On Nov 22, 2015 12:13 PM, "Bharath R" <[email protected]> wrote: > > 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)?
This is a standard procedure for u-boot, why don't you go ask them... Regards, -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
