[OpenWrt-Devel] [PATCH 2/3] ath79: fix IMAGE_SIZE for common TP-Link definitions

[mail at adrianschmutzler.de]

> -----Original Message-----
> From: Tom Psyborg [mailto:pozega.tomislav at gmail.com]
> Sent: Mittwoch, 7. August 2019 23:19
> To: Adrian Schmutzler <mail at adrianschmutzler.de>
> Cc: openwrt-devel at lists.openwrt.org
> Subject: Re: [OpenWrt-Devel] [PATCH 2/3] ath79: fix IMAGE_SIZE for
> common TP-Link definitions
> 
> Correct me if I'm wrong but I thought all the data beyond IMAGE_SIZE
> remain intact by OpenWrt on firstboot. Experimenting with Archer C7 v1
> recently I was able to flash OpenWrt image (ar71xx) and after reflashing
> tplink fw previous settings were still valid indicating config partition hasn't
> been overwritten.
> At least TL-MR22U has config partition of 64KB and Archer C7 has 128KB
> - I've gone through GPL sources of Archer and it seems between two
> firmware versions this partition was increased from 64 to 128KB, actually I
> discovered this by hexdiff-ing u-boot versions from each firmware version

Nevertheless, addressing this with IMAGE_SIZE would still be just a hack.

If there is config data to be preserved, one should add a partition for it. Then IMAGE_SIZE would just shrink according to the (then correct) firmware partition. Now that we have DTS files with individual partition schemes, this would be even easier than for ar71xx.

Best

Adrian
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