Add a weak on_new_pm_mode() hook.
Use Loci pins for buttons.
Use Loci schematic names for the buttons.
Allow more exotic port/pin combos for the buttons.
Set Loci SPI pins.
CC2538: Allow PM0 to be disabled at run-time by calling lpm_set_max_pm(LPM_NONE).
CC2538: Add CONF parameters to select boot loader backdoor pin and logic level.
CC2538: Add FLASH_CONF_ORIGIN and FLASH_CONF_SIZE config parameters.
Complain if there is a UART1 error.
Don't complain unless UARTS_DEBUG = 1.
Make PT semaphores interrupt-safe.
Indicate if the event queue overflows.
Allow NETSTACK_CONF_RADIO to be overridden by the project.