Date: Fri, 04 Apr 2003 19:38:50 -0500 From: Matthew Donadio <m.p.donadio@ieee.org> To: freebsd-stable@freebsd.org Subject: How does UDMA mode get set? Message-ID: <3E8E259A.F0864F4D@ieee.org>
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Hi all, I have been tracking -STABLE on one of my home machines for a little while, now and noticed something the other day. I was given this system, and I have only run FreeBSD-STABLE on it. The motherboard is a Supermicro370SWD with an Intel 810 "Whitney" chipset (82810DC100 GMCH + 82801AA ICH). The docs say that there is support for UDMA66, but FreeBSD reports that the drive is being set to UDMA33. I booted in verbose mode, and here are the relevant parts from dmesg. atapci0: <Intel ICH ATA66 controller> port 0xffa0-0xffaf at device 31.1 on pci0 ata0: iobase=0x01f0 altiobase=0x03f6 bmaddr=0xffa0 ata0: mask=03 ostat0=50 ostat2=50 ata0-master: ATAPI 00 00 ata0-slave: ATAPI 14 eb ata0: mask=03 stat0=50 stat1=10 ata0-master: ATA 01 a5 ata0: devices=09 ata0: at 0x1f0 irq 14 on atapci0 ... ad0: success setting UDMA2 on Intel chip Creating DISK ad0 ar: FreeBSD check1 failed ad0: <Maxtor 4D040H2/DAH017K0> ATA-6 disk at ata0-master ad0: 38146MB (78125000 sectors), 77504 C, 16 H, 63 S, 512 B ad0: 16 secs/int, 1 depth queue, UDMA33 ad0: piomode=4 dmamode=2 udmamode=5 cblid=1 My question is, why did the kernel set UDMA33 mode instead of UDMA66 mode? Yes, I have the proper cable, and the drive support up to UDMA100. I didn't see anything obvious in the BIOS that would prevent UDMA66 mode, but I could have missed something. Thanks. -- Matthew Donadio (m.p.donadio@ieee.org)
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