[PATCH V7 15/15] iot2050: Add support for configuring M.2 connector

[Simon Glass]

Hi Jan,

On Tue, 28 Feb 2023 at 11:23, Jan Kiszka <jan.kiszka at siemens.com> wrote:
>
> From: Jan Kiszka <jan.kiszka at siemens.com>
>
> The M.2 slots of the related IOT2050 variant need to be configured
> according to the plugged cards. This tries to detect the card using the
> M.2 configuration pins of the B-key slot. If that fails, a U-Boot
> environment variable can be set to configure manually. This variable is
> write-permitted also in secure boot mode as it is not able to undermine
> the integrity of the booted system.
>
> The configuration is then applied to mux the serdes and to fix up the
> device tree passed to or loaded by the bootloader. The fix-ups are
> coming from device tree overlays that are embedded into the firmware
> image and there also integrity protected. The OS remains free to load
> a device tree to which they do not apply: U-Boot will not fail to boot
> in that case.
>
> Based on original patch by Chao Zeng.
>
> Signed-off-by: Jan Kiszka <jan.kiszka at siemens.com>
> ---
>  arch/arm/dts/Makefile                         |   4 +-
>  arch/arm/dts/k3-am65-iot2050-boot-image.dtsi  |  38 ++-
>  ...050-advanced-m2-bkey-ekey-pcie-overlay.dts |  27 ++
>  ...-iot2050-advanced-m2-bkey-usb3-overlay.dts |  47 ++++
>  board/siemens/iot2050/board.c                 | 259 +++++++++++++++++-
>  doc/board/siemens/iot2050.rst                 |  18 ++
>  include/configs/iot2050.h                     |   1 +
>  7 files changed, 391 insertions(+), 3 deletions(-)
>  create mode 100644 arch/arm/dts/k3-am6548-iot2050-advanced-m2-bkey-ekey-pcie-overlay.dts
>  create mode 100644 arch/arm/dts/k3-am6548-iot2050-advanced-m2-bkey-usb3-overlay.dts

There is an 'extension' command and associated infra available. Also
there is sysinfo. I just wanted to check if either of those is helpful
here.

Regards,
Simon