mediatek: fix U-Boot env geometry for JioRouter AX6000 JIDU6101

Correct the U-Boot env geometry from "0x80000" "1" to "0x1f000" "5".
The correct LEB size for 128k PEB / 2k page is 0x1f000, and the 0x80000 volume spans 5 LEBs.

This also hardens jiorouter_initial_setup by adding proper error handling
and dynamic UBI device/volume lookups, and generates /etc/fw_env.config to be consistent.

Signed-off-by: Sheikh Faisal <sheikhfaisal713@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/23510
Signed-off-by: Jonas Jelonek <jonas@jonasjelonek.de>

package/boot/uboot-tools/uboot-envtools/files/mediatek_filogic

@@ -150,7 +150,12 @@ gatonetworks,gdsp)
 glinet,gl-mt3000)
 	ubootenv_add_uci_config "/dev/mtd1" "0x0" "0x80000" "0x20000"
 	;;
-jiorouter,ax6000-jidu6101|\
+jiorouter,ax6000-jidu6101)
+	. /lib/upgrade/nand.sh
+	envubi=$(nand_find_ubi ubi)
+	envdev=/dev/$(nand_find_volume "$envubi" u-boot-env)
+	ubootenv_add_uci_config "$envdev" "0x0" "0x80000" "0x1f000" "5"
+	;;
 ltc,vl7m19k)
 	. /lib/upgrade/nand.sh
 	envubi=$(nand_find_ubi ubi)

target/linux/mediatek/filogic/base-files/lib/upgrade/platform.sh

@@ -35,9 +35,20 @@ jiorouter_initial_setup()
 	fi
 
 	ubidetach -m "$mtdnum" 2>/dev/null
-	ubiformat /dev/mtd$mtdnum -y
-	ubiattach -m "$mtdnum"
-	ubimkvol /dev/ubi0 -n 0 -N u-boot-env -s 0x80000
+	ubiformat /dev/mtd$mtdnum -y || exit 1
+	ubiattach -m "$mtdnum" || exit 1
+
+	local ubidev="$(nand_find_ubi ubi)"
+	[ -n "$ubidev" ] || { echo "cannot attach ubi"; exit 1; }
+
+	if ! ubimkvol /dev/$ubidev -n 0 -N u-boot-env -s 0x80000; then
+		echo "failed to create u-boot-env volume - aborting"
+		exit 1
+	fi
+
+	local envdev="$(nand_find_volume "$ubidev" u-boot-env)"
+	[ -n "$envdev" ] || { echo "cannot find u-boot-env volume - aborting"; exit 1; }
+	echo "/dev/$envdev 0x0 0x80000 0x1f000 5" > /etc/fw_env.config
 
 	# Set boot arguments in freshly created U-Boot environment
 	fw_setenv bootcmd 'ubi read 46000000 kernel;fdt addr $(fdtcontroladdr);fdt rm /signature;bootm 0x46000000'