hi,

i am developping a custom operating system for AT91RM9200-EK board. I am facing some problems using interrupts.

I cross-compile for ARM using ELDK and it works fine. I have succedeed in writing and running sample standalone application using DBGU, by configuring PIO and PDC.

I run my applications under u-boot, consequently i do not make low level inits any more (my startup.S file just branch at main). My apps are located at 20000000 (i.e. start of RAM)

I tried to configure interrupt handling mecanism in order to manage DBGU i/o under interrupt, but i do not succeeded. I used sample code found in romboot sources, especially asm_ir.S assembly interrupt handler, and the snippets that configure AIC and enable IT.

I ve searched for a long time, but i do not what happen. It seems that my interrupt handler is never called. May be something is missing in hw inits. Nevertheless I guess that applications running under u-boot may be able to handle interrupts.

If someone had such trouble or have a working example of code that use DBGU interrupts on top of u-boot, it would be very helpful for me.

Baz.