移植 u-boot-1.1.6 到 FL2440(1)---實現基本功能
阿新 • • 發佈：2019-02-07
/* Set up the stack */
stack_setup:
ldrr0, _TEXT_BASE/* upper 128 KiB: relocated uboot */
subr0, r0, #CFG_MALLOC_LEN/* malloc area */
subr0, r0, #CFG_GBL_DATA_SIZE /* bdinfo */
#ifdef CONFIG_USE_IRQ
subr0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ)
#endif
subsp, r0, #12/* leave 3 words for abort-stack */
#ifndef CONFIG_SKIP_LOWLEVEL_INIT
bl clock_init/* ³õʼ»¯Ê±ÖÓƵÂÊ */
#endif
#ifndef CONFIG_SKIP_RELOCATE_UBOOT
relocate:/* relocate U-Boot to RAM */
adrr0, _start/* r0 <- current position of code */
ldrr1, _TEXT_BASE/* test if we run from flash or RAM */
cmp r0, r1 /* don't reloc during debug */
beq clear_bss
ldrr2, _armboot_start
ldrr3, _bss_start
subr2, r3, r2/* r2 <- size of armboot */
#if 1
blCopyCode2Ram/* r0:source, r1:dest, r2:size */
#else
addr2, r0, r2/* r2 <- source end address */
copy_loop:
ldmiar0!, {r3-r10}/* copy from source address [r0] */
stmiar1!, {r3-r10}/* copy to target address [r1] */
cmpr0, r2/* until source end addreee [r2] */
blecopy_loop
#endif
#endif/* CONFIG_SKIP_RELOCATE_UBOOT */
clear_bss:
ldrr0, _bss_start/* find start of bss segment */
ldrr1, _bss_end/* stop here */
mov r2, #0x00000000/* clear */
clbss_l:strr2, [r0]/* clear loop... */
addr0, r0, #4
cmpr0, r1
bleclbss_l
SetLoadFlag:
/* Set a global flag, PreLoadedONRAM */
adrr0, _start/* r0 <- current position of code */
ldrr1, _TEXT_BASE/* test if we run from flash or RAM */
cmp r0, r1 /* don't reloc during debug */
ldr r2, =PreLoadedONRAM
mov r3, #1
streq r3, [r2]
stack_setup:
ldrr0, _TEXT_BASE/* upper 128 KiB: relocated uboot */
subr0, r0, #CFG_MALLOC_LEN/* malloc area */
subr0, r0, #CFG_GBL_DATA_SIZE /* bdinfo */
#ifdef CONFIG_USE_IRQ
subr0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ)
#endif
subsp, r0, #12/* leave 3 words for abort-stack */
#ifndef CONFIG_SKIP_LOWLEVEL_INIT
bl clock_init/* ³õʼ»¯Ê±ÖÓƵÂÊ */
#endif
#ifndef CONFIG_SKIP_RELOCATE_UBOOT
relocate:/* relocate U-Boot to RAM */
adrr0, _start/* r0 <- current position of code */
ldrr1, _TEXT_BASE/* test if we run from flash or RAM */
cmp r0, r1 /* don't reloc during debug */
beq clear_bss
ldrr2, _armboot_start
ldrr3, _bss_start
subr2, r3, r2/* r2 <- size of armboot */
#if 1
blCopyCode2Ram/* r0:source, r1:dest, r2:size */
#else
addr2, r0, r2/* r2 <- source end address */
copy_loop:
ldmiar0!, {r3-r10}/* copy from source address [r0] */
stmiar1!, {r3-r10}/* copy to target address [r1] */
cmpr0, r2/* until source end addreee [r2] */
blecopy_loop
#endif
#endif/* CONFIG_SKIP_RELOCATE_UBOOT */
clear_bss:
ldrr0, _bss_start/* find start of bss segment */
ldrr1, _bss_end/* stop here */
mov r2, #0x00000000/* clear */
clbss_l:strr2, [r0]/* clear loop... */
addr0, r0, #4
cmpr0, r1
bleclbss_l
SetLoadFlag:
/* Set a global flag, PreLoadedONRAM */
adrr0, _start/* r0 <- current position of code */
ldrr1, _TEXT_BASE/* test if we run from flash or RAM */
cmp r0, r1 /* don't reloc during debug */
ldr r2, =PreLoadedONRAM
mov r3, #1
streq r3, [r2]