Hi Jan, On Tue, 28 Feb 2023 at 11:23, Jan Kiszka <[email protected]> wrote: > > From: Jan Kiszka <[email protected]> > > 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 <[email protected]> > --- > 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
