[Buildroot] How is the RM9200 status of buildroot ?
ulf at atmel.com
Wed Jan 9 18:26:37 UTC 2008
I would like to thanks you guys to point me to the right thing.
Here a little bit of information about our board.
CPU = RM9200
FLASH = AT49BV642D connected in a 16bit data bus
SDRAM = 2 x MT48LC8M16A2P-7E from Micron Technology. We have 2 SDRAM
connected in parallel with 16 bits databus. I think we based this design on
the dk board supplies by atmel.
Since a relatively new to all of the arm9 cpu + linux, I think I will have
some fun to get all of this working :)
I would like to know if it is possible to do some basinc testing on my board
to know if my memories setup is working correctly before going to far with
linux etc. ? I have acces to a jtag interface if this can help.
==> Traditionally, the process of getting an AT91RM9200 to run from a
parallel flash is to set BMS high to boot from the bootROM,
Download "loader.bin" using X-Modem to the internal SRAM,
"loader.bin" will start a new x-modem session and you use this
to download "boot.bin", which gets programmed into the first sector
of the parallel flash.
You will then program the u-boot.gz into a nearby sector of the flash.
After a reset, the board will execute "boot.bin" which will
decompress u-boot.gz into SDRAM and jump to the start of the U-boot.
You will need to check with your local contact to get source of "loader.bin"
and "boot.bin". They were originally compiled by gcc-2.95.3 and
using gcc-3.x.x does not work as far as I know.
I am not aware of anyone trying with gcc-4.x.x.
boot.bin/loader.bin binaries might work, but they were written for
the somewhat compatible AT49BV6416.
There is not a lot of support from Atmel on booting the AT91SAM926x chips
from a parallel flash, but many customers has succeeded in getting
them to run anyway.
Hopefully, next generation of AT91Bootstrap will support parallel flash,
but the AT91RM9200 is not supported at all by the bootstrap.
Why parallel flash in the first place???
Please be aware that the AT91RM9200DK has some critical flaws.
The AT91RM9200EK was designed to get rid of those flaws.
Again, discuss with your local Atmel FAE to have your schematics reviewed.
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