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SubjectRe: [PATCH v3] RISC-V: Fix Maximum Physical Memory 2GiB option for 64bit systems
On Fri, Apr 05, 2019 at 05:49:34AM +0000, Anup Patel wrote:
> The Maximum Physical Memory 2GiB option for 64bit systems is currently
> broken because kernel hangs at boot-time when this option is enabled
> and the underlying system has more than 2GiB memory.
>
> This issue can be easily reproduced on SiFive Unleashed board where
> we have 8GiB of memory.
>
> This patch fixes above issue by removing unusable memory region in
> setup_bootmem().
>
> Signed-off-by: Anup Patel <anup.patel@wdc.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>

Btw, what is the rationale behind even offering the 2GiB option and
the medlow model on 64-bit? Do we reall have use cases where the
slightly more effient generated code matters so much to keep up
the support burden of this mostly unused and unusual configuration?

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