Peter Korsgaard wrote:
Olof> 1. There's no early boot console support for PPC. There's another
Olof> uartlite patch that's floating around that has this, very useful for
Olof> early bringup tasks. I'd like to see this expanded to include that as
Olof> well (the regular part of the other driver seems more or less broken
Olof> though, so this is a better base driver). That shouldn't stop this part
Olof> of the driver to go in though, just possible future work.
There is more than one UartLite driver. I have one from someone else
that includes DCR support.
I wrote one that includes early boot console support - which is
fairly trivial.
I will try to separate out my early boot console patches - would
this be the appropriate place to post them ?
I beleive my driver is the one Peter believes is broken.
True. The board I have an uartlite on also has a 8250 so it hasn't
been an issue for me so far - But it would indeed be a nice
addition. Adding new stuff to arch/ppc at this moment isn't that
sensible, so perhaps it makes most sense to wait til 4xx is supported
under arch/powerpc?
I can't quite understand why one would build a Xilinx FPGA with both.
Olof> 3. It would be useful to demonstrate how to hook up the device all the
Olof> way through to the board port (i.e. add a config option and include it
Olof> in the ml403 platform code or similar). It's not hard, but it'd make it
Olof> easier for whomever comes next. Of course, with 4xx hopefully soon
Olof> moving over to arch/powerpc, this would be taken care of through the
Olof> device tree instead.
Yes - Afaik none of the Xilinx boards comes with uartlites
configured so it's not usable out-of-the-box, but you can ofcause do a
setup with the proper #ifdefs like the 8250 stuff in virtex.c.
If Peter's driver is likely to get accepted I have all of the
platform device code done for my own driver I can move it to his.
I did a BSP for the Pico E12/E14, they use either UartLite out of
the box, or a pseudo serial device they call the Keyhole
that can be used if the E12/E14 are hosted (they are CF/Cardbus
cards respectively)
--
Dave Lynch DLA Systems
Software Development: Embedded Linux
717.627.3770 dhlii@xxxxxxxxxx http://www.dlasys.net
fax: 1.253.369.9244 Cell: 1.717.587.7774
Over 25 years' experience in platforms, languages, and technologies too numerous to list.
"Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction."
Albert Einstein
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