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Ref: http://esp32.com/viewtopic.php?f=13&t=546&sid=76ff371ae2b259441a2cf355e96d74b9#p2275 This is a really subtle bug, gcc noticed the UART array elements are read-only so implicitly moved the elements to .rodata as if it was const. However this array is accessed from the UART ISR, so has to be in IRAM or DRAM.