Lpc2000

>     Does anyone know the proper way of exit from debug state to the thumb
>  running state? This is not described in any available arm documents.

The way you describe it in your previous mail sounds good:

>  > When I exit from debug state:
>  > 10. restore r1 to r15 (arm instruction - r15 is modified to reflect
>  > correct address after 12)
>  > 11. restore cpsr
>  > 12. restore r0 (arm or thumb instruction)

The only question is what will happen with the content of r15 during steps
11 and 12 (the LSB must stay 1 in order to jump to thumb mode).

I have not even reached thumb mode yet, I have some problems reading
registers after execution of a system speed LDR r1,[r0]. It seems the
RESTART has some side effects such that I am not able to do normal CPU
register reads anymore (reading the ICE registers looks Ok so scanchain
works).

I have planned to do some monitoring on the JTAG signals of a working JTAG
pod. I will also look at thumb at that time and keep you informed.

Regards,

    Rob