Xilinx IP core drivers for RTEMS- Keith Robertson still around?
Robert S. Grimes
rsg at alum.mit.edu
Tue Jul 18 15:42:39 UTC 2006
I'm in the same boat as you. Keith has sent me his diffs, which I
include here. Note that they are against a little older version
(V4.6.5) of RTEMS, and should work on a suitably configured Xilinx ml403
board. You'll have to make sure your V4 configuration is compatible
with his stuff, or change one side or another...
Be forewarned - things are much more tricky here in V4 land. Because of
the flexibility of the V4, you have many more variables. When I used
Keith's work, the simplest RTEMS application simply worked! However, in
looking at things afterwards, I realized how random that was...
I started with the Xilinx ml403 development/evaluation board. As
delivered, it is a pretty full-fledged configuration designed to show
off all the V4 and ml403 features. One thing I noticed early on is that
some of the IP used in that configuration, specifically the serial port
and the Ethernet MAC, would cost extra (iirc, $2K for the serial port,
and $5 for the MAC). I sure didn't feel like paying $2K for a console
port! Fortunately, the provide the uart lite component, so I did the
necessary substitution. Here is where the randomness kicks in - for
whatever reason, Keith had done the same, so lo and behold, things worked!
It gets more complicated, however. For me, I can't justify spending $5K
for a core that takes up 25% of the FPGA fabric, /especially when there
are two hard TEMACs on the darn chip to begin with/! (I'm still a bit
hot under the collar about how difficult getting the TEMAC up has been,
especially because one would reasonably had assumed that such a
highly-touted feature would have been demonstrated in an evaluation
board!!!) So I'll have to modify what Keith has done anyway to use the
Anyway, I've been off it for a little while, but will be picking up
steam again, especially after my design review on this project August
1&2, so if interested, we can perhaps help each other a bit. Be
forewarned, I'm a novice with RTEMS, though I won't be for much longer...
Attached is his diff against a clean 4.6.5 - here are his comments
Here's the diff's against a clean 4.6.5. I've had to manually edit
the output of my svn diff command to only get changes specific to
the gen405 drivers I've spoken about. I believe it should work though.
All changes are made available under the standard rtems license (ie
GPL plus rtems exception).
The main changes are the following:
Xilinx opb interrupt controller:
Xilinx uart lite driver:
Xilinx ethernet driver:
There are three other types of changes:
1) Makefile.am changes to make the whole thing compile
2) A few changes that were spoken about on the mailing list in July
(essentially bugs in the gen405 port AFAICT).
3) Bsp startup / connection to driver files
gregory.menke at gsfc.nasa.gov wrote:
> This message is directed to Keith Robertson with regard to a message on
> the rtems mail list in Dec 2005 where he indicated he had some RTEMS
> code written to support Virtex-4 PPC hardware, specifically the
> interrupt controller, uart & ethernet. If possible, I'd like to get
> copies of the code since we have a high priority effort underway using
> those parts, and RTEMS is the OS.
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