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The ROM code _data_ section is loaded into the middle of the DRAM address space, unlike the other chips where it is loaded at the end. Therefore subtracting the previously "reserved" section from heap end could actually corrupt the ROM data section. For the ESP32, the DRAM block has been split into two individual segments, with some reserved segments in the middle (addresses taken from esp-idf). At the moment we don't use the second segment at all in esp-hal, but we could utilize it in esp-wifi for placing the internal allocator for example.