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Blackfin: clarify relocation comment during init

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People often ask questions about the init process and when things go
from flash to relocated base, so clarify the comments a bit.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2008-10-11 21:40:26 -04:00
parent 95433f6d43
commit b5eba3fafc
1 changed files with 7 additions and 3 deletions
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10
cpu/blackfin/start.S
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@ -125,9 +125,11 @@ ENTRY(_start)
*/
r6 = 1 (x);
/* Relocate from wherever are (FLASH/RAM/etc...) to the hardcoded
/* Relocate from wherever we are (FLASH/RAM/etc...) to the hardcoded
* monitor location in the end of RAM. We know that memcpy() only
* uses registers, so it is safe to call here.
* uses registers, so it is safe to call here. Note that this only
* copies to external memory ... we do not start executing out of
* it yet (see "lower to 15" below).
*/
serial_early_puts("Relocate");
call _get_pc;
@ -172,7 +174,9 @@ ENTRY(_start)
* setting the 15 handler to ".Lenable_nested", raising the 15
* interrupt, and then returning from the highest interrupt
* level to the dummy "jump" until the interrupt controller
* services the pending 15 interrupt.
* services the pending 15 interrupt. If executing out of
* flash, these steps also changes the code flow from flash
* to external memory.
*/
serial_early_puts("Lower to 15");
r0 = r7;