[U-Boot] [PATCH v5 05/18] arm: MediaTek: add basic support for MT7623 boards

[Weijie Gao]

On Thu, 2018-11-15 at 11:21 -0800, Simon Glass wrote:
> Hi,
> 
> On 14 November 2018 at 18:07, Ryder Lee <ryder.lee at mediatek.com> wrote:
> > From: Weijie Gao <weijie.gao at mediatek.com>
> >
> > This adds a general board file based on MT7623 SoCs from MediaTek.
> >
> > As this u-boot is loaded by MTK proprietary preloader, there is no
> > low level initializtion codes.
> >
> > Signed-off-by: Weijie Gao <weijie.gao at mediatek.com>
> > Signed-off-by: Ryder Lee <ryder.lee at mediatek.com>
> > Tested-by: Matthias Brugger <matthias.bgg at gmail.com>
> > ---
> > Changes since v5: None
> > Changes since v4:
> > -Add gd->bd->bi_boot_params for legacy method - ATAGs.
> > ---
> >  arch/arm/mach-mediatek/Kconfig                | 13 ++++
> >  arch/arm/mach-mediatek/Makefile               |  1 +
> >  arch/arm/mach-mediatek/mt7623/Makefile        |  4 ++
> >  arch/arm/mach-mediatek/mt7623/init.c          | 54 +++++++++++++++
> >  arch/arm/mach-mediatek/mt7623/lowlevel_init.S | 22 ++++++
> >  arch/arm/mach-mediatek/mt7623/preloader.h     | 99 +++++++++++++++++++++++++++
> >  board/mediatek/mt7623/Kconfig                 | 13 ++++
> >  board/mediatek/mt7623/MAINTAINERS             |  7 ++
> >  board/mediatek/mt7623/Makefile                |  3 +
> >  board/mediatek/mt7623/mt7623_rfb.c            | 16 +++++
> >  configs/mt7623n_bpir2_defconfig               | 54 +++++++++++++++
> >  include/configs/mt7623.h                      | 56 +++++++++++++++
> >  12 files changed, 342 insertions(+)
> >  create mode 100644 arch/arm/mach-mediatek/mt7623/Makefile
> >  create mode 100644 arch/arm/mach-mediatek/mt7623/init.c
> >  create mode 100644 arch/arm/mach-mediatek/mt7623/lowlevel_init.S
> >  create mode 100644 arch/arm/mach-mediatek/mt7623/preloader.h
> >  create mode 100644 board/mediatek/mt7623/Kconfig
> >  create mode 100644 board/mediatek/mt7623/MAINTAINERS
> >  create mode 100644 board/mediatek/mt7623/Makefile
> >  create mode 100644 board/mediatek/mt7623/mt7623_rfb.c
> >  create mode 100644 configs/mt7623n_bpir2_defconfig
> >  create mode 100644 include/configs/mt7623.h
> 
> Can this use the bloblist feature which should land soon?
> 
> For now, see dm/spl-working.
> 
> Regards,
> Simon

Hi Simon,

I've read the code for spl handoff. It's a good way though but
unfortunately it cannot be applied to the MT7623 boards.

The reason is that MT7623 uses a MediaTek proprietary preloader which
has the same function as the U-Boot SPL. But the preloader is
close-sourced (by company policy) and only available in binary release.
This means we can't use a real U-Boot SPL to replace the preloader.

At present this chip has already been used in many products. We can't
either release a different preloader which introduces compatibility
issues.

So the conclusion is that we cannot use the bloblist feature for this
SoC.

Best Regards,
Weijie