FWIW, here are my experiences with the new ATA driver. Firstly, I've been
following the discussion on -current, and decided that this weekend I'd
convert over to the new ata drivers - but with a bit of trepidation, given
the discussion that's been going on. Anyway, I've rebuild my kernel, rebooted
once, rebooted again, and the system seems to be holding together. The
sky has not fallen on my head...
Firstly, my old set up had:
controller wdc0 at isa? port IO_WD1 irq14
controller wdc1 at isa? port IO_WD2 irq15
device wd0 at wdc0 drive 0
device wd2 at wdc2 drive 0
Note that wd1 is not present. This caused a mild hickup when rebooting the
new kernel, since the new ata controller assigned the labels ad0 and ad1 to
the drives. It was not possible to boot into multiuser mode without changing
the /etc/fstab file to rename the /dev/wd2* entries to /dev/ad1*. That was
easy to fix, however for a newbie it might cause problems. I mention it now,
since the upgrade from 3.x might need special handling of this case (?).
Finally, I've noticed the following messages:
Dec 11 13:54:50 rabbit /kernel: ad1: UDMA CRC READ ERROR blk# 0 retrying
Dec 11 13:54:50 rabbit last message repeated 2 times
Dec 11 13:54:50 rabbit /kernel: ad1: UDMA CRC READ ERROR blk# 0 falling back to PIO
mode
It strikes me that these aren't serious - just that my hardware is rather
crappy (and doesn't support the faster UDMA modes) :-)
In case the developers are interested, here are selected portions of dmesg
of the pre/post changes...
<dmesg output trimmed>
Dec 11 13:41:29 rabbit /kernel.991204: FreeBSD 4.0-CURRENT #0: Sat Dec 4 19:07:15 WST
1999
Dec 11 13:41:29 rabbit /kernel.991204: pcib0: <Host to PCI bridge> on motherboard
Dec 11 13:41:29 rabbit /kernel.991204: pci0: <PCI bus> on pcib0
Dec 11 13:41:29 rabbit /kernel.991204: isab0: <VIA 82C586 PCI-ISA bridge> at device
7.0 on pci0
Dec 11 13:41:29 rabbit /kernel.991204: isa0: <ISA bus> on isab0
Dec 11 13:41:29 rabbit /kernel.991204: chip1: <VIA 82C586B IDE controller> at device
7.1 on pci0
Dec 11 13:41:29 rabbit /kernel.991204: wdc0 at port 0x1f0-0x1f7 irq 14 on isa0
Dec 11 13:41:29 rabbit /kernel.991204: wdc0: unit 0 (wd0): <WDC AC2700H>
Dec 11 13:41:29 rabbit /kernel.991204: wd0: 696MB (1427328 sectors), 1416 cyls, 16
heads, 63 S/T, 512 B/S
Dec 11 13:41:29 rabbit /kernel.991204: wdc1 at port 0x170-0x177 irq 15 on isa0
Dec 11 13:41:29 rabbit /kernel.991204: wdc1: unit 0 (wd2): <QUANTUM FIREBALL CR8.4A>
Dec 11 13:41:29 rabbit /kernel.991204: wd2: 8063MB (16514064 sectors), 16383 cyls, 16
heads, 63 S/T, 512 B/S
<contemplation over a cup of coffee:-)>
Dec 11 13:54:50 rabbit /kernel: FreeBSD 4.0-CURRENT #0: Sat Dec 11 13:34:57 WST 1999
Dec 11 13:54:50 rabbit /kernel: pcib0: <Host to PCI bridge> on motherboard
Dec 11 13:54:50 rabbit /kernel: pci0: <PCI bus> on pcib0
Dec 11 13:54:50 rabbit /kernel: isab0: <VIA 82C586 PCI-ISA bridge> at device 7.0 on
pci0
Dec 11 13:54:50 rabbit /kernel: isa0: <ISA bus> on isab0
Dec 11 13:54:50 rabbit /kernel: ata-pci0: <VIA 82C686 ATA controller> at device 7.1 on
pci0
Dec 11 13:54:50 rabbit /kernel: ata-pci0: Busmastering DMA supported
Dec 11 13:54:50 rabbit /kernel: ata0 at 0x01f0 irq 14 on ata-pci0
Dec 11 13:54:50 rabbit /kernel: ata1 at 0x0170 irq 15 on ata-pci0
Dec 11 13:54:50 rabbit /kernel: ata-isa0: already registered as ata0
Dec 11 13:54:50 rabbit /kernel: ata-isa1: already registered as ata1
Dec 11 13:54:50 rabbit /kernel: ad0: <WDC AC2700H/14.12X19> ATA-? disk at ata0 as
master
Dec 11 13:54:50 rabbit /kernel: ad0: 696MB (1427328 sectors), 1416 cyls, 16 heads, 63
S/T, 512 B/S
Dec 11 13:54:50 rabbit /kernel: ad0: 16 secs/int, 1 depth queue, PIO
Dec 11 13:54:50 rabbit /kernel: ad1: <QUANTUM FIREBALL CR8.4A/A5U.1200> ATA-4 disk at
ata1 as master
Dec 11 13:54:50 rabbit /kernel: ad1: 8063MB (16514064 sectors), 16383 cyls, 16 heads,
63 S/T, 512 B/S
Dec 11 13:54:50 rabbit /kernel: ad1: 16 secs/int, 1 depth queue, UDMA66
Dec 11 13:54:50 rabbit /kernel: Mounting root from ufs:/dev/ad0a
<then these messages...>
Dec 11 13:54:50 rabbit /kernel: ad1: UDMA CRC READ ERROR blk# 0 retrying
Dec 11 13:54:50 rabbit last message repeated 2 times
Dec 11 13:54:50 rabbit /kernel: ad1: UDMA CRC READ ERROR blk# 0 falling back to PIO
mode
To summarise, I've experienced no difficulty in changing to the new ATA
drivers. I'm in the midst of rebuilding world, and so far there have been no
errors in the process (and I don't expect any)
Thank you to the Soren, and the developers of this new driver.
Mike Kennett
([EMAIL PROTECTED])
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