more multiple dec21140 on ppc <fixed>

[gregory.menke at gsfc.nasa.gov]

Valette Eric writes:
 > gregory.menke at gsfc.nasa.gov wrote:
 > 
 > >  > One was booting and the other just loop asserting the interrupt always 
 > >  > looking the bott while the same binary was working fine on the other 
 > >  > board...
 > > 
 > > I've seen some IDE strangeness on mcp750's as well.  In our case, we
 > > cannot boot with the root filesystem on an IDE on any of our 4 750
 > > units running 2.4.19.  Though once booted, all of them use the IDE
 > > just fine.  We have to either use a scsi or nfs root.  The nfs case is
 > > accidentally beneficial for driver developers because when the machine
 > > locks, theres no filesystem check on restart- which is nice.
 > 
 > I had patches to make MCP750 work correctly on IDE. I can try to find 
 > them back on tape archive. But be sure that you specify the right root 
 > when booting something like root=/dev/hdc1 because by default it use 
 > SCSI. Also you must have a small primary prep bootable partition and 
 > just dd vmlinuz on this partition. You can then boot directly from disk 
 > using something like pboot a;
 > 

We got lost hdc interrupts when Linux was probing the IDE hardware,
and it wouldn't mount root off the drive.  Thats what made me think of
this edge/level setting possibility.

Gregm