Hi!

I would like to port the U-Boot to a custom developed port with an Au1200 chip. I'm using the ELDK as toolchain. I successfully compiled the U-Boot. I'm trying to debug it with a BDI-3000, through GDB. But anywhere I put a breakpoint (e.g. to the board_init_f), the program stops at line 234 in the start.s: mtc0 zero, CP0_WATCHLO, and it writes out:

Program received signal SIGABRT, Aborted. reset () at start.S:234 234 mtc0 zero, CP0_WATCHLO

After I continue program running, the BDI writes out:

*** TARGET: all hardware breakpoints in use

and the gdb:

(gdb) c Continuing. Warning: Cannot insert breakpoint 2. Error accessing memory address 0xbfc01030: Unknown error 4294967295.

Contrarily, I can use the BDI's TI command, so from terminal, I can single step the program. Any idea?

Here's the full gdb output:

(gdb) target remote bdi:2001 Remote debugging using bdi:2001 _start () at start.S:64 64 RVECENT(reset,0) /* U-boot entry point */ (gdb) b board_init_f Note: breakpoint 2 also set at pc 0xbfc01030. Breakpoint 3 at 0xbfc01030: file board.c, line 202. (gdb) c Continuing.

Program received signal SIGABRT, Aborted. reset () at start.S:234 234 mtc0 zero, CP0_WATCHLO (gdb) c Continuing. Warning: Cannot insert breakpoint -5. Error accessing memory address 0xbfc00000: Ismeretlen hiba 4294967295.