Stefan Reinauer (stefan.reinauer@coreboot.org) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/1267
-gerrit
commit d74f2d22cc0c7c9d72be2fdf329baf44dbbbdb21 Author: Stefan Reinauer reinauer@chromium.org Date: Tue Jul 10 15:19:23 2012 -0700
Re-initialize Local APIC timer on APs
In order to be able to use udelay in code running on AP cores the timer has to be initialized on the according local APICs or the system will just hang when udelay is used.
Change-Id: I776bc96aa6d876ff2582d0c05cbc9c7611cb06b5 Signed-off-by: Stefan Reinauer reinauer@google.com --- src/cpu/x86/lapic/apic_timer.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/src/cpu/x86/lapic/apic_timer.c b/src/cpu/x86/lapic/apic_timer.c index a4106d4..1fd0c60 100644 --- a/src/cpu/x86/lapic/apic_timer.c +++ b/src/cpu/x86/lapic/apic_timer.c @@ -79,7 +79,9 @@ void udelay(u32 usecs) { u32 start, value, ticks;
- if (!timer_fsb) + if (!timer_fsb || (lapic_read(LAPIC_LVTT) & + (LAPIC_LVT_TIMER_PERIODIC | LAPIC_LVT_MASKED)) != + (LAPIC_LVT_TIMER_PERIODIC | LAPIC_LVT_MASKED)) init_timer();
/* Calculate the number of ticks to run, our FSB runs at timer_fsb Mhz */