On Mon, Aug 13, 2007 at 07:09:40AM -0400, Morrison, Tom wrote: > >> In order to debug the kernel 2.6, I want setup serial port with > >> UART on mpc85xx as early as possible. I add the register access > >> code at the beginning of platform_init(). For example, I try > >> to write THR register(0xe0004500). However the system just > >> hanging there with this line.
Make sure there's a mapping in the TLB for that address. > FWIW, you really can't debug the earliest init code > because most of that is in assembly. Get a JTAG emulator > (BDI or Lauterbach) and start stepping through. It's quite possible to debug assembly code without JTAG. :-) -Scott _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
