AWS IoT Greengrass Nucelus for the Raspberry Pi 4

Build the image.

export BUILD_DEVICE=rpi4-32
bitbake aws-biga-image

After building, the images will be in the following directory.

ls tmp/deploy/images/raspberrypi4-64/*sdimg

Where my image happens to be:

FILE=tmp/deploy/images/raspberrypi4-32/core-image-minimal-raspberrypi4-32.rpi-sdimg

Image the target device using dd. You can also use an imaging tool you are comfortable with. BE SUPER CAREFUL

First identify the device using lsblk and then set it to the output variable. This will help you confirm that this is really the target device you want to image. BE SUPER CAREFUL
```
lsblk
#DEVICE=<IDENTIFIED DEVICE, i.e.>
DEVICE=/dev/sda
sudo dd if=$FILE of=$DEVICE bs=1m
```
Modify config.txt

In my case, I use the UART to communicate with the Raspberry Pi. I then remove the remark for the init_uart_baud and init_uart_clock properties.
Eject the SD Card, insert the SD Card to the Raspberry Pi, connect the UART and Ethernet, and power up.

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