Commit 78e86c89 authored by David Boddie's avatar David Boddie

Add power supply information to the devkit guide

parent 5fa40336
......@@ -13,10 +13,52 @@ consult the :ref:`imx8_devkit_troubleshooting` guide.
.. _`librem5-devkit-tools`:
.. Sections to add: connectng via ssh, connecting HDMI, mouse, keyboard
.. Sections to add:
What's in the box
plugging in via USB-C (power adaptor vs. hub),
connecting via ssh, connecting HDMI, mouse, keyboard
900mA supply
Host mode, hub, no serial out
Device mode, serial
USB 2 to USB 3 hub to USB-C devkit
FTDI cables USB-to-serial
.. contents::
Connecting the Board to a Power Supply
In the default configuration, as shipped, USB in is peripheral mode and a
"wall wart" AC adaptor is used for power.
Alternate Configuration #1 - USB C Console
1. Attach the development board to a USB C or USB 3 port on the host that is
capable of providing 900mA of current.
2. ~30 seconds after boot a new device will appear at ``/dev/ttyACM0`` -- this
is a serial console to the development board.
If your PC cannot provide the necessary power you may need a USB 3 powered hub
between the host and the development board.
Alternate Configuration #2 - USB C Host
In this configuration, USB host mode is used to allow keyboard, mouse and flash
memory sticks to be connected to the development board.
1. On the target, backup the device tree and copy in the USB host version::
cp /boot/dtbs/librem5-evk.dtb /boot/dtbs/librem5-evk.dtb.bak
cp /boot/dtbs/librem5-evk-usbhost.dtb /boot/dtbs/librem5-evk.dtb
2. Attach a USB C hub to the development board.
3. Attach power to the USB C hub.
4. Plug in USB devices and they should appear in the output of the ``dmesg``
and ``lsusb`` tools.
Power on/off
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