The EFR32_SLWSTK6061A board is very similar to the
EFR32_SLWSTK6000B. The microcontroller uart0, led, and button pins are
exactly the same. Even though the microcontrollers are different they
share the same flash and RAM starting location the same peripheral
memory addresses. So I figured I would try to build the example project
for the 6061A and load it onto the 6000B. But it didn't work.
I followed the device tree source all the way down to zephyr/dts/arm/silabs/efr32fg1p.dtsi
and found that the starting register for the gpio block is listed at
0x4000A400 not 0x4000A000 like it's supposed to be. Here's the excerpt: