hack: start a tty on boot by running sed on inittab
diff --git a/initramfs-build.sh b/initramfs-build.sh
index 3ea2e08..43e0de8 100755
--- a/initramfs-build.sh
+++ b/initramfs-build.sh
@@ -65,8 +65,22 @@
BR2_TARGET_ROOTFS_CPIO=y
BR2_TARGET_ROOTFS_CPIO_XZ=y
BR2_TARGET_GENERIC_GETTY_PORT="hvc0"
+BR2_ROOTFS_POST_BUILD_SCRIPT="./fix_inittab.sh"
EOF_BUILDROOT
+# Create overlay inittab to start tty on boot
+cat > fix_inittab.sh << EOF_INITTAB
+#!/bin/bash
+# The BR2_TARGET_GENERIC_GETTY=y option doesn't seem to be enabling
+# a terminal on boot in /etc/inittab (as it should).
+#
+# We change the setting rather than writing a new file via overlay
+# that way we get any other changes in the future, including if it
+# starts working again
+sed -i 's|^#ttyS0::.*|hvc0::respawn:/sbin/getty -L hvc0 115200 vt100 # GENERIC_SERIAL|' \\\${TARGET_DIR}/etc/inittab
+EOF_INITTAB
+chmod u+x fix_inittab.sh
+
# Build buildroot
export BR2_DL_DIR=${HOME}/buildroot_downloads
make powerpc64_openpower_defconfig || exit 1