On Sun, 15 Dec 2019, Geert Uytterhoeven wrote:
> Hi Brad,
>
> On Sun, Dec 15, 2019 at 3:19 AM Brad Boyer <f...@allandria.com> wrote:
> > We could probably emulate a fake NuBus card in qemu that is just
> > memory in the super slot space for that card. Can a regular driver add
> > RAM, or would we have to detect that in the core code somewhere?
>
> I think a regular driver can do that, if CONFIG_MEMORY_HOTPLUG=y.
> However, the latter depends on CONFIG_SPARSEMEM.
>
> The early core code can just call memblock_add(), though.
>
The nubus subsystem isn't available during early boot. The regular driver
option might be the best option.
BTW, the Nubus memory mapping done in arch/m68k/kernel/head.S (0xf8000000
through 0xffffffff) covers the standard slot space but not the super slot
space.
> Gr{oetje,eeting}s,
>
> Geert
>
>
