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hardwaremain: Move init_timer() call to before console init 

The 8250 MMIO uart driver calls udelay, and if that is the first
call then it will also call printk in init_timer() which can result
in a deadlock trying to acquire the console lock.

There are a few options to prevent this:
1) remove the printk in init_timer which removes a useful debug message
2) change the udelay() to cpu_relax() in uart8250mem.c
3- move the init_timer() call in ramstage main() to be called earlier

Since hardwaremain.c:main() already has an explicit call to init_timer()
on x86 it is an easy change to move this to happen before the console
is initialized.

BUG=chrome-os-partner:40857
BRANCH=none
TEST=boot on glados with serial output through ramstage

Change-Id: I8a8d8cccdd0b53de9de44600076bfad75e4f5514
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 744610f72628a944582925933b286f65bde630d9
Original-Change-Id: Ic1fdafaea5541c6d7b1bb6f15399c759f484aa74
Original-Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/275157
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/10698
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)
This commit is contained in:
Duncan Laurie 2015-06-04 08:42:48 -07:00 committed by Patrick Georgi
parent fbc45a60eb
commit a51815119f
1 changed files with 5 additions and 4 deletions
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9
src/lib/hardwaremain.c
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@ -432,6 +432,11 @@ static void boot_state_schedule_static_entries(void)
void main(void)
{
/* TODO: Understand why this is here and move to arch/platform code. */
/* For MMIO UART this needs to be called before any other printk. */
if (IS_ENABLED(CONFIG_ARCH_X86))
init_timer();
/* console_init() MUST PRECEDE ALL printk()! Additionally, ensure
* it is the very first thing done in ramstage.*/
console_init();
@ -463,10 +468,6 @@ void main(void)
/* Schedule the static boot state entries. */
boot_state_schedule_static_entries();
/* TODO: Understand why this is here and move to arch/platform code. */
if (IS_ENABLED(CONFIG_ARCH_X86))
init_timer();
bs_walk_state_machine();
die("Boot state machine failure.\n");