bootstrap: panic: ... invalid IO size

[Marc Singer <elf@buici.com>]

I'm installing the Hurd on one of my machines.  On two of them, I'm
receiving the same message when the kernel appears to be attempting to
mount the root filesystem.

  boostrap: panic: /dev/hd2s3//hurd/ext2.static (OS/device) invalid IO size

The install was easy as long as I followed the instructions
carefully. However, I noticed a couple of anomolies during the boot
process.  

The first machine I attempted to install on has a bad, on-board IDE
controller.  I'm using a promise controller which may be an ATA66.  I
added a second drive for all of this, so I expected it to be hd1, but
it was consistently recognized as hd5.  Zero through three are (I'm
guessing here) being reserved by what should be two onboard
IDE controllers.  I found that the kernel would load, but I got the
above message with a different drive number.

I turned to the mailing list to find someone having problems with an
ATA66 controller, so I moved the hard drive to another machine.  This
one has only one IDE drive.  The primary controller is being used for
a CD ROM, so I put this drive on the secondard controller as master.

It took some fiddling, but I use the root= command to determine that
this drive was called hd1.  It must think that hd0 is the SCSI drive
because the BIOS is configured to boot to the SCSI controller.  I
found the kernel using root=hd1s3.  Then, when the kernel booted, it
didn't like that, so I tried hd2s3 and received the above message.

Is this a message printed when I refer to a non-existent device?  

I checked that the ext2 partition has the correct ID and was built
with the sparse_super option.

Help will be appreciated.