current.html diff documenting ahci change

My day started with an upgrade to the 2007-03-27 snapshot on my
laptop, and by this afternoon I finally got around to writing what
might be a usable entry for the web.

Diff inline below (output from diff -u).

Cheers,
Peter

--- current.html.ori	Thu Mar  8 17:58:30 2007
+++ current.html	Wed Mar 28 15:20:15 2007
@@ -41,6 +41,7 @@
 accounting on boot</a>
 <li><a href="#20070226">2007/02/26 - spamd: greylisting on by
 default; config files moved to /etc/mail</a>
+<li><a href="#20070327">2007/03/27 - updated ahci(4) may cause device name change for SATA disks</a>
 <!-- New additions go on the bottom, please -->
 </ul>
     
@@ -212,6 +213,46 @@
 for all the details.
 </p>
 
+<a name="20070327"></a>
+<h3>2007/03/27 - updated ahci(4) may cause device name change for SATA disks</h3>
+<p>
+Recent changes to the <tt>ahci(4)</tt> subsystem can cause SATA disks which were formerly
+recognized as wd* (e.g <tt>wd0</tt>) devices to turn up as sd* (e.g <tt>wd0</tt>) devices instead. 
+<p>
+This is a potential problem if you upgrade from an earlier snapshot.  Watch the <tt>dmesg</tt>
+output at boot.  A drive which turned up earlier as
+<pre>
+pciide1 at pci0 dev 31 function 2 "Intel 82801GBM AHCI SATA" rev 0x02: DMA, channel 0 wired to native-PCI, channel 1 wired to native-PCI
+pciide1: using apic 2 int 11 (irq 11) for native-PCI interrupt
+wd0 at pciide1 channel 0 drive 0: <FUJITSU MHV2080BH>
+wd0: 16-sector PIO, LBA48, 76319MB, 156301488 sectors
+wd0(pciide1:0:0): using PIO mode 4, Ultra-DMA mode 5
+</pre>
+<p>
+now instead turns up as
+<pre>
+ahci0 at pci0 dev 31 function 2 "Intel 82801GBM AHCI SATA" rev 0x02 GHC 0x0: AHCI 1.1: apic 2 int 16 (irq 11)
+ahci0: capabilities: 0xc710ff03<S64A,NCQ,SALP,SAL,SCLO,PMD,SSC,PSC> ports: 4 ncmds: 32 gen: 1 (1.5Gbps)
+ahci0: ports implemented: 0x00000001
+ahci0.0: port reset
+ahci0: detected device on port 0
+scsibus1 at ahci0: 32 targets
+sd0 at scsibus1 targ 0 lun 0: <ATA, FUJITSU MHV2080B, 0084> SCSI2 0/direct fixed
+sd0: 76319MB, 76319 cyl, 64 head, 32 sec, 512 bytes/sec, 156301488 sec total
+</pre>
+<p>
+The recommended workaround is to edit your <tt>/etc/fstab</tt> file,
+changing the relevant <tt>/dev/wd</tt> entries to refer to
+<tt>/dev/sd</tt> devices and partitions instead.
+<p>
+The other option is to disable <tt>ahci</tt> using <tt>config(8)</tt> or <tt>boot -c</tt>.
+<p>
+Refer to the manpages for
+<a href="http://www.openbsd.org/cgi-bin/man.cgi?query=ahci&amp;sektion=4">achi(4)</a>
+and
+<a href="http://www.openbsd.org/cgi-bin/man.cgi?query=config&amp;sektion=8">config(8)</a>
+for all the details.
+</p>
 
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-- 
Peter N. M. Hansteen, member of the first RFC 1149 implementation team
http://www.blug.linux.no/rfc1149/ http://www.datadok.no/ http://www.nuug.no/
"First, we kill all the spammers" The Usenet Bard, "Twice-forwarded tales"
delilah spamd[29949]: 85.152.224.147: disconnected after 42673 seconds.