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doc: sl-mx8mm: Add guide for copying the bootloader to SPI NOR 

This adds a guide for copying the raw bootloader image on the SD card
to the SPI NOR using U-Boot itself.

Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
This commit is contained in:
Frieder Schrempf 2023-01-19 12:20:38 +01:00 committed by Heinrich Schuchardt
parent 5800fb8c7a
commit 888ff2eae7
1 changed files with 33 additions and 1 deletions
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34
doc/board/kontron/sl-mx8mm.rst
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@ -92,7 +92,39 @@ Burn the flash.bin to SD card at an offset of 33 KiB:
Boot Boot
^^^^ ^^^^
Put the SD card in the slot on the board and apply power. Put the SD card in the slot on the board and apply power. Check the serial
console for output.
Flash the Bootloader to SPI NOR
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
1. Determine and note the exact size of the ``flash.bin`` image in bytes (e.g.
by running ``ls -l flash.bin``)
2. On the U-Boot CLI copy the bootloader from SD card to RAM:
.. code-block::
mmc dev 1
mmc read $loadaddr 0x42 0x1000
3. Erase the SPI NOR flash:
.. code-block::
sf probe
sf erase 0x0 0x200000
4. Copy the bootloader from RAM to SPI NOR. For the last parameter of the
command, use the size determined in step 1 in **hexadecimal notation**:
.. code-block::
sf write $loadaddr 0x400 0x13B6F0
.. note::
To be able to boot from SPI NOR the OTP fuses need to be set accordingly.
Further Information Further Information
------------------- -------------------