#!/bin/sh

# finish-install.d/80hvcgetty
# Copyright 2019 Karsten Merker <merker@debian.org>
# Licensed under GPLv2

# On riscv64 systems the SBI (system firmware) provides console I/O
# functions ("SBI console") that are made available by the Linux kernel
# as /dev/ttyhvc0.  The physical console device behind the SBI console
# is usually the first serial console in the system (/dev/ttyS0), i.e.
# /dev/ttyhvc0 (indirectly over an SBI function) and /dev/ttyS0 (directly
# over a native Linux serial driver) access the same physical hardware,
# therefore only one of them may be in use at any point in time.
#
# Systemd by default starts a getty on both /dev/ttyS0 and /dev/ttyhvc0
# which causes a problem in this case, so we have to explicitly disable
# the getty on /dev/ttyhvc0 on riscv64 systems.

log() {
	logger -t finish-install "$@"
}

case "$(archdetect)" in
	riscv64/*)
		log "Disabling getty on /dev/ttyhvc0"
		chroot /target ln -sf /dev/null /etc/systemd/system/serial-getty@hvc0.service
		exit 0
		;;
esac