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 overlayJust 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 -- DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lu...@denx.de
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