Hi. I am at early stages of board bring-up. The board uses Freescale 8541 platform.
On function call of one of the first functions, the stack pointer (stored in r1) gets corrupted.
I tried a couple of things, but I still don't get what is going on there. Advise will be very much appreciated (what can be the problem and what should I check). See some details below:
I use L1 data cache RAM for global data and stack, with the configuration described below. I use ELDK 4.0, U-boot 1.1.6. The problem I face is as following: When running board_init_f code, seems like the stack pointer (stored in r1) gets corrupted. When going through the for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr), after returning from board_early_init_f, the return address is some random value. I tried following: 1. change CFG_INIT_SP_OFFSET to CFG_INIT_SP_OFFSET - X for various X-s. Result: I get through the first (few) function(s), but eventually get the stack pointer corrupted again. 2. put the memset under comment. Result: I get through the first function, but don't get back from the next one.
Board configuration: ************************************************ #define CONFIG_L1_INIT_RAM #define CFG_INIT_RAM_LOCK 1 #define CFG_INIT_RAM_ADDR 0xe4010000 /* Initial RAM address */ #define CFG_INIT_RAM_END 0x4000 /* End of used area in RAM */ #define CFG_L2_SRAM_BASE 0xDF000000
#define CFG_GBL_DATA_SIZE 128 /* num bytes initial data */ #define CFG_GBL_DATA_OFFSET (CFG_INIT_RAM_END - CFG_GBL_DATA_SIZE) #define CFG_INIT_SP_OFFSET CFG_GBL_DATA_OFFSET *************************************************** Below is the relevant piece of code: ************************************************************* void board_init_f (ulong bootflag) { bd_t *bd; ulong len, addr, addr_sp; ulong *s; gd_t *id; init_fnc_t **init_fnc_ptr; #ifdef CONFIG_PRAM #endif
/* Pointer is writable since we allocated a register for it */ gd = (gd_t *) (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET); /* compiler optimization barrier needed for GCC >= 3.4 */ __asm__ __volatile__("": : :"memory");
#if !defined(CONFIG_CPM2) /* Clear initial global data */ memset ((void *) gd, 0, sizeof (gd_t)); #endif
for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) { if ((*init_fnc_ptr) () != 0) { hang (); } } *************************************************************
Thanks for your help