RE: below 1M BAR behind a PCI-PCI bridge

[Lame Brooks-G14738 <Brooks_Lame@mcg.mot.com>]

You can grant the below 1MB request behind a generic bridge, but the bridge
will not be able to pass up-stream (primary side) transactions below 1MB to
the down-stream (secondary side) device(s) because a generic P2P bridge does
not support a memory window below 1MB.    However, you should be able to
pass transactions from the secondary side to the primary side.  
-- BrooksL

> -----Original Message-----
> From: Benedict Chong [mailto:bensbrain@hotmail.com]
> Sent: Tuesday, 26 October, 1999 16:32
> To: Mailing List Recipients
> Subject: Card behind a PCI-PCI bridge
> 
> 
> Hi folks,
> 
> I'm new to the list.
> 
> I have a PCI card that requires 32-bit memory resources, I/O 
> resources and a 
> range of below 1Meg memory resources (bit 1 in BAR is set).
> 
> If I put this card behind a generic PCI-PCI bridge, how do I 
> program/configure the bridge so that I can allocate the 32-bit memory 
> resources as well as the below 1Meg memory resources?
> 
> The may be other cards behind this bridge too.
> 
> Thanks in advance for any inputs.
> 
> Benedict
> 
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