Re: [issue1127] cdrom drive not detected
:I have a similar error on my home "debranded HP media PC" which is a
:Core2Duo intel chipset based motherboard, SATA hard disk and DVDRW, with
:bios option set to AHCI mode instead of IDE mode. With default boot
:options (no keyboard input) the CD fails to boot with same rootvp can't
:be found, apparently trying acd0, which doesn't exist under AHCI, and
:ends debugger prompt. If I watch the boot process and choose the "no
:AHCI" boot option, It finds the DVD rom and works fine, presumably
:because acd0 exists under nata. On a slightly older version, It would
:fail to the mountroot prompt and typing in cd9660:cd0 works sometimes or
:not with an "Device is in process of getting ready" type of message,
:showing up...
Hmm. A CD/DVD detected via the AHCI driver will probe as 'cd0'.
The root mount should try acd0, cd0, acd1, cd1, and cd8 (for USB
attached CD/DVDs).
The AHCI driver is supposed to probe everything before mountroot
runs. If it isn't one way to test and debug the situation is
to type '?' + <return> at the mountroot> prompt several times.
If the CD/DVD is still being probed then it should show up in the
list after a few tries and you should then be able to specify it
as the root mount.
The question would then become: Why didn't it probe before the
mountroot? The AHCI driver explicitly probes devices before letting
CAM finish up and mountroot to proceed. To figure that out a verbose
boot is probably needed. Sometimes a verbose boot changes the timing
enough such that the problem might not show up at all though :-(.
-Matt
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