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The R40 is marketed as the successor to the A20. The SRAM layout is the
same as the A20, but there doesn't seem to be a secure SRAM block.

The SID block is at a completely different address. The layout is the
same as the newer SoCs, with the e-fuses at an offset of 0x200.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>