Re: Au1500 and TI PCI1510 cardbus

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

Hello.

Attila Kinali wrote:

>>To sum it up, Cardbus bridge is not a viable solution on Au1500 for
>>hotswapping devices, since any decent one (bus mastering) will not work.
>>USB2.0 should instead work with PCI based controllers, that must be
>>connected to the main PCI device (directly to Au1500).

> We are using a board with a Au1550 with cardbus (PCI1520) and
> USB2.0. The USB controller is directly connected to PCI.
> Although cardbus isn't fully tested yet, USB seems to work fine
> (atleast i haven't heard of any problems), but i don't know
> from the top of my head which chip they used.

> Also, the Au1550 doesn't seem to have the master-behind-bridge
> bug as the 1500 does (at least according to the datasheet),

    Reading revisions C and D of the Au1550 datasheet, I see:

4.3.9 System Considerations

The Au1550 PCI controller cannot be used with external PCI-to-PCI bridges that 
have PCI bus-mastering devices on the secondary bus which target the Au1550 
memory.

> so i guess cardbus should work also with "decent" cards :)

    OTOH, Au1550 errata I have is silent about the P2P bridges.

> HTH 
> 			Attila Kinali

WBR, Sergei