Dear Jerry,
in message 008601c104f4$1630e900$1c0114ac@jerry you wrote:
I port the ppc linux to a 860 processor card . I download it into
the flash, and reboot, it works very well.
But when I use a BDM emulator (Macraigor Wiggler) to debug , it alwary
AFAIK the Wiggler does not suport the MMU, so it won't be any help as
soon a s Linux is running, but you are probably aware of this, and in
any case the system should not crash like your's.
I do not do anythings else, just put the PC on reset vector, and go. No any
breakpoints or watchpoints set. The PC will be 0x3xxx .
I don't know how to configure the Wiggler. but you _have_ to do a few
preparations to run Linux: you have to turn off the 8xx internal
watchdog, and you have to configure the DER (Debug Event Register) to
a value that does not jump into BDM mode during normal Linux
operation - 0x2002000F is a good value.
Is there anyone can give me a hand.
You should consider to switch to a BDM debugger with better Linux
support; I recommend the BDI2000 by Abatron if you're looking for a
commercial tool (about $2200), or the BDM4GDB parallel port adapter
(which you can either build yourself or buy for $50). Both have full
MMU support and interfaces to GDB, so they integrate smoothly into a
Linux based development environment.
Wolfgang Denk
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