[FS#3750] [21.02.0-rc1] ath79 uap-pro bricked from ar71xx sysupgrade or factory tftprecovery

[OpenWrt Bugs]

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FS#3750 - [21.02.0-rc1] ath79 uap-pro bricked from ar71xx sysupgrade or factory tftprecovery 
User who did this - Walter Sonius (walterav1984)

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This commit introduced the ath79 support:
https://github.com/openwrt/openwrt/commit/b7da0d294465d5ab8d923f3b8265ece0a5847ac3#diff-eb701754294458d67afa7f1600b78474b9314ea90b581346152acbe1a1deb369

Since direct ar71xx to ath79 crossflash is not supported, it should be supported by tftp-recovery according to the at79 support commit. Which in this case is still broken.

The 'dts' file shows 5 compatible= "fixed-partitions" and 2 sub partitions inside the "firmware" partition with also the compatible= "fixed-partitions":
https://github.com/openwrt/openwrt/blob/master/target/linux/ath79/dts/ar9344_ubnt_unifi-ap-pro.dts

It is mentioned as a comment @line85 that the kernel size may increase, but does that mean you have to adjust/code the kernel/rootfs accordingly to match addresses manually since its listed compatible= "fixed-partitions"? Just doing some guesses here...


					/* Can be resized w/o issues.
					 * U-Boot can load kernel from the
					 * entirety of the "firmware" partition space.
					 */


Overtime the kernel increased in size from 19.07.7 to 21.02.0-rc1:


## Booting image at 81000000 ...
   Image Name:   MIPS OpenWrt Linux-4.14.221
   Created:      2021-02-15  15:22:37 UTC
   Image Type:   MIPS Linux Kernel Image (lzma compressed)
   Data Size:    1589545 Bytes =  1.5 MB
   Load Address: 80060000
   Entry Point:  80060000

## Booting image at 81000000 ...
   Image Name:   MIPS OpenWrt Linux-5.4.111
   Created:      2021-04-18  10:06:57 UTC
   Image Type:   MIPS Linux Kernel Image (lzma compressed)
   Data Size:    2033665 Bytes =  1.9 MB
   Load Address: 80060000
   Entry Point:  80060000

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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3750#comment9568

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