---- Original Message ----
From: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
To: linuxppc-embedded@ozlabs.org
Sent: Friday, December 7, 2007 4:58:56 AM
Subject: Help with MPC5200 + Bestcomm + Local Plus Bus.... same problem [ifm
ScanMail: oK]
Hello Roger,
i have read your message. I have now the same problem. I use a CPLD on the
Local Plus Bus. The CPLD generates interrupts for the MPC5200B processor.
Because of the quick signals, i want to use the Bestcomm unit, to push the Data
( 3 x 16 bit register) directly into the memory. I use the same Kernel. It
would be nice, if you could help me, to program a linux driver for that. Or
maybe you have any examples. So looking forward for you reply. Thanks a lot for
your time.
best regards Jan Baldauf
------
Jan,
I never did get my FPGA driver working with the bestcomm unit. I ended up
doing a half-baked version where I would program the lpc to transfer the data
into the FIFO and generate an interrupt when it finished. I could then copy the
data quickly from the FIFO to memory (The FIFO interface is wider and faster
than my FPGA, so I do reduce processor loading somewhat over directly reading
the FPGA) That works OK for small data transfers, but is not optimal.
In the current mainline there is support for a "gen_bd" bestcomm task which I
presume is to be used for the purpose you imply. Perhaps somebody has an
example of using that?
good luck!
-rb
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