Messages in this thread | | | Date | Fri, 21 Dec 2001 15:51:48 +0100 | From | Andreas Hartmann <> | Subject | Re: [2.4.17rc1] fatal problem: system time suddenly changes |
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Hello all,
Jeronimo Pellegrini wrote:
> Hi. > > That's a VIA timer bug. The patch that fixes it was inthe kernel some > time ago, but was removed because the workaround was being triggered > when it shouldn't, if I remember correctly. > > Here: > > > --- linux-2.4.15-pre3/arch/i386/kernel/time.c Sun Nov 11 21:33:31 2001 > +++ linux-2.4.15-pre3-new/arch/i386/kernel/time.c Mon Nov 12 14:04:20 2001 > @@ -501,6 +501,19 @@ > > count = inb_p(0x40); /* read the latched count */ > count |= inb(0x40) << 8; > + > + /* > + * When using some via chipsets (as the vt82c686a, for example) > + * the system timer counter (i8253) should be reprogrammed in > + * this case, otherwise it may be reset to a wrong value. > + */ > + if (count > LATCH-1) { > + outb_p(0x34, 0x43); > + outb_p(LATCH & 0xff, 0x40); > + outb(LATCH >> 8, 0x40); > + count = LATCH - 1; > + } > + > spin_unlock(&i8253_lock); > > count = ((LATCH-1) - count) * TICK_SIZE; >
I tested this patch with 2.4.17rc[1|2] - and I couldn't find any problem. The systemtime has always been correct.
Could you please apply this patch to the next kernelversion, maybe spezifically for the VIA - chipset or with some other needed changes as Jeronimo wrote?
Thanks, Andreas Hartmann
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