Probably because most routers so far don't have enough flash memory to hold two partitions. I have seen this used on some Professional NAS systems.
Pretty useful though !

The information I have from Belkin about this feature how it works is: If the new flashed partition has some problem (e.g: Kernel Panic) U-Boot will try 3 times and if it still fails it will automatically revert back to boot from the previous working partition.

Regards,
Fernando

On 09/05/2014 12:16, Karl Palsson wrote:
Are there any existing docs on sysupgrade dual boot support like this?  It's a 
nice feature,
and I'd love to use existing functionality for this, but I haven't seen it, or 
heard about it
before.

Cheers,
Karl P

On Fri, May 09, 2014 at 11:48:23AM +0200, John Crispin wrote:
nack,

wrong folder duplicates functionality ......

        John

On 08/05/2014 23:07, Matthew Fatheree wrote:
 From dea780ba779104cd1460efe3815c16990f5db959 Mon Sep 17 00:00:00
2001 From: Matthew Fatheree <matthew.fathe...@belkin.com> Date:
Sun, 4 May 2014 19:10:18 +0700 Subject: [PATCH 16/30] mamba mvebu:
sysupgrade support for mamba + dual boot is supportted

Add platform specific support for sysupgrade. Mamba supports dual
boot implementation. The firmware can be flashed to Primary Boot
partition or Alternative Boot partition. The sysupgrade has the
ping-pong effect:
.....
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