[FS#1357] ipq806x: sysupgrade not working correctly on AVM FritzBox 4040

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - David Bauer (blocktrron) 

Attached to Project - OpenWrt/LEDE Project
Summary - ipq806x: sysupgrade not working correctly on AVM FritzBox 4040
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Sysupgrade on the FritzBox 4040 is currently not working as expected. 

sysupgrade -n  with the version currently present on the device results in the device updating the system, but not erasing the current config. The Device comes up with its previous config loaded.

Flashing other versions on the device results in sysupgrade sometimes deleting the config, sometimes not. The same goes for a standard sysupgrade  Sometimes the device preserves the configuration, sometimes its erased.

Also the kernel and rootfs partition do not seem to be correctly aligned: 


[    0.778675] 13 ofpart partitions found on MTD device spi0.0
[    0.783585] Creating 13 MTD partitions on "spi0.0":
[    0.788940] 0x000000000000-0x000000040000 : "SBL1"
[    0.794947] 0x000000040000-0x000000060000 : "MIBIB"
[    0.799695] 0x000000060000-0x0000000c0000 : "QSEE"
[    0.804513] 0x0000000c0000-0x0000000d0000 : "CDT"
[    0.809193] 0x0000000d0000-0x0000000e0000 : "DDRPARAMS"
[    0.814056] 0x0000000e0000-0x0000000f0000 : "APPSBLENV"
[    0.819034] 0x0000000f0000-0x0000003cc000 : "urlader"
[    0.824345] 0x00000011dc00-0x000000120000 : "urlader_config"
[    0.829619] 0x000000120000-0x0000001a0000 : "tffs1"
[    0.835307] 0x0000001a0000-0x000000220000 : "tffs2"
[    0.839857] 0x000000220000-0x0000002a0000 : "uboot"
[    0.844766] 0x0000002a0000-0x000001f00000 : "firmware"
[    0.849880] 2 fit-fw partitions found on MTD device firmware
[    0.853813] 0x0000002a0000-0x0000004a0000 : "kernel"
[    0.860651] 0x00000049919c-0x000001f00000 : "rootfs"
[    0.865536] mtd: device 13 (rootfs) set to be root filesystem
[    0.869664] 1 squashfs-split partitions found on MTD device rootfs
[    0.875162] 0x000000750000-0x000001f00000 : "rootfs_data"
[    0.882193] 0x000001f00000-0x000002000000 : "jffs2"


More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1357