ESP32 PSRAM Cache hardware bug

DFRobot weist beim Firebeetle 2, das ist der mit ESP32-E3, explizit auf den gefixten Hardware-Bug hin:

Espressif has recently released one wafer-level change on the ESP32 Series of products: ESP32-E. Below are the main design changes in the ESP32-E Series of chips:

  1. PSRAM Cache Bug Fix: Fixed “When the CPU accesses the external SRAM in a certain sequence, read & write errors can occur”.
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