[FS#821] sysupgrade doesn't work on Linksys WRT3200ACM (mvebu)

[LEDE Bugs]

The following task has a new comment added:

FS#821 - sysupgrade doesn't work on Linksys WRT3200ACM (mvebu)
User who did this - Matthias Schiffer (NeoRaider)

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Note that my sysupgrade patchset is not bisectable, either all or none of the patches should be applied for sysupgrade to work. I had intended to keep bisectability, but I didn't notice that the procd master was broken before I pushed my patches, so there was no nice way to achieve that...
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=821#comment2718