implement keyboard layout selector in bootloader

config/buildroot/board/librem13v4/grub.cfg

@@ -0,0 +1,27 @@
+set default="0"
+set timeout="10"
+
+menuentry "Buildroot (qwerty)" {
+	linux /boot/bzImage root=/dev/sr0 keymap=qwerty/us
+	initrd /boot/initrd
+}
+
+menuentry "Buildroot (dvorak)" {
+	linux /boot/bzImage root=/dev/sr0 keymap=dvorak
+	initrd /boot/initrd
+}
+
+menuentry "Buildroot (colemak)" {
+	linux /boot/bzImage root=/dev/sr0 keymap=colemak/en-latin9
+	initrd /boot/initrd
+}
+
+menuentry "Buildroot (qwertz)" {
+	linux /boot/bzImage root=/dev/sr0 keymap=qwertz/de
+	initrd /boot/initrd
+}
+
+menuentry "Buildroot (azerty)" {
+	linux /boot/bzImage root=/dev/sr0 keymap=azerty/fr
+	initrd /boot/initrd
+}

config/buildroot/board/librem13v4/post-build.sh

@@ -2,5 +2,10 @@
 
 set -u
 set -e
+set -x
 
-echo "post-build.sh was run"
+BOARD_DIR="$(dirname $0)"
+
+cp -f ${BOARD_DIR}/grub.cfg ${TARGET_DIR}/boot/grub/grub.cfg
+
+exit $?

config/buildroot/configs/airgap_librem13v4_defconfig

@@ -1041,7 +1041,7 @@ BR2_PACKAGE_FLASHROM_ARCH_SUPPORTS=y
 # BR2_PACKAGE_IPMIUTIL is not set
 # BR2_PACKAGE_IRDA_UTILS is not set
 # BR2_PACKAGE_IUCODE_TOOL is not set
-# BR2_PACKAGE_KBD is not set
+BR2_PACKAGE_KBD=y
 # BR2_PACKAGE_LCDPROC is not set
 # BR2_PACKAGE_LIBUBOOTENV is not set
 # BR2_PACKAGE_LIBUIO is not set
@@ -3329,7 +3329,7 @@ BR2_TARGET_ROOTFS_CPIO_NONE=y
 # BR2_TARGET_ROOTFS_INITRAMFS is not set
 BR2_TARGET_ROOTFS_ISO9660=y
 BR2_TARGET_ROOTFS_ISO9660_GRUB2=y
-BR2_TARGET_ROOTFS_ISO9660_BOOT_MENU="fs/iso9660/grub.cfg"
+BR2_TARGET_ROOTFS_ISO9660_BOOT_MENU="$(BR2_EXTERNAL_Airgap_PATH)/board/librem13v4/grub.cfg"
 BR2_TARGET_ROOTFS_ISO9660_INITRD=y
 # BR2_TARGET_ROOTFS_JFFS2 is not set
 # BR2_TARGET_ROOTFS_ROMFS is not set

config/buildroot/rootfs_overlay/etc/init.d/S03keymap

@@ -0,0 +1,22 @@
+#!/bin/sh
+
+case "${1}" in
+	start)
+		keymap="$( \
+			awk -F 'keymap=' '{sub(/ .*$/, "", $2); print $2}' /proc/cmdline \
+		)"
+		if [[ ! -z "$keymap" ]]; then
+			printf 'Loading Keymap %s: ' "${keymap}"
+			loadkeys "$keymap"
+			if [ $? -eq 0 ]; then
+				echo "OK"
+			else
+				echo "FAIL"
+			fi
+		fi
+		;;
+	*)
+		echo "Usage: ${0} {start}"
+		exit 1
+		;;
+esac