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BEAGLEBONE 8.0_BETA kernel fails

I finally got around to updating one of my BeagleBone Green systems to

I was dismayed that the 8.0_BETA kernel failed as follows:

NetBSD 8.0_BETA (BEAGLEBONE) #31: Wed Jul 26 21:15:18 CDT 2017
timecounter: Timecounter "clockinterrupt" frequency 100 Hz quality 0
Fatal kernel mode data abort: 'External Non-Linefetch Abort (S)'
trapframe: 0x80a4de70
FSR=00001808, FAR=e0044010, spsr=20000113
r0 =00000000, r1 =e0044000, r2 =00000010, r3 =00000001
r4 =000003e8, r5 =9ff9a1a0, r6 =80310d14, r7 =00000001
r8 =806fe4dc, r9 =9ef40ed8, r10=87ffc01b, r11=80a4dedc
r12=80a4dee0, ssp=80a4dec0, slr=803057cc, pc =80310d14

Stopped in pid 0.1 (system) at  netbsd:generic_bs_w_4:  str     r3, [r1, r2]
db> bt
0x80a4dedc: netbsd:dmt_reset+0x10
0x80a4df04: netbsd:dmt_start_periodic_intr+0x24
0x80a4df2c: netbsd:cpu_initclocks+0x98
0x80a4df94: netbsd:initclocks+0x48
0x80a4dfec: netbsd:main+0x248
0x80a4dffc: netbsd:kernel_text+0x50

It last booted 7.99.42 just fine:

NetBSD 7.99.42 (BEAGLEBONE) #6: Tue Nov  8 05:07:10 CST 2016

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