[9fans] Unable to find South Bridge

[9fans] Unable to find South Bridge

[Venkatesh Srinivas]

Hiya 9fans!

I tried to install Plan 9 today on a Dual Athlon system, with a Tyan Tiger
MP mainboard. It is unable to detect any hard drives attached to the
system's primary IDE channel. This behavior exists whether DMA is either on
or off.

During boot, I get:

pcirouting: South Bridge FFFF, FFFF not found

and later:

pcirouting: Cannot find south bridge PCI.255.31.7

Do any of you know what might be going on? Any suggestions as to how I might
get Plan 9 going on this hardware?

Thanks,
-vs

Re: [9fans] Unable to find South Bridge

[erik quanstrom]

> During boot, I get:
>
> pcirouting: South Bridge FFFF, FFFF not found
>
> and later:
>
> pcirouting: Cannot find south bridge PCI.255.31.7
>
> Do any of you know what might be going on? Any suggestions as to how I might
> get Plan 9 going on this hardware?
>

i don't think the problem is your south bridge.  very few
of them need to be recognized, so they aren't.  the problem
is likely that you need the vid/did of the ide controller in
your motherboard added to the ata driver.  if you have
a system on which you can compile a kernel, try applying
this diff

; diffy -c /sys/src/9/pc/sdata.c
/n/dump/2008/0229/sys/src/9/pc/sdata.c:1960,1965 - /sys/src/9/pc/sdata.c:1960,1968
  			r = pcicfgr8(p, 0x46);
  			pcicfgw8(p, 0x46, (r & 0x0C)|0xF0);
  			/*FALLTHROUGH*/
+ 		case (0x7401<<16)|0x1022:	/* AMD 755 Cobra */
+ 		case (0x7409<<16)|0x1022:	/* AMD 756 Viper */
+ 		case (0x7410<<16)|0x1022:	/* AMD 766 Viper Plus */
  		case (0x7469<<16)|0x1022:	/* AMD 3111 */
  			/*
  			 * This can probably be lumped in with the 768 above.

if you don't contact me offline and we'll figure something out.

- erik

[9fans] Unable to find South Bridge

[Akshat Kumar]

I have an Intel P55C MMX (233 MHz), with the same
problem as that given here:
http://9fans.net/archive/2008/02/858

However, I'm trying to boot off the Plan 9 CD, and
don't currently have a way of compiling a kernel
with the suggested changes (or booting from it).
(Also, I think those changes are perhaps for
a different system?)

Any help appreciated.


Thanks,
ak