[PATCH] riscv: dts: sophgo: sg2000-milkv-duo-s: reserve memory for RTOS

[Yao Zi]

On Wed, Sep 16, 2026 at 06:06:30PM +0200, Andrei Lalaev wrote:
> The FSBL loads the coprocessor firmware into the last 2 MB of RAM.
> Reserve this region to prevent Linux from using it.

What if the coprocessor changes the load address, e.g., in a new
release, and how could we support other bootloader implementations
with this modification? Wouldn't the part of memory be wasted if no
coprocessor firmware is loaded at all?

It seems to me the best solution is to modify the FSBL to fix up the
devicetree to reserve memory where the coprocessor firmware is loaded
instead.

Anyway, this reserved region isn't defined by the hardware, thus we
shouldn't include it in the upstream Linux devicetree, since it should
describe the hardware.

> Signed-off-by: Andrei Lalaev <andrey.lalaev at gmail.com>

Best regards.
Yao Zi