On Mon, Jul 27, 2026 at 02:59:11PM +0800, Eric Chung wrote: > Add document on how to flash images into eMMC of K1 SoC based boards. > > Signed-off-by: Eric Chung <[email protected]> > > --- > v3: > - Add document on how to flash images into SD card. > --- > board/spacemit/k1/MAINTAINERS | 2 +- > doc/board/spacemit/index.rst | 1 + > doc/board/spacemit/k1-mmc.rst | 320 > ++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 322 insertions(+), 1 deletion(-)
... > diff --git a/doc/board/spacemit/k1-mmc.rst b/doc/board/spacemit/k1-mmc.rst > new file mode 100644 > index 00000000000..b0fe78c75ce > --- /dev/null > +++ b/doc/board/spacemit/k1-mmc.rst > @@ -0,0 +1,320 @@ ... > +Chapter 2: SD Card Boot > +======================= > + > + > +SpacemiT K1 Bianbu SD Card Image Flashing and U-Boot Update Guide > +================================================================== > + > +This guide explains how to prepare a bootable SD card with Bianbu OS for > +SpacemiT K1 based boards and how to replace the U-Boot binary on the SD > +card with a custom build. > + > +Prerequisites > +~~~~~~~~~~~~~ > + > +- A SpacemiT K1 based development board > +- A microSD card (at least 8 GB capacity recommended) > +- A card reader for your host computer > +- A Linux host system (for ``dd``, ``fdisk``, ``lsblk`` commands) > +- The Bianbu SD card image from > + > <https://spacemit.com/community/resources-download/Images%20Collects/K1/Bianbu> > +- A custom ``u-boot.itb`` file (device tree blob or U-Boot FIT image) to be > + written to the U-Boot partition > + > +Prepare the SD Card & the image > +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > + > +**1. Download the image** > + > +Download the released package from the official SpacemiT website: > + > +<https://archive.spacemit.com/image/k1/version/bianbu/v2.3.5/Bianbu-Minimal-K1-sdcard-V2.3.5-20260601180942.img.zip> > + > +**2. Extract the image** > + > +.. code-block:: console > + > + $ unzip Bianbu-Minimal-K1-sdcard-V2.3.5-20260601180942.img.zip > + > +**3. Identify the SD card device** > + > +Insert the microSD card into your card reader, then run: > + > +.. code-block:: console > + > + $ lsblk > + > +Compare the output before and after inserting the card to identify > +the new device. It will typically appear as ``/dev/sdb``, ``/dev/sdc``, > +or ``/dev/mmcblk0``. > + > +**4. Write the image to the SD card** > + > +.. code-block:: console > + > + $ sudo dd if=./Bianbu-Minimal-K1-sdcard-V2.3.5-20260601180942.img > of=/dev/sdb bs=1M status=progress > + > +The SD card is now ready as a bootable Bianbu system disk. This looks out of scope of describing how to create a bootable SD card with U-Boot. In my opinion, you'd better describe the requirements of parition layout and image position for SD-card booting, to allow readers to create their own images/bootable medium from scratch more easily, instead of sticking to the vendored image. Best regards, Yao Zi
