[LEDE-DEV] ar71xx kernel size starts getting oversized

[Daniel Golle]

Hi Yousong,

the main issue on ar71xx is the high number of mach-*.c files for all
the boards being included in *all* images. Once the target has been
migrated to device tree (which is a huge amount of work, lynxis has
done major progress there), this should easily free 500 kB of the
uncompressed kernel image.

Cheers

Daniel

On Sat, Jun 04, 2016 at 12:49:04PM +0800, Yousong Zhou wrote:
> Several days ago I tried to build a firmware for HiWiFi-HC6361 with
> LEDE master branch.  Yet the firmware was not present in
> bin/targets/ar71xx/generic after the build completed.  I checked the
> downloads.lede-project.org the firmware was also missing there.
> 
> The problem is that mtdparts layout of HC6361 requires the kernel part
> to be not bigger than 1280KB (1310720 bytes).  Yet the lzma-compressed
> kernel uImage has exceeded this size limit.
> 
> The current size of lede-ar71xx-generic-uImage-lzma.bin in
> downloads.lede-project.org is 1367988
> 
> The corresponding file in OpenWrt downloads site are as follows
> 
>     snapshot         1295637
>     15.05.1            1176662
>     14.07               1107048
> 
> My device is currently running 4.1.16 with OpenWrt r48975.  So the
> bloat probably comes from the 4.4 bump.  Sorry that at the moment I
> can just bring the issue up and cannot find time to do further
> investigation.
> 
> Regards
> 
>                 yousong
> 
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