[riot-notifications] [RIOT-OS/RIOT] boards/frdm-kw41z: add riotboot (#11562)

Francisco notifications at github.com
Tue May 28 15:52:37 CEST 2019


> To put the riotboot features, it may be a good idea to check that the same issue as #11274 is not present.

It is needed for `frdm-k64f` since its sector/page size is 4k, but not for `frdm-kw41z`. There is another pr that implements flashpage for kinetis #11422. But it depends on including `CPU_FAM` before `Makefile.features` so its still delayed. 

Anyway thats not the point. I can add support for `frdm-k64f` in the PR and that way included `RIOTBOOT_LEN` definition for that case.

> I think that somehow all the LINKFLAGS with defsym in cpu/kinetis/Makefile.include can be removed as already defined by cpu/cortexm_common/Makefile.include (_ram_base_addr is unused from a git grep search, did not check history yet)
> It could be the right time to put the _rom_offset/_fw_rom_length calculation in its own file to not duplicate between both kinetis.ld and cortexm.ld.

Ok will need to look into a it a bit!

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