[FS#380] sysupgrade corrupts firmware on ASUS RT-N16

[LEDE Bugs]

The following task has a new comment added:

FS#380 - sysupgrade corrupts firmware on ASUS RT-N16
User who did this - Mathias Kresin (mkresin)

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> can sysupgrade be asked to start some kind of failsafe mode (presumably from tmpfs) after it finishes instead of rebooting?

During sysupgrade the system is already switched to a ramfs. Have a look at the file package/base-files/files/lib/upgrade/common.sh. There you find a lot of teh stuff that is done during sysupgrade. As far as I can see, it is enough to remove the reboot.

> I don’t know of any method to boot initramfs from somewhere on this device; is there one?

No idea, sorry.

> it suffice to boot to failsafe mode (so that nothing is mounted rw) and dump from there? 

Could work. I'm not sure if the mtd splitter touches the mtd before failsafe (to create the rootfs_data partition).
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=380#comment1252