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* Yellow: Always use mini-UART for Bluetooth Unfortunately, the mini-UART device tree adjusts the alias for serial1, which we need to make ttyAMA1 the Zigbee UART (UART4). However, we can no simply adjust that overlay, as the overlays are not built as part of the Buildroot build. Instead, they are directly copied from Raspberry Pi's Firmware repostiory. Instead of using device tree overlays, just apply the changes to our Yellow specific device tree. To avoid that the device tree gets loaded anyhow, we could adjust config.txt but that has complications on its own. Since the overlay might be conflicting with the Yellow device tree anyways, just remove all of them. Note: The miniuart-bt.dtbo overlay won't be present, while config.txt of upgraded instances still reference it. It seems that this doesn't cause problems at boot time. Leaving the dtoverlay=miniuart-bt present also allows user to downgrade in case needed. * Avoid duplicating 98-rpi.conf