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new uBoot commands:
status in[it] setup GPIOs
status ge[t] get button status
status se[t] hh set LEDs to lower 4 bit
status se[t] increment last state, i.e. make LEDs count
status mi[rror] read button status and mirror to LEDs until a key is pressed
status bl[ink] blink LEDs
lcm in[it] initialize subsystem (DSS, GPIOs etc.)
lcm ba[cklight] dd set backlight level (0..255)
lcm po[wer] dd set power level (0..2)
lcm on set lcm on
lcm of[f] set lcm off
gps on | of[f] control GPS receiver (and initialize UART)
gps re[ad] read GPS NMEA from UART until a key is pressed
tsc init initialize/enable TSC2007 through I2C2
tsc get read current ADC values (incl. internal temp and AUX/photosensor)
tsc lo[op] read x/y coordinates
tsc ch[oose] somehow allow to define receptive fields and use the result to select different boot options
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