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kern/51988: boot fails very early with amd64
>Synopsis: boot fails very early with amd64
>Arrival-Date: Tue Feb 21 01:45:00 +0000 2017
>Originator: Michael van Elst
>Release: NetBSD 7.99.60
System: NetBSD tazz 7.99.60 NetBSD 7.99.60 (TAZZ) #15: Tue Feb 21 01:59:35 CET 2017 mlelstv@gossam:/home/netbsd-current/obj.amd64/home/netbsd-current/src/sys/arch/amd64/compile/TAZZ amd64
Current no longer boots on a Thinkpad T420 with Core-i5 CPU.
After load the kernel, the display shows garbage and the machine resets.
Bisecting the commits of the last two weeks identifies:
Sat Feb 11 16:02:11 UTC 2017 maxv
| src/sys/arch/amd64/conf: Makefile.amd64 kern.ldscript
Put 2MB alignments between the kernel segments. This way the kernel image
is entirely mapped with large pages, which uniformizes performance and
reduces fluctuation. Sent on port-amd64.
as the culprit. Revoking that commit makes the kernel boot and work again.
Boot current on a Thinkpad T520 with
cpu0: "Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz"
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