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The previous wording "top of PSRAM" was ambiguous: the carve-out is actually mapped at the highest physical addresses of PSRAM (after the rodata, text, and main heap mappings). Update the Kconfig help text for SPIRAM_ENC_EXEMPT and SPIRAM_ENC_EXEMPT_SIZE, the External RAM documentation, and the internal layout comment to say "upper end of PSRAM (highest physical addresses)" instead.