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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

    PS: CC me in your answers, I am not subscribed to the list
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