uboot-envtools: add support for Gateworks venice

Add uboot-envtools support for Gateworks venice boards based on i.MX8M
SoC's (imx_cortexa53) which boot from and store their U-Boot env on
eMMC boot0 hardware partition.

Signed-off-by: Tim Harvey <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/19347
(cherry picked from commit 29f7c0ef977f03c32ebc5031cc1cda75b6fa2268)
Link: https://github.com/openwrt/openwrt/pull/19437
Signed-off-by: Hauke Mehrtens <[email protected]>

package/boot/uboot-envtools/files/imx_cortexa53

@@ -0,0 +1,21 @@
+[ -e /etc/config/ubootenv ] && exit 0
+
+touch /etc/config/ubootenv
+
+. /lib/uboot-envtools.sh
+. /lib/functions.sh
+
+board=$(board_name)
+
+case "$board" in
+gw,imx8m*|\
+gateworks,imx8m*)
+	# board boots from emmc boot0 hardware partition
+	ubootenv_add_uci_config /dev/mmcblk2boot0 0x3f0000 0x8000
+	ubootenv_add_uci_config /dev/mmcblk2boot0 0x3f8000 0x8000
+esac
+
+config_load ubootenv
+config_foreach ubootenv_add_app_config ubootenv
+
+exit 0