Hi Felix,

Apologies for the late reply.
I went on holidays after sending the patch last week.

I've extensively tested your changes yesterday and they work very nicely.
- Flashing old to new
- Flashing new to new
- Flashing new to old

A big advantage is that no more free space is wasted on the kernel partition.
Especially since this board only has 16MB NOR

[    2.610000] 0x000000060000-0x000000202be8 : "kernel"
[    2.610000] 0x000000202be8-0x000001000000 : "rootfs"

In my humble opinion it's an excellent improvement.
Thanks for your efforts,


On 2016-09-15 22:24, Felix Fietkau wrote:
On 2016-09-15 20:27, Tim Harvey wrote:

I like the 'idea' of using mtdsplit (very clean) however this break's
the ability to downgrade firmware. If I take an old firmware image (a
version of OpenWrt prior to cns3xxx moving to the 4.4 kernel which
became too large to fit in the hard-coded mtd partitions chosen long
ago) I can upgrade with the new mtdsplit sysupgrade however if I then
try to downgrade to a non-mtdsplit sysupgrade image from the older
kernel it will fail in the image check with 'Invalid image type. Image
check 'platform_check_image' failed.'. I suppose if we wanted to
support upgrade and downgrade we would need to keep logic in
platform.sh to deal with the old partitioning.
You can still downgrade, just use lede-cns3xxx-squashfs_laguna_nor.bin
or lede-cns3xxx-squashfs_laguna_spi.bin instead of the -sysupgrade.bin.
The new sysupgrade code will accept it, and even keeping the
configuration should work that way.

This is a bit confusing now, so some documentation will have to be
written. I don't see any easier way though, and simply changing the
partition sizes would also not have worked without breaking stuff.

I suppose sysupgrade != sysdowngrade so maybe I should care about
downgrading without JTAG?

Also, to create JTAG images I need the root.squashfs and the uImage so
we need to keep those in the BIN_DIR (although we don't need to pad
them... I can do that in script that creates JTAG'able images).
The new sysupgrade.bin can be written directly to flash now. You don't
need separate root.squashfs and uImage anymore.

- Felix

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