[U-Boot] [PATCH PATCH v3 00/12] Add support for applications of overlays in SPL

[Michal Simek]

On 26. 07. 19 21:46, Tom Rini wrote:
> On Thu, May 23, 2019 at 12:39:00PM +0200, 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 to #5 amend Michal's patch.
>> Patch #6 to #8 are simple fixes for the Makefile
>> Patch #9 is not required but relates to this series and will be required
>> later by the AM6x platform
>> Patch #10 is used to reduce the complexity of the Makefile by having FIT
>> generator scripts provide their dependencies
>> Patch #12 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).
>>
>> On arm, if overlay are supported, this series increases the size of the SPL
>> by 3.2 kB.
>>
>> Travis build : https://travis-ci.org/jjhiblot/u-boot/builds/535686392
>> For a strange reason, buildman on travis show errors for sun8i ans sun50i,
>> but pass when I run it locally.
>>
>> Changes in v3:
>> - Add a new config option: SPL_LOAD_FIT_APPLY_OVERLAY. By default, it is
>> not selected.
>> - removed the RFC prefix. This work will be needed soon by TI's AM65x
>> platform. and can probably benefit other modular platforms
>> - removed the last patch that provided an example of how to use this with
>> on a DRA76.
>> - removed the patch that made u-boot.img a symlink to u-boot.itb because
>> it breaks the build of many platforms (because files required to build the
>> ITB are missing)
>> - removed the patch to reduce the footprint of the am335x SPL. (already
>> merged)
>> - Made the boot flow more permissive (don't fail immediately if an overlay
>> is not present) and more verbose when an error occures
>> - handle the dependencies of the FIT generation in a more generic way
>> - use a dedicated kconfig option to enable the application of the overlays
>> by the SPL.
>>
>> 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
>>
>> Jean-Jacques Hiblot (11):
>>   spl: fit: Make room in the FDT before applying overlays
>>   spl: fit: allocate a temporary buffer to load the overlays
>>   spl: fit: Do not fail immediately if an overlay is not available
>>   spl: fit: be more verbose when an error occurs when applying the
>>     overlays
>>   Makefile.lib: include /__symbols__ in dtb if
>>     SPL_LOAD_FIT_APPLY_OVERLAY is enabled
>>   Makefile: Fix tests for CONFIG_SPL_LOAD_FIT and
>>     CONFIG_SPL_FIT_GENERATOR
>>   Makefile: Fix u-boot.itb generation when building outside the source
>>     tree
>>   Makefile: Pass the board name to the FIT generator scripts
>>   Makefile: Query the SPL Fit Generator for its dependencies
>>   spl: fit: constify the output parameter of spl_fit_get_image_name()
>>   spl: fit: Allow the board to tell if more images must be loaded from
>>     FIT
>>
>> Michal Simek (1):
>>   spl: fit: Add support for applying DT overlay
>>
>>  Kconfig                                       | 10 +++
>>  Makefile                                      | 23 +++--
>>  arch/arm/mach-imx/mkimage_fit_atf.sh          | 10 ++-
>>  arch/arm/mach-rockchip/make_fit_atf.py        | 13 ++-
>>  board/sunxi/mksunxi_fit_atf.sh                |  7 ++
>>  .../lion_rk3368/fit_spl_atf.its               |  6 +-
>>  .../puma_rk3399/fit_spl_atf.its               |  8 +-
>>  common/spl/spl_fit.c                          | 90 +++++++++++++++++--
>>  include/spl.h                                 | 16 ++++
>>  scripts/Makefile.lib                          |  4 +
>>  10 files changed, 156 insertions(+), 31 deletions(-)
> 
> So where are we at here?  Simon Glass had a few nits on one patch and
> reviewed the rest.  I don't see any review from Michal and I really
> would like to before applying this as xilinx is another SoC that would
> be making use of this feature, yes?  Thanks folks!

I took July off and trying to catch all emails that's why please give me
some time to take a look at it again. I need to take a look how to
improve that hw detection for applying to overlay.

M