Re: [TECH TOPIC] Reaching consensus on CONFIG_HIGHMEM phaseout

Matthew Wilcox
2025-09-12T13:17:02Z

On Fri, Sep 12, 2025 at 02:58:48AM -0700, H. Peter Anvin wrote:
> On September 10, 2025 10:38:15 PM PDT, Andreas Larsson <andreas@gaisler.com> wrote:
> >We have a upcoming SoC with support for up to 16 GiB of DRAM. When that is
> >used in LEON sparc32 configuration (using 36-bit physical addressing), a
> >removed CONFIG_HIGHMEM would be a considerable limitation, even after an
> >introduction of different CONFIG_VMSPLIT_* options for sparc32.
>
> It really sounds like a self-inflicted problem... getting your customers switched over to the RV64 side is probably the best you can do for them.

"We only support configurations above 4GB when using the RV64 core".