Hi,
As per my knowledge, MLO(SPL) does basic operation like clock
configuration, initialization of external eMMC, ext RAM and copy the u-boot
image from eMMC to RAM(DDR3) and jumps to RAM locate where it has copied
the u-boot.
But the u-boot startup code seems to mislead me.
Here is the code of u-boot start.S:
#ifndef CONFIG_SKIP_RELOCATE_UBOOT
relocate: /* relocate U-Boot to RAM
*/
adr r0, _start /* r0 <- current position of code
*/
ldr r1, _TEXT_BASE /* test if we run from flash or RAM
*/
cmp r0, r1 /* don't reloc during debug
*/
beq stack_setup
ldr r2, _armboot_start
ldr r3, _bss_start
sub r2, r3, r2 /* r2 <- size of armboot
*/
add r2, r0, r2 /* r2 <- source end address
*/
copy_loop:
ldmia r0!, {r3-r10} /* copy from source address [r0]
*/
stmia r1!, {r3-r10} /* copy to target address [r1]
*/
cmp r0, r2 /* until source end addreee [r2]
*/
ble copy_loop
#endif /* CONFIG_SKIP_RELOCATE_UBOOT */
why is u-boot's start.S copying itself to ext RAM(DDR3)?
Regards,
Bharath
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