I don't really like the fact that it has to be turned on manually. Is it
possible to make this automatic based on BIOS Id or something like this?

-Maxim

Rui Paulo wrote:
> I'm requesting review for the following patch:
>
> Index: sys/i386/isa/clock.c
> ================================================== =================
> RCS file: /home/ncvs/src/sys/i386/isa/clock.c,v
> retrieving revision 1.240
> diff -u -p -r1.240 clock.c
> --- sys/i386/isa/clock.c 26 Oct 2007 03:23:54 -0000 1.240
> +++ sys/i386/isa/clock.c 7 Nov 2007 15:27:21 -0000
> @@ -130,6 +130,9 @@ static u_char rtc_statusb = RTCSB_24HR;
> #define ACQUIRED 2
> #define ACQUIRE_PENDING 3
>
> +/* Intel ICH register */
> +#define ICH_PMBASE 0x400
> +
> static u_char timer2_state;
>
> static unsigned i8254_get_timecount(struct timecounter *tc);
> @@ -616,11 +619,26 @@ i8254_init(void)
> void
> startrtclock()
> {
> + char *ichenv;
> u_int delta, freq;
>
> writertc(RTC_STATUSA, rtc_statusa);
> writertc(RTC_STATUSB, RTCSB_24HR);
>
> + /*
> + * On some systems, namely MacBooks, we need to disallow the
> + * legacy USB circuit to generate an SMI# because this can
> + * cause several problems, namely: incorrect CPU frequency
> + * detection and failure to start the APs.
> + */
> + ichenv = getenv("hw.ich.disable_legacy_usb");
> + if (ichenv != NULL) {
> + if (bootverbose)
> + printf("Disabling LEGACY_USB_EN bit on Intel ICH.\n");
> + outl(ICH_PMBASE + 0x30, inl(ICH_PMBASE + 0x30) & ~0x8);
> + freeenv(ichsmi);
> + }
> +
> freq = calibrate_clocks();
> #ifdef CLK_CALIBRATION_LOOP
> if (bootverbose) {
>
>
> If you have a MacBook, you now need to set hw.ich.disable_legacy_usb on
> the boot loader prompt or in loader.conf. I decided to go this route
> because it seems safer. Imagine the case where there's a port at the
> same IO address that has nothing to do with the ICH7. If we tried to
> issue the outl() on every system, something bad could happen.
>
> Comments?
>
> Regards.
> --
> Rui Paulo
>
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