how to debug u-boot with bdm4gdb

since after boot all the registers of mpc860( im using mpc860) is initialized by u-boot
but bdm4gdb also initialize the register,

so how to use bdm4gdb to debug the u-boot??

U-Boot does not initialize _all_ registers, only those it really needs to.

BDm4GDB also initializes only the registers you tell it in the init script.

Modify your init script for BDM4GDB to initialize only those registers you really need, and/or those that don't cause conflicts with U-Boot. For a start, just initialize SYPCR (to turn off the watchdog), and nothing else.

Best regards, and a Happy New Year!

Wolfgang Denk

Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
"One thing they don't tell you about doing  experimental  physics  is
that sometimes you must work under adverse conditions... like a state
of sheer terror."                                    - W. K. Hartmann