| parameter | Description |
|---|---|
| flash_size_in_MB | new flash chip capacity |
| sysupgrade_OpenWRT | OpenWRT image (firmware) |
| art_file | ART partion from original flash, the last 64k block of the chip no matter what the chip size. |
| boot_loader | bootloader, the first 128kB from original flash |
| Output firmware | sysupgrade_OpenWRT_dump.bin, you can use this to program your new flash chip |
Last active
September 24, 2023 14:09
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2019-02-11-upgrade-flash-chip-tplink-tl-wr840n-4mb-to-8mb
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| set -e | |
| flash_size_in_MB=8 | |
| sysupgrade_OpenWRT="openwrt-18.06.1-ramips-mt76x8-tl-wr840n-v5-squashfs-sysupgrade.bin" | |
| art_file="upload_openwrt_art.bin" | |
| boot_loader="upload_openwrt_mtd0.bin" | |
| sysupgrade_OpenWRT_size=$(wc -c $sysupgrade_OpenWRT | cut -f 1 -d " ") | |
| art_file_size=$(wc -c $art_file | cut -f 1 -d " ") | |
| boot_loader_size=$(wc -c $boot_loader | cut -f 1 -d " ") | |
| echo "sysupgrade_OpenWRT_size: " $sysupgrade_OpenWRT_size | |
| echo "art_file_size: " $art_file_size | |
| echo "boot_loader_size: " $boot_loader_size | |
| padcount=$(($flash_size_in_MB * 1024 * 1024 - $boot_loader_size - $art_file_size - $sysupgrade_OpenWRT_size)) | |
| echo " Write boot loader" | |
| dd if=$boot_loader bs=512 >> "${sysupgrade_OpenWRT}_dump".bin | |
| echo "Write firmware" | |
| dd if=$sysupgrade_OpenWRT bs=512 >> "${sysupgrade_OpenWRT}_dump".bin | |
| echo "Write padding FF" | |
| dd if=/dev/zero ibs=1 count="$padcount" | tr "\000" "\377" >> "${sysupgrade_OpenWRT}_dump".bin | |
| echo "Write art partition" | |
| dd if=$art_file bs=512 >> "${sysupgrade_OpenWRT}_dump".bin |
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| fixed-partitions partitions found on MTD device spi0.0 | |
| Creating 3 MTD partitions on "spi0.0": | |
| 0x000000000000-0x000000020000 : "boot" | |
| 0x000000020000-0x0000003f0000 : "firmware" | |
| 2 tplink-fw partitions found on MTD device firmware | |
| 0x000000020000-0x00000017d048 : "kernel" | |
| 0x00000017d048-0x0000003f0000 : "rootfs" | |
| mtd: device 3 (rootfs) set to be root filesystem | |
| 1 squashfs-split partitions found on MTD device rootfs | |
| 0x0000003b0000-0x0000003f0000 : "rootfs_data" | |
| 0x0000003f0000-0x000000400000 : "factory" | |
| m25p80 spi0.0: s25fl064k (8192 Kbytes) | |
| VFS: Mounted root (squashfs filesystem) readonly on device 31:3. | |
| Freeing unused kernel memory: 208K | |
| This architecture does not have kernel memory protection. | |
| init: Console is alive | |
| init: - watchdog - | |
| random: fast init done | |
| kmodloader: loading kernel modules from /etc/modules-boot.d/* | |
| kmodloader: done loading kernel modules from /etc/modules-boot.d/* | |
| init: - preinit - | |
| rt3050-esw 10110000.esw: link changed 0x00 | |
| random: procd: uninitialized urandom read (4 bytes read) | |
| jffs2: Too few erase blocks (4) --> Your image is probably too big, leaving not enough space for jffs2. | |
| mount_root: failed to mount -t jffs2 /dev/mtdblock4 /tmp/overlay: Invalid argument | |
| mount_root: overlay filesystem has not been fully initialized yet | |
| mount_root: switching to jffs2 overlay | |
| mount_root: switching to jffs2 failed - fallback to ramoverlay | |
| urandom-seed: Seed file not found (/etc/urandom.seed) |
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| root@OpenWrt:~# df -h | |
| Filesystem Size Used Available Use% Mounted on | |
| /dev/root 2.3M 2.3M 0 100% /rom | |
| tmpfs 29.5M 532.0K 29.0M 2% /tmp | |
| tmpfs 29.5M 56.0K 29.5M 0% /tmp/root | |
| overlayfs:/tmp/root 29.5M 56.0K 29.5M 0% / | |
| tmpfs |
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| root@OpenWrt:~# df -h | |
| Filesystem Size Used Available Use% Mounted on | |
| /dev/root 2.3M 2.3M 0 100% /rom | |
| tmpfs 29.5M 540.0K 29.0M 2% /tmp | |
| /dev/mtdblock4 4.1M 304.0K 3.8M 7% /overlay | |
| overlayfs:/overlay 4.1M 304.0K 3.8M 7% / | |
| tmpfs 512.0K 0 512.0K 0% /dev | |
| root@OpenWrt:~# | |
| root@OpenWrt:~# cat /proc/mtd | |
| dev: size erasesize name | |
| mtd0: 00020000 00010000 "boot" | |
| mtd1: 007a0000 00010000 "firmware" | |
| mtd2: 0015d05b 00010000 "kernel" | |
| mtd3: 00642fa4 00010000 "rootfs" | |
| mtd4: 00410000 00010000 "rootfs_data" | |
| mtd5: 00010000 00010000 "config" | |
| mtd6: 00030000 00010000 "factory" |
| Description | Original | Mod |
|---|---|---|
| flash | GigaDevice GD25Q32B (4MB) | Winbond GD25Q64CSIG (8MB) |
| firmware | TL-WR840N(VN)_V5_170517 | openwrt-18.06.1-ramips-mt76x8-tl-wr841n-v13-squashfs-sysupgrade |
| Description | TP-LINK TL-WR841N v13.x | TP-LINK TL-WR840N v5 |
|---|---|---|
| CPU | MediaTek MT7628NN (580MHz) | MediaTek MT7628NN @575MHz |
| RAM | Winbond W9751G6JB-25 (64MB) | ESMT M14D5121632A (64MB) |
| Flash | GigaDevice GD25Q64CSIG (8MB) | GigaDevice GD25Q32B (4MB) |
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