Hi!
I have compiled a little patch that contains the VIA timer bugfix (from the ac
kernel). the patch is against linus' 2.4.5 kernel. I have compiled and ran the patched
kernel sucessfully.
the only changes made by this patch are done to linux/arch/i386/kernel/timer.c
I would like to have this patch applied to linus' kernel tree (so that it comes in
2.4.6), because alan's kernel has USB problems on my machine.
Here's the patch:
--- arch/i386/kernel/time.c.orig Sat Jun 2 16:06:59 2001
+++ arch/i386/kernel/time.c Sat Jun 2 16:07:20 2001
@@ -178,6 +178,15 @@
jiffies_t = jiffies;
count |= inb_p(0x40) << 8;
+
+ /* VIA686a test code... reset the latch if count > max + 1 */
+ if (count > LATCH) {
+ outb_p(0x34, 0x43);
+ outb_p(LATCH & 0xff, 0x40);
+ outb(LATCH >> 8, 0x40);
+ count = LATCH - 1;
+ }
+
spin_unlock(&i8253_lock);
/*
@@ -413,7 +422,7 @@
if (!user_mode(regs))
x86_do_profile(regs->eip);
#else
- if (!smp_found_config)
+ if (!using_apic_timer)
smp_local_timer_interrupt(regs);
#endif
@@ -492,6 +501,24 @@
count = inb_p(0x40); /* read the latched count */
count |= inb(0x40) << 8;
+
+
+ /* VIA686a test code... reset the latch if count > max */
+ if (count > LATCH-1) {
+ static int last_whine;
+ outb_p(0x34, 0x43);
+ outb_p(LATCH & 0xff, 0x40);
+ outb(LATCH >> 8, 0x40);
+ count = LATCH - 1;
+ if(time_after(jiffies, last_whine))
+ {
+ printk(KERN_WARNING "probable hardware bug: clock
+timer configuration lost - probably a VIA686a motherboard.\n");
+ printk(KERN_WARNING "probable hardware bug: restoring
+chip configuration.\n");
+ last_whine = jiffies + HZ;
+ }
+ }
+
+
spin_unlock(&i8253_lock);
count = ((LATCH-1) - count) * TICK_SIZE;
--end of patch---
This is my first patch, i hope it is ok. i followed the instructions in
Documentation/SubmittingPatches to create it.
- Jonas
PS: please CC me any reply, i haven't registered to the mailinglist.
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