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kernel ISI trap on macppc after recent changes

Not long before the kernel version bump to 6.99.10, some changes to
powerpc architectures result in kernel panic during boot on macppc
(at least).  First observed in a 6.99.9 kenrel built sometime on
Saturday, 21 July 2012 (previous kernel built Friday, 20 July worked).
Observed on PowerBook G4 and Rev. A iMac.

From iMac (kernel has DEBUG and DIAGNOSIC enabled):
ohci0 at pci0 dev 20 function 0: Opti 82C861 (rev. 0x10)
csr: 02800016
genppc_pci_intr_map: pin: 1, line: 28
ohci0: interrupting at irq 28
ohci0: OHCI version 1.0, legacy support
usb0 at ohci0: USB revision 1.0
biomask 1f800000 netmask 1f800000 ttymask 1f800000
trap: kernel ISI by 0xc2e37c00 (SRR1 0x40001032), lr: 0x339a14
panic: trap
Stopped in pid 0.1 (system) at  netbsd:cpu_Debugger+0x10:        lwz     
0x0098dbb0: at vpanic+0x21c
0x0098dbe0: at panic+0x4c
0x0098dc20: at trap+0x100
0x0098dcb0: kernel ISI trap by 0xc23e7c00: srr1=0x40001032
            r1=0x98dd80 cr=0x20009032 xer=0 ctr=0xc23e7c00
0x0098dd80: at pic_handle_intr+0x198
0x0098ddc0: at trapstart+0x6b0
0x0098de90: at cpu_initclocks+0x40
0x0098dea0: at initclocks+0x44
0x0098deb0: at main+0x258
0x0098df10: at 0x1000a0

Kernels were built from update build, if it makes a difference.

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