[FS#3320] Ubiquiti Routerstation compilation produces no sysupgrade image anymore

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FS#3320 - Ubiquiti Routerstation compilation produces no sysupgrade image anymore
User who did this - william wortel (wwortel)

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Further experimentation and contact with the patch' author has confirmed that a fix has already been proposed but has not been introduced yet. Experimintally have verified that it works fine. The sysupgrade works on the Routerstation under kernel 5 when pending kernel patch #411
(411-mtd-partial_eraseblock_write.patch) in target/linux/generic/pending-5.4/ is patched using https://patchwork.ozlabs.org/project/openwrt/patch/20200805211354.3922-1-git@johnthomson.fastmail.com.au/
Revert the commits 
https://git.openwrt.org/cc5256a8bfa0
https://git.openwrt.org/0cc87b3bacee
and compile. The produced image has the ability to do sysupgrade on systems with partitions that are smaller than the erase block size of its flash, such as the Ubiquiti Routerstation and RS-Pro. When applying sysupgrade to provide Routerstations with new firmware do verify that the existing firmware does not have a kernel 4 or 5. Sysupgrade then will brick the board and require Jtag to revive it. If in doubt, use tftp and a factory image to upgrade the first time. From then on sysupgrade can be used again using compilations with the fix included. 

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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3320#comment8809

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