after mips_cache_reset, when i set config as CONF_CM_CACHABLE_NONCOHERENT, the copy u-boot to sdram in relocate_code will not succeed, for every 16 bytes, it only last 4 bytes be correct.

but if i set CONF_CM_CACHABLE_NO_WA after mips_cache_reset, the copy function will work well.but after that, when run in ram, in the line to get u_boot_end label, it can't get the correct value, if i step in with BDI2000, it can run to

la t9,board_init_r jr t9

but the t9 still keep the value (0xbfcxxxx, which was loaded by la t9, board_init_f j t9)

and if i add sync before la t9, board_init_f, it can run into board_init_f, but it load the c functions address not correctly

my questions

1) what the CP0_CONFIG need to set for cache (my core is 4KEC)? 2) i see before the jump to in_ram, there is some comment as follow:

.......... /* If caches were enabled, we would have to flush them here. */

/* Jump to where we've relocated ourselves. */ addi t0, a2, in_ram - _start j t0 nop

does it means if i used mips_cache_lock before, i need to add flush code here ?