On Sun, 01 Apr 2007 00:26:19 +0200
Robert Staven <robert@stopthespam_remove.staven.no> wrote:

It's probably basic knowledge, but I still having trouble figure it 
out.... anyway:

Working with a SCC in a CPM (MPC8250 running linux 2.6.13-AM)

I need to place Buffer Descriptors (BD) in the Dual-Port RAM (DPRAM) 
somewhere....
But two FCCs, SMC1 and SCC1 are in use, and they might use some part of 
the DPRAM.

... cpm_dpalloc() will work for you I guess.

Is there any way to figure out what part of the DPRAM thats free?
And how to reserve the part I need?

Robert

(SCC3 parameter RAM are at 0x8200 in DPRAM so I just place a struct 
there and assume that linux stays away from this memory area and don't 
get mad cause I use it without allocating it. Or have I got this wrong to?)

I'd suggest to look at the implemented 8260-like stuff and platform device approach (syslib/pq2_devices.c). Whole immr including DPRAM are is io_block_mapped early by the platform code so
you can do stuff in brackets I guess, but that might look weird and be more complex to debug.

Thanks.

-- 
Sincerely, 
Vitaly