[Etherboot-developers] Re: [Etherboot-users] pci.c patch

[<ebi...@ln...>]

Ken Yap <ke...@bi...> writes:

> Finally I got around to looking at Steve Smith's patch for PCI-PCI
> bridges. Here's the patch. Could people who are having problems with
> NICs not on PCI bus 0 please try this to see if it helps?

For the last case reported on this list, this code won't solve it.
The problem there was serverworks has 2 parrallel pci buses.  I'm
not certain if they are even bridged.

Unless there is a performace problem setting busses = 256, and
scanning all potential PCI busses should be much more reliable.

I wish I had the time at the moment to test it...

Eric


> 
> --- etherboot-5.0.1/src/pci.c	Mon Apr  2 19:00:04 2001
> +++ etherboot-5.0.2/src/pci.c	Wed May 16 02:19:17 2001
> @@ -385,7 +385,16 @@
>  			pcibios_read_config_byte(bus, devfn, PCI_CLASS_CODE,
> &class);
> 
>  			pcibios_read_config_byte(bus, devfn, PCI_SUBCLASS_CODE,
> &subclass);
> 
>  			if (class == 0x06 && subclass == 0x04)
> +			{
>  				buses++;
> + /* Some BIOS's seem to configure the bridge with a gap in PCI bus numbers */
> 
> +				if (hdr_type == 0x01) /* PCI-PCI Bridge 1.1 */
> +				{
> + pcibios_read_config_dword(bus, devfn, PCI_BASE_ADDRESS_2, &ioaddr);
> 
> +					if (((ioaddr>>16) & 0xff) > buses)
> +						buses = (ioaddr>>16) & 0xff;
> +				}
> +			}
>  
>  #if	DEBUG
>  			printf("bus %x, function %x, vendor %x, device %x\n",
> 
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