[E3-hacking] Re: E2 PBL bios dump.

Ralph Corderoy e3-hacking@earth.li
Fri, 11 Feb 2005 13:00:39 +0000

Hi en4rab,

> If the E3 behaves like the E2 did it will have its WDT enabled and
> locked  so about 4 or 5 seconds after you halt the CPU the WDT will
> time out and reset the box

Code to reset the watch-dog's timer writes 0x0000a5a5 to 0xffff8004.

    e3a0c9fe  mov r12, #&3f8000
    e24cc501  sub r12, r12, #&400000     # r12 = 0xffff8000 = WDT.
    e3a030a5  mov r3, #&a5
    e2833ca5  add r3, r3, #&a500         # r3 = 0xa5a5.
    e58c3004  str r3, [r12, #4]          # wdtcntr.

Presumably, something similar could be done with JTAG to disable the WDT