CardBus support on G3 Blue&White

[Pavel Roskin]

On Sun, 23 May 2004, Russell King wrote:

[snip]
> So, we have:
>
>     bus 0-n       bus 1-1         bus 2-5
> HOST---------21154---------Cardbus---------Cardbus card
>
> where "bus A-B" means that the bus carries configuration cycles for
> bus numbers between A and B inclusive.  I think you can see the
> problem immediately from that - the 21154 is only programmed to
> forward configuration cycles for bus 1, but the cardbus card is
> on bus 2.  Configuration cycles for bus 2 will never reach the
> cardbus bridge let alone the cardbus card itself.

You are absolutely right.  The problem is fixed now.

> Please report this to the PowerPC people - its a PCI bus setup problem 
> not a Cardbus problem.  Maybe they can provide some input (and maybe 
> even say whether its possible to change the PCI bus configuration so it 
> actually works.)

I've posted a patch and got some positive feedback.  The patch is here:
http://www.red-bean.com/~proski/g3bw/bus_range_fixup.diff

Thank you!

-- 
Regards,
Pavel Roskin