diff options
Diffstat (limited to 'target/linux/mediatek/image/gen_mt7623_emmc_img.sh')
| -rwxr-xr-x | target/linux/mediatek/image/gen_mt7623_emmc_img.sh | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/target/linux/mediatek/image/gen_mt7623_emmc_img.sh b/target/linux/mediatek/image/gen_mt7623_emmc_img.sh index 1cb0883fb0..5b3aa175c8 100755 --- a/target/linux/mediatek/image/gen_mt7623_emmc_img.sh +++ b/target/linux/mediatek/image/gen_mt7623_emmc_img.sh @@ -1,5 +1,8 @@ #!/usr/bin/env bash - +# +# This script is used only to create the "legacy" image for UniElec U7623, +# suitable for upgrading from the vendor OpenWrt or from OpenWrt 19.07. +# OUTPUT_FILE=$1 KERNEL_FILE=$2 RECOVERY_FILE=$3 @@ -7,10 +10,19 @@ ROOTFS_FILE=$4 BS=512 -#These to offsets are relative to the absolute location of the kernel on the mmc -#(0xA00), so their position in the image is -2560 blocks -RECOVERY_OFFSET=67072 -ROOTFS_OFFSET=87552 +# These two offsets are relative to the absolute location of the kernel on the mmc +# (0xA00), so their position in the image is -2560 blocks +# +# They must be kept in sync with the default command line for U7623. +# blkdevparts=mmcblk0:3M@6M(recovery),256M@9M(root)" +# +# For upgrading from the vendor firmware, the total image must fit in its +# MTD 'firmware' partition, which is typically 36MiB. + +# In the legacy image, the uImage starts at block 0xa00. Allow 4864 KiB (9728) blocks. +RECOVERY_OFFSET=9728 +# The recovery image is 3MiB, or 6144 blocks. +ROOTFS_OFFSET=15872 dd bs="$BS" of="$OUTPUT_FILE" if="$KERNEL_FILE" dd bs="$BS" of="$OUTPUT_FILE" if="$RECOVERY_FILE" seek="$RECOVERY_OFFSET" |