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SubjectVIA 686 timer bugfix incomplete
HI!

I noticed with great happiness that the via timer bugfix had made it into linus'
version of the kernel as of 2.4.10.

but it seems that the patch was incomplete: The bug is still triggered on my
computer using 2.4.14, but the bugfix seems to work whith -ac kernels.


now I diffed the ac-version of that file whith the current version of linus'
kernel:

# diff -u arch/i386/kernel/time.c ../linux-2.4.10-ac12/arch/i386/kernel/time.c


--- arch/i386/kernel/time.c Wed Oct 24 17:16:13 2001
+++ ../linux-2.4.10-ac12/arch/i386/kernel/time.c Sun Oct 14 16:23:52 2001
@@ -501,6 +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) {
+ 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;

you can see what's missing to actually work around the via timer bug. I hope
this will go into 2.4.15.

regards

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