[U-Boot] [RFC PATCH v2 00/12] Add support for applications of overlays in SPL

[Michal Simek]

On 27. 03. 19 16:38, Jean-Jacques Hiblot wrote:
> 
> The purpose of this series is to provide the SPL with ability to apply
> overlays for u-boot. this is only a RFC so far, to get a feedback on the
> approach.
> 
> Our use-case is the support of the daughter boards of the AM65x EVM. In
> Linux, each board is supported by a unique overlay. The presence of the
> boards is detected at runtime, and some useful features (like USB) are
> implemented on those daughter boards. Instead of providing multiple dtbs
> and fall in a combinatorial pit, we propose to use DT overlays.
> 
> Patch #1 "spl: fit: Add support for applying DT overlay" has been posted
> a few weeks ago by Michal Simek.
> Patch #2 and #3 amend Michal's patch.
> Patch #4 and #5 are simple fixes for the Makefile
> Patch #6 is not required but relates to this series and will be required
> later by the AM6x platform
> Patch #7 may be a bit controversial. It basically replaces u-boot.img with
> a symlink to u-boot.itb in case we use a "complex" FIT (ie: if
> SPL_FIT_SOURCE or SPL_FIT_GENERATOR are set). This breaks buildman for
> several platforms because not all the binaries embedded in the FIT are
> available.
> Patch #9 adds a way to dynamically select the DT overlays. That is were we
> would use HW detection to select the required overlays. In that case, the
> board-level code tells what overlay it needs (it gives the name of the
> node).
> Patch #10 disables advanced SPL FIT features to keep the size of the SPL of
> the am335x_evm in check
> Patch #11 is not required, but demonstrates on a DRA76-evm how this series
> can be used.
> 
> On arm, if overlay are supported, this series increases the size of the SPL
> by 3-4 kB.
> 
> Changes in v2:
> - reworked board_fit_get_additionnal_images() and how it used in spl_fit.c
> - removed dtbo generation from dtso files and use .dts extension for the
>   overlays
> - add dynamic allocation usage in a separate patch
> - defconfig change for the am335x_evm

This series looks better.
Is this able to also handle different images then just dtbs?

Thanks,
Michal