from this page I got to the intel page listing ahci chipsets that
support hotswapping:
http://openbsd.lechtermann.net/cgi?action=article&sid=20070111131256
http://www.intel.com/support/chipsets/imst/sb/CS-012304.htm

AHCI is built into chipsets with the following controller hubs:

         Intel. ICH10R/DO SATA RAID/AHCI controller hub
         Intel. ICH10D SATA AHCI controller hub
         Intel. ICH9M-E SATA RAID/AHCI controller hub
         Intel. ICH9M AHCI controller hub
         Intel. 82801IR/IO Controller Hub (ICH9R/DO) - RAID and AHCI
         Intel. 82801HEM I/O Controller Hub (ICH8M-E) - RAID and AHCI
         Intel. 82801HBM I/O Controller Hub (ICH8M) - AHCI only
         Intel. 82801HR/HH/HO I/O Controller Hub (ICH8R/DH/DO) - RAID and AHCI
         Intel. 631xESB/632xESB I/O Controller Hub - RAID and AHCI

         Intel. 82801GHM I/O Controller Hub (ICH7MDH) - RAID only
         Intel. 82801GBM I/O Controller Hub (ICH7M) - AHCI only
         Intel. 82801GR/GH I/O Controller Hub (ICH7R/DH) - RAID and AHCI
         Intel. 82801FR I/O Controller Hub (ICH6R) - RAID and AHCI
         Intel. 82801FBM I/O Controller Hub (ICH6M) - AHCI only

From what I understand, your chipset (Intel 6321ESD AHCI) is not
explicitly listed, though there's a similar model and maybe this
webpage hasn't been updated properly.

Check this if it helps:
http://support.intel.com/support/chipsets/imst/sb/CS-015988.htm

Maybe you should look into getting a sata card that can hotswap or
change motherboard?

<disclaimer> I'm not an expert</disclaimer>


On Mar 23, 2009, at 13:16, Toni Mueller wrote:

Hi David,

On Mon, 23.03.2009 at 09:48:36 +0100, David Vasek <va...@fido.cz>
wrote:
On Sun, 22 Mar 2009, Toni Mueller wrote:
isa0 at mainbus0
com0 at isa0 port 0x3f8/0 irq4: ns8240, .. fifo

Not that I would be able to help with this, just note that these two
lines are very different from the dmesg you posted previously. My
guess
is you should prepare yourself for retyping the full dmesg.

yesterday, I typed from a blurry handset photo.  Anyway, I re-did the
experiment and managed to write down the exact error message. As far
as
I can see, booting proceeds as normal to this point:

pciide0: channel 1 ignored (disabled)

Then, AHCI is detected and immediately followed by a crash:

ahci0 at pci0 dev 31 function 2 "Intel 6321ESD AHCI" rev 0x09: irq
11, AHCI 1.1
fatal protection fault in supervisor mode
trap type 4 mode 18b rip ffffffff802ba2f8 cs8 rflags 10202 cr2  0
cpi e rsp ffffffff80b21b20

The operating system has halted.
...


While poking around in the BIOS, I also saw an option which suggested
that the machine can do something called "EFI OS booting" (or
similar).
Should I enable this?


Kind regards,
--Toni++

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