[Gumstix-users] Reflashing u-boot with JTAG ...

[Jony H. <gu...@j-...>]

Hi,

  I'm trying to reflash u-boot onto my gumstix (a connex 200 xm) using 
JTAG. I'm having a few problems and was hoping somebody could let me 
know where I'm going wrong :-)

My understanding is that the procedure is: initialise chip, download 
u-boot to memory, and execute over JTAG. Come into u-boot over the 
serial port (I didn't see this written down anywhere, but it's my only 
guess) and use u-boot to flash u-boot onto the gumstix.

I can connect to the board over JTAG (using a wiggler knock-off and OCD 
Commander). I can download a u-boot srecord using the script on the JTAG 
wiki page. But then nothing ! Should I expect to see something on the 
serial port (the same one that I'd normally see the console on if 
everything was well) ? [I've peeked at the outgoing serial port line 
with a scope and saw nothing, so it's not as simple as misconfigured 
serial IO.]

I'm using a u-boot srecord generated by 'make'ing the buildroot. I've 
also tried with an srecord that I made from the latest u-boot .bin on 
the sourceforge page (made with 'arm-linux-objcopy 
u-boot.bin.r563-200MHz u-boot.srec -I binary -O srec 
--adjust-vma=0xa3f00000').

Any ideas welcome ? Does the 'boot script' perhaps need to be changed 
for xm's ? <Insert more random speculation...>

Once again, many thanks in advance,


Jony