Lpc2000

Tom Walsh wrote:

>  I dragged out my old wiggler clone and tried the gdb-jtag-arm working.
>  It does connect to the ARM7TDMI cpu and identifies it as an ARM7TMDI.
>  But the gdb-remote won't work with the ARM7 processor.  No register are
>  dumped. I tried with the jtag-arm tool and it comes back with all
>  registers as 0xffffffff.
>
>  I'm sure it prolly has something to do with the length of the SCANCHAIN
>  between an ARM9TDMI vs ARM7TDMI.  It was interesting to tinker with, but
>  I went back to my other unit (BDI2000).

Not only may the length of the scan chain differ, the depth of the
prefetch buffer is different which will result in wrong data returned
(reading at the wrong clock tick on the data bus).

Defenitely a nice starting point for someone who starts writing his/her
own JTAG arm7tdmi-s code.

Please note: the scan chains for the ARM7TDMI and the 7TDMI-S are
different...

Regards,

     Rob