On 27/03/2019 10:39, Lukasz Majewski wrote:
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?
For the dra76-evm, the diff in SPL size is 3.3kB
JJ
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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