NOTE regarding JTAG on Philips LPC

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If JTAG is enabled on the chip, then all of pins P0.22 thru P0.31 are disabled, and taken over by ETM which you can't disable.

Various PINSEL settings for non-gpio functions:

Uart0: PINSEL0 0x00000005 i2c: 0x00000050 spi: 0x00005500