Jon,
RidgeRun SDK for DM355 currently uses his own bootloader: rrload (in
near future we will ship full u-boot support too).
rrload has his own UBL that is specifically designed for DM355 and you
can take a look on what needs to be implemented (I found that code
easier to read than uboot). However you will need to dig on the code
as we boundle the UBL to the bootloader image (so the bootloader can
save himself and the UBL on DM355), instead of using an app descriptor
as TI's UBL does.
On the SDK you will find also scripts to attach OCD to the DM355 and
the emulation settings required (anycase you can ask me).
Regards,
Diego Dompe
RidgeRun Engineering
On May 7, 2008, at 9:20 AM, Jon Povey wrote:
I have been trying to use Sergey's UBL on my DM355 EVM without
success.
As I read around more I am coming to the conclusion that most people
on
this mailing list, writing the wiki and writing open-source utilities
etc are using the DM64xx family. Also the word "davinci" is used to
mean
"DM64xx family". I am guessing that Sergey's UBL is written for the
DM64xx and that's why it doesn't run.
My plan is now to look at the sources for the TI DM355 UBL and those
of
Sergey's UBL, and play spot the difference in how it's talking to the
hardware. I'm intending to work on porting Sergey's bootloader to
DM355,
then look at modifying it to load from SD card which the DM355 RBL
supports. I would be interested in sharing this work with the
community
if I get anywhere.
I have a hardware JTAG device on the way to try and get me started
with
OpenOCD and GDB, but I haven't hacked boot loaders or ARM assembler
before and am generally in over my head :)
If anyone has any clues or could confirm my suspicions e.g. comments
like "yes we all use DM64xx, good luck modifying the UBL's", or even
better "here's an opensource DM355 UBL!" then I'd be glad to hear
them.
Thanks,
--
Jon Povey, Design Engineer
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