[Buildroot] [PATCH v4 1/3] board/zynqmp/kria/readme.txt: improve documentation for qspi programming

[Neal Frager]

Hi,

> This patch improves the documentation for kria k26 som qspi programming.
> 
> Signed-off-by: Neal Frager <neal.frager at amd.com>
> ---
> V1->V2:
> V2->V3:
>    - fixes boot.bin file name spelling error
> V3->V4:
>    - improved documentation to use $filesize
> ---
>   board/zynqmp/kria/readme.txt | 28 ++++++++++++++++++++++------
>   1 file changed, 22 insertions(+), 6 deletions(-)
> 
> diff --git a/board/zynqmp/kria/readme.txt 
> b/board/zynqmp/kria/readme.txt index a3a4b5e65a..977e88491c 100644
> --- a/board/zynqmp/kria/readme.txt
> +++ b/board/zynqmp/kria/readme.txt
> @@ -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 the 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.
> --
> 2.17.1
> 

> Acked-by: Michal Simek <michal.simek at amd.com>

Just a friendly reminder regarding this patch set.  Any additional changes needed before committing?

Best regards,
Neal Frager
AMD