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>> Is there an easy way to tell, given a root shell on a NetBSD/i386
>> machine, whether the hardware is NetBSD/amd64-compatible (or at
>> least 64-bit compatible - I recognize there may be differences in
>> supported hardware and the like in corner cases)?
> I think you can look in features3 for "EM64T" on an Intel CPU, or
> "LONG" on an AMD.
That's about what I would have expected...except that that one machine
I mentioned that's known to run NetBSD/amd64 shows neither:
cpu0: Intel Core 2 (Merom) (686-class), 1795.58 MHz, id 0x6fd
cpu0: features bfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR>
cpu0: features bfebfbff<PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX>
cpu0: features bfebfbff<FXSR,SSE,SSE2,SS,HTT,TM,SBF>
cpu0: features2 e3bd<SSE3,MONITOR,DS-CPL,VMX,EST,TM2,xTPR>
cpu0: "Intel(R) Core(TM)2 Duo CPU T7100 @ 1.80GHz"
cpu0: I-cache 32 KB 64B/line 8-way, D-cache 32 KB 64B/line 8-way
cpu0: L2 cache 2 MB 64B/line 8-way
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