## Before you start

- The DIP switch SW7 selects the boot source. ON = High, OFF = Low.
- The image boots from the microSD slot SD1. Set SW7 for SD1 boot before power on.
- SW7.2 selects the boot I/O voltage: OFF = 3.3 V, ON = 1.8 V.

## Installation

1. Write the image to a microSD card and insert it into the SD1 slot.
2. Set SW7.1 ON to disable secure boot.
3. Set SW7.3 ON and SW7.4 OFF to select SD/eMMC boot.
4. Set SW7.7 ON to select SD1.
5. Connect a 5 V / 2 A adapter to the power jack CON2.
6. Press the RTC Wakeup button SW1 to turn on the power converters.

## Serial console

- Connect the USB VCOM port CON9 (micro-USB) to the PC. The console is `ttyS0` at 115200 baud.

## Notes

- Switch details: [NuMaker-IoT-MA35D1-A1 user manual](https://www.nuvoton.com/export/resource-files/en-us--UM_NuMaker_IoT_MA35D1_A1_EN_Rev1.12.pdf), section 3.11.

## Rescue

Use this if the board does not boot after a write to eMMC or SPI.

1. Set SW7 for SD1 boot: SW7.1 ON, SW7.3 ON, SW7.4 OFF, SW7.7 ON. The board
   boots the microSD card in slot SD1.
2. Rewrite the internal flash from the running system.
3. Set SW7 back to the device you want to boot.

Switch details: [NuMaker-IoT-MA35D1-A1 user manual](https://www.nuvoton.com/export/resource-files/en-us--UM_NuMaker_IoT_MA35D1_A1_EN_Rev1.12.pdf), section 3.11.