Re: earmv4 binaries on RPI3 won't work?

[Jared McNeill <jmcneill%invisible.ca@localhost>]

On Sat, 20 Apr 2019, Jared McNeill wrote:

> On Sat, 20 Apr 2019, Izumi Tsutsui wrote:
>
> > SWP and SWPB instructions have been deperecated on ARMv6 and
> > removed since ARMv7 (because atomic LDREX and STREX insns are added).
>
> FYI some ARMv7 implementations still support it - see SW (bit 10) bit of 
> SCTLR on Cortex-A7. Unfortunately, there is no SW bit on Cortex-A53 so you 
> are out of luck on RPI3.

This looks like a bug (grr ifdefs):

  https://nxr.netbsd.org/xref/src/sys/arch/arm/cortex/a9_mpsubr.S#140

So a Cortex-A7 board running the RPI2 kernel should work. The same board 
running the GENERIC kernel will fail though...