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Date: Mon, 3 Nov 2003 10:59:45 +0200
From: Rumen Telbizov <altares@e-card.bg>
To: stable@freebsd.org
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cc: sos@freebsd.org
Subject: FreeBSD and serial ata
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Dear List,

This is my second post since I did not receive
any answers the first time.

I have P4P800-VM motherboard with serial ata
controlers (ICH5) and serial ata discs. I managed
to install FreeBSD 4.9-STABLE on this box when
setting the IDE controller in legacy mode.
Everything works normal except when booting, 
the drives are set into UDMA33 mode:

atapci0: <Intel ICH5 SATA150 controller> port
0xfc00-0xfc0f,0-0x3,0-0x7,0-0x3,0-
0x7 irq 0 at device 31.2 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0

ad0: DMA limited to UDMA33, non-ATA66 cable or device
ad0: 76319MB <ST380013AS> [155061/16/63] at ata0-master UDMA33
ad1: DMA limited to UDMA33, non-ATA66 cable or device
ad1: 76319MB <ST380013AS> [155061/16/63] at ata0-slave UDMA33

I read somewhere that this message is a hoax and that
the drive should actually work in UDMA150. Is this my case?


I also checked the source of ata-dma.c:
Here is the section.

#if 1
    if (udmamode > 2 && !atadev->param->hwres_cblid) {
	    ata_prtdev(atadev,"DMA limited to UDMA33, non-ATA66 cable or device\n");
	    udmamode = 2;
    }
#endif


Maybe this should sound like:
    if ( (udmamode > 2) && (udmamode < 5) && (!atadev->param->hwres_cblid) ) {
	    ata_prtdev(atadev,"DMA limited to UDMA33, non-ATA66 cable or device\n");
	    udmamode = 2;
    }

All comments are wellcome.

Thank you in advance

Rumen Telbizov