jerpelea edited a comment on issue #413: esp32-core: Fix BOARD_CLOCK_FREQUENCY URL: https://github.com/apache/incubator-nuttx/pull/413#issuecomment-593353012 here is the explanation https://github.com/apache/incubator-nuttx/blob/386bde43cdc0da24c37dbd7b9091eede0b97a35e/boards/xtensa/esp32/esp32-core/include/board.h#L45 By default it is set to 40MHZ and I do not see the reason to hardcode the frequency https://bitbucket.org/alinjerpelea/nuttx/src/ce7a0b390c7c983fbf3811734c8d0a4274b9c3bf/boards/xtensa/esp32/esp32-core/Kconfig#lines-10 I would investigate why CONFIG_ESP32CORE_RUN_IRAM is setting it to 80MhZ https://github.com/apache/incubator-nuttx/pull/413/commits/386bde43cdc0da24c37dbd7b9091eede0b97a35e#diff-f166ac60a5b51d6d6c90be26a4e4145bR76
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