Enforce 32bit kernel

Author: foosel

README.md

@@ -9,6 +9,7 @@ and provides the resulting image ready to flash. Checkout the [releases](https:/
 
 A bunch of simple update scripts are run via [CustoPiZer](https://github.com/OctoPrint/CustoPiZer):
 
+  * `00-enforce-32bit-kernel`: Ensures only 32bit kernels are installed (since RPi kernel 6.1 64bit will be installed even on 32bit)
   * `01-update-octoprint`: Updates OctoPrint to the latest version
   * `02-update-boot`: Updates bootloader and kernel to the latest version
   * `03-update-libcamera-apps`: Updates the the libcamera apps to the latest version

scripts/00-enforce-32bit-kernel

@@ -0,0 +1,17 @@
+set -x
+set -e
+
+export LC_ALL=C
+
+source /common.sh
+install_cleanup_trap
+
+## Taken from https://github.com/piwheels/piwheels/commit/63f2ac1f24ece782627dc47e9519f98222b27490
+
+# Enforce 32-bit kernel as the 64-bit kernel is used by default (also on RPi OS 32-bit) since RPi Linux 6.1
+if [ -f /boot/config.txt ]; then
+    sed -i '/^[[:blank:]]*arm_64bit=/d' /boot/config.txt # remove setting first
+    sed -i '1iarm_64bit=0' /boot/config.txt # readd setting to top of file to assure it is effective on all RPi models
+else
+    echo 'arm_64bit=0' > /boot/config.txt
+fi