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927f12415e
nrf52840dk: 16 MHz TRACECLK (hardware cap) width 4, P25 soldered, SW7=Alt; no family code needed (J-Link arms TRACECONFIG). nrf5340dk: TRACE_ETM builds force the TAD port to 16 MHz (SystemInit's 64 MHz is marginal), +3 ns sample timing; the interface MCU's UART1 flow control drives the trace pins - SB27/SB28 must be cut (P0.10/P0.11 = TRACEDATA1/0).