libre: u-boot: Add uboot4extlinux-imx

The instructions to flash are based on information from uboot's
doc/imx/mkimage/imximage.txt document.

As for the USB Armory which uses an I.MX 53, the it also uses the
same offset as documented in an u-boot installation guide:
https://github.com/inversepath/usbarmory/wiki/Secure-boot-(Mk-I)#user-content-prepare-and-flash-the-signed-u-boot

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/libre/uboot4extlinux-imx/uboot4extlinux-imx.install b/libre/uboot4extlinux-imx/uboot4extlinux-imx.install
new file mode 100644
index 000000000..b2860fca2
--- /dev/null
+++ b/libre/uboot4extlinux-imx/uboot4extlinux-imx.install
@@ -0,0 +1,35 @@
+flash_instructions() {
+  echo "# dd if=/boot/u-boot/images/u-boot.imx of=/dev/mmcblk0 bs=512 seek=2"
+}
+
+extlinux_warning() {
+  echo "==> WARNING: Remember to set up your kernels in /boot/extlinux/extlinux.conf"
+}
+
+flash_uboot() {
+  root=$(mount | awk '/ on \/ / { print $1; }')
+  if [[ $root =~ ^/dev/mmcblk.*$ ]]; then
+    root=${root:0:12}
+    echo "A new U-Boot version needs to be flashed onto $root."
+    echo "Do you want to do this now? [y|N]"
+    read -r shouldwe
+    if [[ $shouldwe =~ ^([yY][eE][sS]|[yY])$ ]]; then
+      dd if=/boot/u-boot/images/u-boot.imx of=$root bs=512 seek=2
+    else
+      echo "You can do this later by running:"
+      flash_instructions
+    fi
+  else
+    echo "Flash the new U-Boot version onto your boot device. For example:"
+    flash_instructions
+  fi
+  extlinux_warning
+}
+
+post_install() {
+  flash_uboot
+}
+
+post_upgrade() {
+  flash_uboot
+}
\ No newline at end of file