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

[Lukasz Majewski]

On Wed, 27 Mar 2019 18:41:08 +0100
Jean-Jacques Hiblot <jjhiblot at ti.com> wrote:

> 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

And the increase in percentage? (What is the dra76-evm size?)

> 
> 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
> >
> > --
> >
> > 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:
> > lukma at denx.de  




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: lukma at denx.de
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