[9fans] Re: VT8235 SouthBridge not recognized (details)

[9fans] Re: VT8235 SouthBridge not recognized (details)

[John Stalker]

Thanks for your help.  I can boot the new kernel.  I still get the error
message from 9load, because it hasn't changed on the floppy, but I no longer
get a message from the kernel.  I now have a /dev/pci with lots of odd looking
stuff.  I don't have a /dev/ether0, though.  Any pointers on how to interpret
the contents of /dev/pci?
				John

>The table gets used in pci.c
>
>	for(i = 0; i != nelem(southbridges); i++)
>		if(sbpci->vid == southbridges[i].vid && sbpci->did == southbridges[i].did)
>			break;

>Might as well try adding a new entry and see what happens.
>After doing that, 
>
>	cd /sys/src/9/pc
>	mk 'CONF=pcdisk'
>	9fat:
>	acme /n/9fat/plan9.ini
>
>and add 
>
>	bootfile=sdC0!fs!/sys/src/9/pc/9pcdisk
>
>to plan9.ini (leave the old bootfile= line too)
>and it will prompt you at boot to choose a kernel.
>
>Russ

Re: [9fans] Re: VT8235 SouthBridge not recognized (details)

[Russ Cox]

The best way to interpret the contents
of /dev/pci is to run the "pci" command,
which shows the pci device numbers, vid/did pairs, 
and config spaces.

The raw files aren't really for human consumption.

Russ

Re: [9fans] Re: VT8235 SouthBridge not recognized (details)

[David Gordon Hogan]

It should be pointed out that having your south bridge
recognized by the kernel is entirely optional.  It is used
to implement workarounds for bad BIOSes on a very
small percentage of machines.  The message that you were
getting is only a warning.

I'd be cautious about adding new types of south bridges
without first consulting the data sheets for the parts in
question.  Though the worst that could happen is that
you get a kernel that won't work.

Re: [9fans] Re: VT8235 SouthBridge not recognized (details)

[Russ Cox]

The table gets used in pci.c

	for(i = 0; i != nelem(southbridges); i++)
		if(sbpci->vid == southbridges[i].vid && sbpci->did == southbridges[i].did)
			break;

Might as well try adding a new entry and see what happens.
After doing that, 

	cd /sys/src/9/pc
	mk 'CONF=pcdisk'
	9fat:
	acme /n/9fat/plan9.ini

and add 

	bootfile=sdC0!fs!/sys/src/9/pc/9pcdisk

to plan9.ini (leave the old bootfile= line too)
and it will prompt you at boot to choose a kernel.

Russ

[9fans] Re: VT8235 SouthBridge not recognized (details)

[John Stalker]

I assume that I am more or less on my own on this one.  I poked around
a bit in pci.c.  The VT8235 is reporting a vid of 0x1106, as it should since
it is a VIA chip, and a did of 0x3177.  The latter doesn't match the sb_did
field of the elements of the array southbridges.  I could just try adding
a new entry, but I don't have any clear idea what that will do.  Can anyone
tell me where the sb_did field of southbridge gets used?  It is certainly not
in pci.c itself.  Assuming that I do this--it can't do much harm as it is
a fresh install--how do I make sure everything which needs to be updated is
updated?  In particular, the error is first reported by 9load on my boot
floppy as near as I can determine.  The second error message I think
comes from the loaded kernel.
--
John Stalker
Department of Mathematics
Princeton University
(609)258-6469