Re: Au1500 and TI PCI1510 cardbus

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

Marco Braga wrote:
>> I am sory, I meant the datasheet of the Au1500. I do not find the
>> paragraph anymore, but can tell you more on monday.

    I think Michael actually mean the specification update, not datasheet.
Indeed, errata 32

> Thank you. I've checked the data book but I've not found anything so
> explicit. Paragraph 4.3.10 "Other notes" states:

> "The Au1500 PCI contoller cannot be used with external PCI-to-PCI bridges
> that have PCI bus-mastering devices on the
> secondary bus which target the Au1500 memory."

> But this is not exactly an explanation.. I've found nothing regarding race
> conditions or delayed transactions. I'll wait eagerly for monday when all
> the truths will be revealed. :)

    Hrm, this seems enough of an explanation -- it basically says that you 
can't use any decent PCI device behind the bridge.  The abovementioned errata 
tells that "any mastering device on the other side of a P2P bridge, where the 
target is the Au1500 processor, will eventually lead to a lock-up condition of 
the PCI bus or even the entire system".

> Thanks!!

WBR, Sergei