Hello, I want to modify U-boot to relocate itself to on-board SRAM of chip (T1042 demo board) instead of DRAM.
At first, there is call list in u-boot/common/board_f.c and it has a line to call dram_init. I will change this line with my custom sram_init function. [image: Capture.PNG] The function board_f() is being called in start.S which is located at u-boot/arch/powerpc/cpu/mpc85xx/ start.S file also includes a region to relocate itself by changing Link Register. Code region is: */** ** void relocate_code(addr_sp, gd, addr_moni)* *** ** This "function" does not return, instead it continues in RAM* ** after relocating the monitor code.* *** ** r3 = dest* ** r4 = src* ** r5 = length in bytes* ** r6 = cachelinesize* **/* *.globl relocate_code* *relocate_code:* *mr r1,r3 /* Set new stack pointer */* *mr r9,r4 /* Save copy of Init Data pointer */* *mr r10,r5 /* Save copy of Destination Address */* *GET_GOT* *#ifndef CONFIG_SPL_SKIP_RELOCATE* *mr r3,r5 /* Destination Address */* *lis r4,CONFIG_SYS_MONITOR_BASE@h /* Source Address */* *ori r4,r4,CONFIG_SYS_MONITOR_BASE@l* *lwz r5,GOT(__init_end)* *sub r5,r5,r4* *li r6,CONFIG_SYS_CACHELINE_SIZE /* Cache Line Size */* My question is, in above code, how relocate_code() function is calculating the jump address of Link Register (CONFIG_SYS_MONITOR_BASE@h). What should be done to change it to point SRAM of t1042 after we initialize it in board_init_f() function. ? Thanks.
