Any recent changes to amd64 timecounters?

[Paul Goyette <paul%whooppee.com@localhost>]

I've got an older amd64 machine running on an ASUS M4A88T-M motherboard 
and it works just fine with NetBSD 6.99.17 (current from 2013-02-22).

But when I tried to upgrade to today's 6.99.23, the boot process hangs 
right after

        ...
        amdnb_misc0 at pci0 dev 24 function 3: AMD NB Misc Configuration
        pchb4 at pci0 dev 24 function 4: vendor 0x1022 product 0x1204 (rev. 
0x00)
        isa0 at pcib0
        pckbc0 at isa0 port 0x60-0x64
        pckbd0 at pckbc0 (kbd slot)
        pckbc0: using irq 1 for kbd slot
        wskbd0 at pckbd0: console keyboard, using wsdisplay0

When booting the 6.99.17 kernel, the next few lines are

        timecounter: Timecounter "clockinterrupt" frequency 100 Hz quality 0
        timecounter: Timecounter "TSC" frequency 3214618050 Hz quality 3000
        uhub0 at usb2: vendor 0x1002 EHCI root hub, class 9/0, rev 2.00/1.00, 
addr 1
        uhub0: 6 ports with 6 removable, self powered

followed by the rest of USB configuration.

I tried to disable pckbc* during the boot, but it still hangs, between 
the lines for isa0 and timecounters.

This motherboard has a AMD 710 southbridge.  Three other machines with 
the same CPU and Northbridge (880G) chips, but with AMD 850 SB, boot the 
new kernel just fine.

So, has something in this area changed recently?


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