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Warp i.MX7S board
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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
- emmc.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 "emmc.img" image in the output/images/
directory, ready to be dumped into the eMMC. Launch the following
command:
sudo dd if=output/images/emmc.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/emmc.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.
Enjoy!
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