Script to force boot a RK1 equipped with Uboot/Ubuntu 24.04 to eMMC

on-off-pwr.sh

#!/bin/sh

# this is a multicall script:
# call it "on" "offf" or "status".

switch() {
  local mode="$1"
  case "$mode" in
    on | 1 | ON ) mode=on ;;
    off | 0 | OFF ) mode=off ;;
    status | stat | st | "" ) 
      status
      return $?
      ;;
    * )
      echo "E: unknown mode '$mode', ABORT (on, 1, ON, off, 0, off)." >&2
      exit 2
      ;;
  esac
  shift
  for node; do
    case "$node" in
      [1234] )
        ( set -ex
          tpi power -n "$node" "$mode"
        )
        #if [ "$mode" = off ]; then
        #  ( set -ex
        #    tpi advanced -n "$node" normal
        #  )
        #fi
        ;;
      all )
        switch $mode 1 2 3 4
        return $?
        ;;
      * )
        echo "E: unknown node specifier '$node', ABORT (1,2,3,4,all)." >&2
        exit 2
    esac
  done
  status
}

status() {
  tpi power status
}

case "$0" in
  */on | on ) switch on "$@" ;;
  */off | off ) switch off "$@" ;;
  */pwr | pwr ) switch "$@"
esac

RK1-boot-to-eMMC.sh

#!/bin/sh
set -e
set -x

# this needs, coreutils-stty, pppd-chat and minicom installed
# minicom needs proper config files in either /etc/{1..4}.minirc 
# pointing to the correct device

case "${1:-}" in
  [1234] ) NODE="$1" ;;
  * )
    echo "$0 [NODE]" >&2
    exit 1
esac

DEV="/dev/ttyS$NODE"

stty -F $DEV speed 115200

on "$NODE" &

chat -V < $DEV > $DEV \
  "autoboot:" BREAK \
  "=>" 'set boot_targets mmc0' \
  "=>" boot \
  "Enter choice:" 1 \
  # EO chat

echo > $DEV

exec minicom $NODE