72 lines
3.4 KiB
Markdown
72 lines
3.4 KiB
Markdown
# Modify Ufiber UF-Instant
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This repo will contains modified RootFS and files used to convert UF-Instant SFP GPON stick from Vendor Lock-in to UFiber production to an open solution
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GPON SFP is based on Realtek RTL9601CI chip. On the market there are ready OOB alternative, all mods are just for fun.
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Please refer to Anime4000 repo for all other information and compatible sticks
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https://github.com/Anime4000/RTL960x/
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GUI on the modded firmware was made by Anime4000 :)
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# Original firmwares from Ubiquiti
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All files were extracted from OLT original firmware. *rootfs* files can be extracted with *unsquashfs* (parts of squashfs-tools)
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# Partition Layout
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Layout of MTD of UF-INSTANT is a little bit different from other Realtek Stick:
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```
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# cat /proc/mtd
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dev: size erasesize name
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mtd0: 00040000 00001000 "boot"
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mtd1: 00002000 00001000 "env"
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mtd2: 00002000 00001000 "env2"
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mtd3: 0003c000 00001000 "config"
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mtd4: 00300000 00001000 "k0"
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mtd5: 004b0000 00001000 "r0"
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mtd6: 00300000 00001000 "k1"
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mtd7: 004b0000 00001000 "r1"
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mtd8: 00010000 00001000 "hw"
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mtd9: 00010000 00001000 "sec"
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mtd10: 00001000 00001000 "Partition_010"
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mtd11: 00001000 00001000 "Partition_011"
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mtd12: 00300000 00001000 "linux"
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mtd13: 004b0000 00001000 "rootfs"
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```
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*mtd0 -> u-Boot*\
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*mtd1/2 -> u-Boot Configuration*\
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*mtd3 -> /var/config mount point where all stick configurations are saved*\
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*mtd4-5 -> kernel0/rootfs0, for the first image. This can be booted setting flags "sw_commit/sw_active" to 0 on u-Boot configuration*\
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*mtd6-7 -> kernel1/rootfs2, for the second image. This can be booted setting flags "sw_commit/sw_active" to 1 on u-Boot configuration*\
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*mtd8 -> used by Europa Driver (laser controller), it contains all information about laser calibration, pay attention because is uniq for each stick!*\
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*mtd9 -> partition used by original UF-INSTANT firmware to write parameters, not used by modified firmware*\
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*mtd10-13 -> overlay partitions*
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# Firmware switching
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It's possible to switch between the two images in two ways:
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1 - changing env `sw_active` and `sw_commit` env from u-Boot prompt (can be done using UART console \
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2 - changing env `sw_active` and `sw_commit` from running Linux using command `nv setenv`
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Env | Value | Boot Bank
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------------| ----- |-------
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`sw_active` & `sw_commit` | `0` | kernel0/root0
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`sw_active` & `sw_commit` | `1` | kernel1/root1
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`nv setenv sw_active 0 && nv setenv sw_commit 0 && reboot` <-- *these commands switch to first image (if booted from second), using 1 doing the reverse*
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# Factory reset after 10 boot
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The stick with original firmware and without any other modification, use an u-Boot env called `bootlimit` that is configured with a value of 10. There is another variable called `bootcount`, this one is increased on each CPU reset. When `bootlimit == bootcount`, u-Boot format partition `mtd3` and tries to download new configuration from tftpboot. With the modified firmware, that is using `mtd3` for configuration, create a little headache.
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To avoid this problem there are two solution:
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1 - reset `bootcount` env on each boot of Linux OS, adding the command `nv setenv bootcount 0` on `rc35` file\
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2 - disable `bootlimit` env setting it to `0`. Can be done with command `nv set bootlimit 0` on Linux OS\
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I prefer first solution, because if you screw up the `mtd3` partition with wrongs values, doing a fast swap for ten times (so avoid full Linux OS boot) will erase config partition an start the stick in factory default
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