*****************
|
Warp i.MX7S board
|
*****************
|
|
This file documents the Buildroot support for the Warp i.MX7S board.
|
|
Build
|
=====
|
|
First, configure Buildroot for the Warp i.MX7S board:
|
|
make warp7_defconfig
|
|
Build all components:
|
|
make
|
|
You will find in output/images/ the following files:
|
- imx7s-warp.dtb
|
- rootfs.ext4
|
- rootfs.tar
|
- sdcard.img
|
- u-boot.imx
|
- zImage
|
|
Flash the eMMC image
|
====================
|
|
In the U-Boot prompt lauch:
|
|
=> ums 0 mmc 0
|
|
This will mount the eMMC content in the host PC as a mass storage device.
|
|
To determine the device associated to the eMMC have a look in the
|
/proc/partitions file:
|
|
cat /proc/partitions
|
|
Buildroot prepares a bootable "sdcard.img" image in the output/images/
|
directory, ready to be dumped into the eMMC. Launch the following
|
command:
|
|
sudo dd if=output/images/sdcard.img of=/dev/<your-emmc-device>
|
|
*** WARNING! This will destroy all the eMMC content. Use it with care! ***
|
|
For details about the medium image layout, see the definition in
|
board/warp7/genimage.cfg.
|
|
How to recover from a bad eMMC image
|
====================================
|
|
In case a bad U-Boot has been flashed to the eMMC and the board no
|
longer boots, it is possible to recover using the imx_usb_loader utility.
|
|
Put the warp7 board in USB download mode by removing the CPU board
|
from the base board then putting switch 2 in the upper position.
|
|
Connect a USB to serial adapter between the host PC and warp7 serial
|
USB port, and also a USB cable between the OTG warp7 port and the host
|
PC.
|
|
Copy u-boot.imx to the imx_usb_loader folder.
|
|
Load u-boot.imx via USB:
|
|
$ sudo ./imx_usb u-boot.imx
|
|
Then U-Boot should start and its messages will appear in the console program.
|
|
Open a terminal program such as minicom.
|
|
Use the default environment variables:
|
|
=> env default -f -a
|
=> saveenv
|
=> ums 0 mmc 0
|
|
sudo dd if=output/images/sdcard.img of=/dev/<your-emmc-device>
|
|
Put warp7 back in eMMC boot mode by placing switch 2 in the lower position
|
and reboot the board.
|
|
Boot the Warp i.MX7S board
|
==========================
|
|
To boot your newly created system:
|
- put a micro USB cable into the Debug USB Port and connect using a terminal
|
emulator at 115200 bps, 8n1;
|
- power on the board.
|
|
Using Wifi
|
==========
|
|
# modprobe brcmfmac
|
# iwconfig wlan0 essid ACCESSPOINTNAME
|
# wpa_passphrase ACCESSPOINTNAME > /etc/wpa.conf
|
(enter the wifi password and press enter)
|
# wpa_supplicant -Dwext -iwlan0 -c /etc/wpa.conf &
|
# udhcpc -i wlan0
|
# ping buildroot.org
|
|
Enjoy!
|
