Re: Au1500 and TI PCI1510 cardbus

[Sergei Shtylyov <sshtylyov@ru.mvista.com>]

Hello.

Marco Braga wrote:

>> > I think I'm beginning to make a lot of confusion. Is the problem that
>> the
>> > PCI1510 must NOT be behind a bridge, or the problem is that PCI1510 
>> acts
>> as
>> > a bridge, so cardbus cards cannot work?

>>     The second.

> Ok, at the risk of appearing totally dumb, I'll double check.. If the 
> second
> ic correct, PCI1510 is a bridce, a cardbus card cannot work.

    Yeah. Note that it's not totally broken -- you just can't use the "decent" 
devices on it, i.e. ones with bus mastering.

>>    You can see yourself that PCI1510 is a bridge (Cardbus-to-PCI bridge is
>> largely the same as PCI-to-PCI bridge).

> Ok.

    Yeah, that's an importnat point.  AMD docs don't say about CardBus 
bridges, So, it was probably obvious to me only. :-)

>> So it seems that the 3Com card is behind a bus. Should this work? From
>> what
>> > I've understood, it should now work..

>>     Think again. :-)

> Ok, that's a typo :-) It should NOT work. Is this better?

>   Sounds like what's been told in the errata 32.

> It seems that  Au1500 slowly faded into the shadows. Now it is owned by
> Raza, but there is no sign of an errata document, perhaps I've lost the
> magic moment when a lot of documentation was available.

    The errata has been available only from the AMD's developer site.

> But still, the question remains: how can Takeyoshi's "Ricoh CardBus Bridge"
> work with a cardbus card if bridges cannot work with Au1500's PCI?

> Scrub scrub..

WBR, Sergei