On Sun, 01 Apr 2007 00:26:19 +0200 Robert Staven <[EMAIL PROTECTED]> 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 _______________________________________________ Linuxppc-embedded mailing list [email protected] https://ozlabs.org/mailman/listinfo/linuxppc-embedded
