Date: Wed, 2 Jan 2002 20:44:53 +0000 (UTC) From: Thilo Mezger <list-freebsd.stable@spoiled.org> To: stable@FreeBSD.org Subject: RELENG_4_4: PIIX busmastering DMA not supported Message-ID: <news2mail-a0vrg5$823$1@babel.spoiled.org>
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Hi! I was wondering if somebody could explain to me why busmastering DMA is not supported in my setup (RELENG_4_4): # dmesg | grep ata atapci0: <Intel PIIX ATA controller> port 0xfcf0-0xfcff at device 1.1 on pci0 atapci0: Busmastering DMA not supported ata0: at 0x1f0 irq 14 on atapci0 ata1: at 0x170 irq 15 on atapci0 ad0: 3090MB <Maxtor 83240D3> [6697/15/63] at ata0-master BIOSPIO ad2: 6187MB <FUJITSU MPE3064AT> [13410/15/63] at ata1-master BIOSPIO # sysctl -a | grep hw\.ata hw.ata.ata_dma: 1 hw.ata.wc: 1 hw.ata.tags: 0 hw.ata.atapi_dma: 0 hw.atamodes: pio,---,pio,---, What confuses me is that hw.ata.ata_dma=1 but I'm still not able to set hw.atamodes to dma,---,dma,---, I thought that this controller would support DMA. I read ata(4) and could not find any hints of any flags similar to the one for wd(4) (i.e. 0x2000). I'm quite clueless now... Any idea...? Thilo To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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