Dear John,
in message 001d01c31902$4c141780$844da93d@john you wrote:
I've checked the archives, but have not found anyone using the 860 with my problem.
I have a MPC860 board ported from FADS860 board. ( TEXT_BASE is also 0x2800000, but IMMR is 0x2200000). I have vxworks run OK on it. But when I am porting
Don;t do thiis. There is good reason NOT to chose an IMMR address below 0xF0000000 - at least if you intend to run Linux one day.
For Example as following: (ELDK1.0 + U-boot-0.3.0)
located in /cpu/mpc8xx/start.S .globl _start .extern testLed _start: lis r3, 0x220 /* my IMMR addr is 0x2200000 */ ori r3, r3, 0x0000 mtspr 638, r3 /*IMMR SPR is 638*/
bl testLed /* this is to light LEDs on board(PA0 - PA3)*/
located in /cpu/mpc8xx/cpu_init.c void testLed(void) { int i,k; for(k=0;k<5;k++) {
This cannot work. You added your code much too early, where no stack has been set up yet.
My recommendation is not to change cpu/mpc8xx/start.S if you don't know EXACTLY what you are doing. If you want to insert your own debug code written in C, then you cannot do this before the comment reading "let the C-code set up the rest" (but then you can alos include your code in cpu_init_f().
Also, you should get yourself a BDI2000 so you can debug your system.
Best regards,
Wolfgang Denk