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Previously, when memory regions exceed available PMP entries, some regions were silently ignored. If the last entry that covers the full 64-bit address space is not added to a domain, the next stage S-mode software won't have permission to access and fetch instructions from its memory. So return early with error message to catch such situation. Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com> Reviewed-by: Anup Patel <anup@brainfault.org> Link: https://lore.kernel.org/r/20251008084444.3525615-5-peter.lin@sifive.com Signed-off-by: Anup Patel <anup@brainfault.org>