Add SBC-specific hint about clearing the SPI bootloader about dietpi-docs HOT 3 OPEN

I also see, the Debian image you used is GPT (?), while ours is MBR.

Yes its GPT.

If one does not want to flash the Raxda Debian image to only erase the SPI flash, connecting PIN 23 and 25 disables the SPI flash: MichaIng/DietPi#3292 (comment)

Then one can run this script from DietPi, to erase the SPI bootloader which allows to remove the PIN 23-25 wire again.

I recommend to use this guide: https://wiki.radxa.com/Rockpi4/dev/spi-install
at the very bottom

@twerpyfie
Could you paste the content of the rockpi4b_erase_spi_flash.sh script?
rkdeveloptool is required then as well, but maybe we can put everything together so one can use this to erase the SPI image from any currently booted system.

@MichaIng
Sure, but you don't need the rkdeveloptool for that as far as I know.

#!/bin/bash

set -eo pipefail

if [[ "$(id -u)" -ne "0" ]]; then
    echo "This script requires root."
    exit 1
fi

if ! which flash_erase &>/dev/null; then
    echo "Install mtd-utils with 'apt-get install mtd-utils'"
    exit 1
fi

echo "Doing this will overwrite data stored on SPI Flash"
echo "  and it will require that you use eMMC or SD"
echo "  as your boot device."
echo ""

while true; do
    echo "Type YES to continue or Ctrl-C to abort."
    read CONFIRM
    if [[ "$CONFIRM" == "YES" ]]; then
        break
    fi
done

if ! MTD=$(grep \"loader\" /proc/mtd | cut -d: -f1); then
    echo "loader partition on MTD is not found"
    return 1
fi

flash_erase "/dev/$MTD" 0 0

echo Done.

from dietpi-docs.

For reference: MichaIng/DietPi#3292

Most likely the SPI bootloader expects certain root/boot partition UUIDs or a certain partitioning in general (while the currently DietPi image, as based on ARMbian, comes with a single partition only), which does not match the DietPi SDcard image. I also see, the Debian image you used is GPT (?), while ours is MBR.

If one does not want to flash the Raxda Debian image to only erase the SPI flash, connecting PIN 23 and 25 disables the SPI flash: MichaIng/DietPi#3292 (comment)

Then one can run this script from DietPi, to erase the SPI bootloader which allows to remove the PIN 23-25 wire again.
@twerpyfie
Could you paste the content of the rockpi4b_erase_spi_flash.sh script?
rkdeveloptool is required then as well, but maybe we can put everything together so one can use this to erase the SPI image from any currently booted system.

from dietpi-docs.

@twerpyfie
Many thanks.

It's mtd-utils which provides the flash_erase command to clear SPI flash.

from dietpi-docs.