Re: Porter roll call for Debian Bullseye
On Tue, Dec 08, 2020 at 09:53:11PM +0100, Arnd Bergmann wrote:
> I wonder if this is something we should address in the kernel, and make
> the behavior in compat mode resemble native 32-bit kernels more closely.
>
> I think in general we should give as much incentive as possible for
> using 64-bit kernels even when running legacy user space, in
> particular as the 32-bit kernel is also missing some pieces for
> running 32-bit user space on 64-bit hardware.
>
> Right, most importantly, the ones that do not work include
>
> - ThunderX
> - ThunderX2
> - Apple M1
>
> while the ones that do have aarch32 mode include
>
> - All Ampere servers
> - Amazon EC2
> - NXP LX2160, as used in Solidrun LX2K machines
> - All other Cortex-A72 and A76 based servers
But does aarch32 mode imply full support for armv4 instructions?
armhf at armv7 should be fine I would think, but is armel still v4 or did
it move to v5? I can't remember. At least it appears the kernel has
options for emulating things like SWP and SWPB if they are missing.
Perhaps the future for armhf and even armel isn't totally hopeless.
--
Len Sorensen
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