Switched the console output to gpio pins. Cleaned up the @ALL definition. Ignored .img files.

Author: rogerjames99

.gitignore

@@ -15,3 +15,6 @@
 
 # If the VM crashes, it generates a dump, let's ignore it too.
 erl_crash.dump
+
+# Ignore image files
+*.img

mix.exs

@@ -3,7 +3,7 @@ defmodule NervesWebKioskPlayground.MixProject do
 
   @app :nerves_web_kiosk_playground
   @version "0.1.0"
-  @all_targets [:rpi3, :rpi3a, :rpi4, :x86_64, :rpi4_kiosk]
+  @all_targets [:rpi4_kiosk]
 
   def project do
     [

rootfs_overlay/etc/erlinit.config

@@ -0,0 +1,78 @@
+# Additional configuration for erlinit
+#
+# To override the settings in this file, see
+# https://hexdocs.pm/nerves/advanced-configuration.html#overriding-erlinit-config-from-mix-config.
+#
+
+# Turn on the debug prints
+#-v
+
+# Specify where erlinit should send the IEx prompt. Only one may be enabled at
+# a time.
+-c ttyS0     # UART pins on the GPIO connector
+#-c tty1      # HDMI output
+
+# If more than one tty are available, always warn if the user is looking at the
+# wrong one.
+--warn-unused-tty
+
+# Use nbtty to improve terminal handling on serial ports.
+# Comment out or delete for HDMI (tty1)
+-s "/usr/bin/nbtty"
+
+# There's a call to getrandom(2) when loading the crypto NIF that's before
+# nerves_runtime can start rngd. This syscall can block the BEAM indefinitely
+# if there's not enough entropy in the kernel. We have not observed blocking on
+# this platform. However, we don't know that getrandom(2) will always have
+# enough entropy, so start rngd here to be safe.
+--pre-run-exec /usr/sbin/rngd
+
+# Specify the user and group IDs for the Erlang VM
+#--uid 100
+#--gid 200
+
+# Uncomment to ensure that the system clock is set to at least the Nerves
+# System's build date/time. If you enable this, you'll still need to use NTP or
+# another mechanism to set the clock, but it won't be decades off.
+#--update-clock
+
+# Uncomment to hang the board rather than rebooting when Erlang exits
+# NOTE: Do not enable on production boards
+#--hang-on-exit
+
+# Change the graceful shutdown time. If 10 seconds isn't long enough between
+# calling "poweroff", "reboot", or "halt" and :init.stop/0 stopping all OTP
+# applications, enable this option with a new timeout in milliseconds.
+#--graceful-shutdown-timeout 15000
+
+# Optionally run a program if the Erlang VM exits
+#--run-on-exit /bin/sh
+
+# Enable UTF-8 filename handling in Erlang and custom inet configuration
+-e LANG=en_US.UTF-8;LANGUAGE=en;ERL_INETRC=/etc/erl_inetrc;ERL_CRASH_DUMP=/root/crash.dump
+
+# Mount the application partition (run "man fstab" for field names)
+# NOTE: This must match the location in the fwup.conf. If it doesn't the system
+#       will probably still work fine, but you won't get shell history since
+#       shoehorn/nerves_runtime can't mount the application filesystem before
+#       the history is loaded. If this mount fails due to corruption, etc.,
+#       nerves_runtime will auto-format it. Your applications will need to handle
+#       initializing any expected files and folders.
+-m /dev/mmcblk0p1:/boot:vfat:ro,nodev,noexec,nosuid:
+-m /dev/mmcblk0p3:/root:f2fs:nodev:
+-m pstore:/sys/fs/pstore:pstore:nodev,noexec,nosuid:
+-m tmpfs:/sys/fs/cgroup:tmpfs:nodev,noexec,nosuid:mode=755,size=1024k
+-m cpu:/sys/fs/cgroup/cpu:cgroup:nodev,noexec,nosuid:cpu
+
+# Erlang release search path
+-r /srv/erlang
+
+# Assign a hostname of the form "nerves-<serial_number>".
+# See /etc/boardid.config for locating the serial number.
+-d /usr/bin/boardid
+-n nerves-%s
+
+# If using shoehorn (https://github.com/nerves-project/shoehorn), start the
+# shoehorn OTP release up first. If shoehorn isn't around, erlinit fails back
+# to the main OTP release.
+--boot shoehorn