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

[OpenWrt Bugs]

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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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experimented under kernel 5 with the previous sysupgrade code and indeed ended up bricking the Routerstation.
Revived it using Jtag; had copies of the mtd 0-5. Restored mtd0 (uboot) and mtd4 (fis) and mtd5 (uboot data), the latter two I combined into one image.
Interestingly also the Openocd jtag programme provides for erasing flash per sector, and then writing it. But mtd4 and mtd5 together occupy the last sector of the 256 sectors the Routerstation's flash has. So when changing something in one of mtd4 or 5, both need to be rewritten as the flash erase that Openocd offers is not limited to just a part of the sector size.

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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3320#comment8798

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