[OpenWrt-Devel] ipq806x and kernel 4.14 support / 18.06 kernel partition size?

[John Crispin]

On 24/05/18 17:29, Hannu Nyman wrote:
> Increasing the reserved kernel space in master from 2MB to 4MB due to 
> kernel 4.14 for many ipq806x devices like R7800 has broken the 
> sysupgrade possibility from 17.01, 18.06 or an earlier master snapshot 
> build to the current master build. Same goes for the downgrade to 
> stable branches.
>
> The current situation where a jump between master and 18.06 (or 17.01) 
> will always require using the TFTP recovery mode, is rather cumbersome 
> for people who regularly build/maintain both master and stable builds. 
> I have published a community build for R7800 master and stable branch 
> for the last two years, and this will make my life really hard with 
> the new stable 18.06 branch.
>
> That makes me wonder if the kernel space reservation enlargement in 
> the firmware image should be done already for 18.06 although kernel 
> 4.9 does not force that, yet. It should be rather straightforward to 
> enlarge kernel partition size in the 18.06 branch, but not do any 
> other changes (so kernel would stay at 4.9 etc.). That would just 
> decreases the space available for packages by 2 MB (like in master).
>
> That kernel partition size change would enable a smooth jump between 
> master and 18.06, and in future between 18.06 and the next release 
> (18.12?)
>
> The big question is if the sysupgrade break for regular users will be
> * in the 17.01/18.06 change (enabling easy master/18.06/18.xx changes 
> in future), or
> * in the next version bump 18.06/18.xx (causing difficult master/18.06 
> changes in the near future).
>
we need to break at some point regardless. we then need to break again 
when we migrate from swconfig -> DSA. my plan was to also make DSA work 
before the release and then just bite the bullet on this one.

     John

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