[U-Boot] [RFC PATCH v1 0/9] Add support for applications of overlays in SPL

[Lukasz Majewski]

Hi Jean-Jacques,

> 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.
> 
> The first 4 patches are small fixes/improvement related to the build.
> Patch #5 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)
> 
> Patch #6 and #7 are the core support for DTB application in the SPL.
> Based on a patch posted by Michal Simek a few weeks ago. The list of
> overlays is read from the "fdt" of the configuration chosen in the
> ITB (same property as for the DTB):
>   configurations {
>      default = "conf-1";
>      conf-1 {
>        description = "dra76-evm";
>        firmware = "firmware-1";
>        fdt = "fdt-1", "overlay-1";
>       };
>   }
> 
> 
> Patch #8 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 #9 is not required, but demonstrates on a DRA76-evm how this
> series can be used.
> 
> 
> Jean-Jacques Hiblot (8):
>   dtbo: also generate dtbo from dtso
>   Makefile.lib: include /__symbols__ in dtb if OF_LIBFDT_OVERLAY is
>     enabled
>   Makefile: Fix u-boot.itb generation when building outside the source
>     tree
>   Makefile: Pass the board name to the FIT generator scripts
>   Makefile: use custom ITS to build u-boot.img if SPL_FIT_SOURCE or
>     SPL_FIT_GENERATOR are set
>   spl: fit: Allow calling spl_load_fit_image() to only get the image
>     size
>   sp: fit: Allow the board to dynamically select the DTB overlays it
>     needs.
>   !!! TEMP !!! For demonstration only !!! DRA76: Usage of overlays in
>     SPL
> 
> Michal Simek (1):
>   spl: fit: Add support for applying DT overlay

Just out of curiosity - what is the difference in SPL footprint when
with and without this feature?

> 
>  Makefile                                      |  20 ++-
>  arch/arm/dts/Makefile                         |   2 +-
>  arch/arm/dts/dra76-evm-dummy.dtso             |  14 +++
>  arch/arm/dts/dra76-evm-dummy2.dtso            |  15 +++
>  arch/arm/mach-imx/mkimage_fit_atf.sh          |   3 +-
>  arch/arm/mach-rockchip/make_fit_atf.py        |   5 +-
>  .../lion_rk3368/fit_spl_atf.its               |   6 +-
>  .../puma_rk3399/fit_spl_atf.its               |   8 +-
>  board/ti/dra7xx/evm.c                         |  30 +++++
>  board/ti/dra7xx/evm.its                       |  48 ++++++++
>  common/spl/spl_fit.c                          | 114
> +++++++++++++++++- configs/dra7xx_evm_defconfig                  |
> 2 + include/spl.h                                 |  20 +++
>  scripts/Makefile.lib                          |   7 ++
>  14 files changed, 273 insertions(+), 21 deletions(-)
>  create mode 100644 arch/arm/dts/dra76-evm-dummy.dtso
>  create mode 100644 arch/arm/dts/dra76-evm-dummy2.dtso
>  create mode 100644 board/ti/dra7xx/evm.its
> 




Best regards,

Lukasz Majewski

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