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board/zynqmp/kria/readme.txt: improve documentation for qspi programming

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This patch improves the documentation for kria k26 som qspi programming.

Signed-off-by: Neal Frager <neal.frager@amd.com>
Reviewed-by: Luca Ceresoli <luca@lucaceresoli.net>
[Peter: drop trailing spaces]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Neal Frager 2022-05-17 12:38:40 -06:00 committed by Peter Korsgaard
parent 23e1e04d54
commit 0017c3daa8
1 changed files with 22 additions and 6 deletions
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28
board/zynqmp/kria/readme.txt
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@ -56,23 +56,39 @@ Where 'sdX' is the device node of the SD.
Eject the SD card, insert it in the board, and power it up.
How to write the boot.bn to QSPI boot flash
===========================================
How to write boot.bin and u-boot.itb to QSPI boot flash
=======================================================
The Kria SOMs are preconfigured to boot initially from QSPI.
This makes these boards different from other ZynqMP boards
in that the boot.bin needs to be flashed into the QSPI boot
flash such that the U-Boot SPL can then load all of the
remaining images from the SD card.
in that the boot.bin and u-boot.itb files need to be flashed
into the QSPI boot flash such that U-Boot can then load all
of the remaining images from the SD card.
In addition, the KV260 Starter Kit QSPI comes pre-flashed with
a utility designed to make updating the QSPI flash memory
easier.
Instructions for using these utilities to update the boot.bin
Instructions for using these utilities to update the files
in QSPI flash can be found on the wiki link below.
https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/1641152513/Kria+K26+SOM#Boot-Firmware-Updates
Additionally, it is possible to use u-boot for updating the
QSPI with new boot.bin and u-boot.itb images with the u-boot
commands below:
Flashing u-boot.itb:
$ sf probe
$ fatload mmc 1 0x1000000 u-boot.itb
$ sf erase 0xf80000 +$filesize
$ sf write 0x1000000 0xf80000 $filesize
Flashing boot.bin:
$ sf probe
$ fatload mmc 1 0x1000000 boot.bin
$ sf erase 0x200000 +$filesize
$ sf write 0x1000000 0x200000 $filesize
It is possible to boot the Buildroot generated SD card image without
updating the QSPI boot.bin image, so this is an optional step.