igrr commented on issue #413: esp32-core: Fix BOARD_CLOCK_FREQUENCY URL: https://github.com/apache/incubator-nuttx/pull/413#issuecomment-595138207 > The frequency must match a clock source and if on the board is a 26MHZ quarts it it impossible to get 80MHZ. On the ESP32, APB/CPU frequencies higher than the XTAL frequency are obtained using one of the two PLLs. So either of 24 or 40 MHz XTAL can be used as clock source for the PLL. PLL clock (320 or 480 MHz) is then internally divided to produce the CPU clock (80/160/240MHz) and the APB clock (80MHz).
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