Follow the strategy of other targets and create a
default environment file, uEnv.txt, to configure the
behavior of U-Boot.
For now, use it to pass bootargs to the kernel

Signed-off-by: Luis Araneda <luaraneda@gmail.com>

Create a directory inside STAGING_DIR and copy U-Boot
output images, so they can be used later when creating the
sdcard image

Additionally, like others targets, override the default
install method to avoid copying the images to bin directory

Signed-off-by: Luis Araneda <luaraneda@gmail.com>

Select the U-Boot variant automatically based on the
current selected device, and hide the package from
menuconfig

Signed-off-by: Luis Araneda <luaraneda@gmail.com>

The board was added when creating the target, but the
corresponding device was never defined inside the target

Signed-off-by: Luis Araneda <luaraneda@gmail.com>

Fixes build with the default profile

Signed-off-by: Felix Fietkau <nbd@nbd.name>

Fixes boot on Hummingboard

Signed-off-by: Felix Fietkau <nbd@nbd.name>

Signed-off-by: Felix Fietkau <nbd@nbd.name>

Will be used by a new combined image for cubox

Signed-off-by: Felix Fietkau <nbd@nbd.name>

- Specifications -

CuBox i1:
- SoC: i.MX6 Solo
- Cores: 1
- Memory Size: 512MB
- GPU: GC880
- Wifi/Bluetooth: Optional
- USB 2.0 ports: 2
- Ethernet: 10/100/1000 Mbps

CuBox i2 | i2eX:
- SoC: i.MX6 Dual Lite
- Cores: 2
- Memory Size: 1GB
- GPU: GC2000
- Wifi/Bluetooth: Optional
- USB 2.0 ports: 2
- Ethernet: 10/100/1000 Mbps

CuBox i4Pro | i4x4:
- SoC: i.MX6 Quad
- Cores: 4
- Memory Size: 2/4 GB
- GPU: GC2000
- Wifi/Bluetooth: Build In
- USB 2.0 ports: 2
- Ethernet: 10/100/1000 Mbps

Built-in u-boot requires SPL (secondary program loader) to be present on the SD-card regardless of the image type which will be loaded.
SPL is generated by the u-boot-mx6cuboxi package which is preselected by the target device and can be found in bin/u-boot-mx6cuboxi directory.

Flashing the SPL:
dd if=/dev/zero of=/dev/mmcblk0 bs=1M count=4
dd if=bin/targets/imx6/generic/u-boot-mx6cuboxi/SPL of=/dev/mmcblk0 bs=1K seek=1

Preparing the firmware on the SD-card:
(echo o; echo n; echo p; echo 1; echo ''; echo ''; echo w) | fdisk /dev/mmcblk0
mkfs.ext4 /dev/mmcblk0p1
mount /dev/mmcblk0p1 /mnt
tar -xzf bin/targets/imx6/generic/openwrt-imx6-device-cubox-i-rootfs.tar.gz -C /mnt/
mkdir -p /mnt/boot
cp bin/targets/imx6/generic/{*-uImage,*.dtb,*.scr} /mnt/boot/

Generated u-boot.img needs to be placed on the first partition:
cp bin/targets/imx6/generic/u-boot-mx6cuboxi/u-boot.img /mnt/

To boot from the SD card:

Boot script which sets mmc/dtb parameters and boots the board is automatically sourced.
If this does not work for any reason:
mmc dev 0; load mmc 0:1 $scriptaddr boot/boot.scr; source $scriptaddr

Currently imx6dl-cubox-i.dtb (Dual Lite) and imx6q-cubox-i.dtb (Quad) device trees are available.

Tested on i4Pro, MMC, USB (+ HiD), HDMI and ethernet ports are working.
Wireless and bluetooth are broken ATM. According to SolidRun forums, BCM4329/BCM4330 firmware is used which works fine on older kernels.

Signed-off-by: Vladimir Vid <vladimir.vid@sartura.hr>

Backport board support from the upcoming v2018.09 release,
and add an additional patch to read the MAC address
from flash memory

Signed-off-by: Luis Araneda <luaraneda@gmail.com>