Date: Tue, 17 Nov 1998 11:39:23 -0600 (CST) From: Kevin Day <toasty@home.dragondata.com> To: sanpei@sanpei.org (MIHIRA Yoshiro) Cc: current@FreeBSD.ORG, sanpei@sanpei.org, cjohnson@netgsi.com Subject: Re: MediaGX and calcru: negative time Message-ID: <199811171739.LAA28243@home.dragondata.com> In-Reply-To: <199811171122.UAA01911@lavender.sanpei.org> from MIHIRA Yoshiro at "Nov 17, 98 08:22:10 pm"
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I can confirm that this patch works:
Copyright (c) 1992-1998 FreeBSD Inc.
Copyright (c) 1982, 1986, 1989, 1991, 1993
The Regents of the University of California. All rights reserved.
FreeBSD 3.0-RELEASE #3: Tue Nov 24 17:38:30 CST 1998
devel@kevin1.touchmaster:/usr/src/sys/compile/DEVEL
Calibrating clock(s) ... TSC clock: 233902340 Hz, i8254 clock: 1217245 Hz
1217245 Hz differs from default of 1193182 Hz by more than 1%
Timecounter "i8254" frequency 1193182 Hz cost 1302 ns
Timecounter "TSC" frequency 233864996 Hz cost 180 ns
CPU: Cyrix GXm (233.86-MHz 586-class CPU)
Origin = "CyrixInstead" Id = 0x540 Stepping=0 DIR=0x3346
Features=0x808131<FPU,TSC,MSR,CX8,CMOV,MMX>
I'm going to file a errata report with Cyrix....
Kevin
>
> I have MediaGX box. I install 2.2.6R. I also have this problem.....
> But my problem is only calcru, and can't detect psm0(PS/2) port.
> Sometimes can't detect Ethernet Card(occasionally automatically rebooted...).
>
> This problem (I think) already reported to GNATS Problem repository,
> kern/6630[1] which is included experimental patch. Please apply this patch.
> This Patch is ``check timer twice, and use larger one at getit:clock.c''.
>
> Another person who has also MediaGX box, reported me that
> his MediaGX box is needed 4 times to detect correct one.
>
> I had planning to report this problem to GNATS Database and Mr Christopher
> T. Johnson.
>
> [1] kern/6630: Fix for Cyrix I8254 bug
> http://www.freebsd.org/cgi/query-pr.cgi?pr=6630
>
> Thank you
> MIHIRA Yoshiro
>
> -----
> 4times patch
> --- /sys/i386/isa/clock.c Sun Apr 27 22:44:19 1997
> +++ ./clock.c Mon Nov 2 17:01:55 1998
> @@ -345,7 +345,9 @@
> {
> u_long ef;
> int high, low;
> -
> +#ifdef CPU_CYRIX_NO_I8254_LATCH
> + int ret1, ret2, ret3, ret4;
> +#endif
> ef = read_eflags();
> disable_intr();
>
> @@ -354,9 +356,32 @@
>
> low = inb(TIMER_CNTR0);
> high = inb(TIMER_CNTR0);
> +#ifdef CPU_CYRIX_NO_I8254_LATCH
> + ret1 = (high << 8) | low;
>
> + outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH);
> + low = inb(TIMER_CNTR0);
> + high= inb(TIMER_CNTR0);
> + ret2 = (high << 8) | low;
> +
> + outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH);
> + low = inb(TIMER_CNTR0);
> + high= inb(TIMER_CNTR0);
> + ret3 = (high << 8) | low;
> +
> + outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH);
> + low = inb(TIMER_CNTR0);
> + high= inb(TIMER_CNTR0);
> + ret4 = (high << 8) | low;
> +#endif
> write_eflags(ef);
> +#ifdef CPU_CYRIX_NO_I8254_LATCH
> + ret1 = (ret1 > ret2 ? ret1 : ret2);
> + ret3 = (ret3 > ret4 ? ret3 : ret4);
> + return (ret1 > ret3 ? ret1 : ret3);
> +#else
> return ((high << 8) | low);
> +#endif
> }
>
> /*
>
>
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