controller supports DMA, but when my system
(4.3-release) boots I receive the following messages from the ata driver:

atapci0: <Generic PCI ATA controller> port
0x3000-0x300f,0-0x3,0-0x7,0-0x3,0-0x7 at device 18.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
....
ad0: 1907MB <WDC AC22000L> [3876/16/63] at ata0-master BIOSDMA
acd0: CDROM <CDA26803I SE> at ata0-slave using PIO3
Mounting root from ufs:/dev/ad0s1a
ad0: READ command timeout tag=0 serv=0 - resetting
ata0: resetting devices .. done
ad0: READ command timeout tag=0 serv=0 - resetting
ata0: resetting devices .. done
ad0: READ command timeout tag=0 serv=0 - resetting
ata0: resetting devices .. done
ad0: READ command timeout tag=0 serv=0 - resetting
ad0: trying fallback to PIO mode
ata0: resetting devices .. done

So may'be my controller does support DMA because of the string "BIOSDMA"?
But at the end ad0 falls back to PIO mode. This points to a problem with the
controller? Or has it something to do with the BIOS which doesn't support
DMA?
May'be somebody can shine some light on this.

Here are the sysctls for the ata driver:

hw.ata.ata_dma: 1
hw.ata.wc: 0
hw.ata.tags: 0
hw.ata.atapi_dma: 1
hw.atamodes: pio,pio,

I'am using a (Biostar??) MB-8433UUD 486 mainboard and an AMD Am5x86
(486-class CPU) processor. The mainboard has a built-in IDE controller (I
don't know which chipset and manufacturer)


Thanks in advance,
Sven.


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