From a23235a6ed3c1bc3b41481b7e75e33e318bd9bb9 Mon Sep 17 00:00:00 2001
From: Tom F <tom@tom-fitzhenry.me.uk>
Date: Sun, 24 Mar 2019 18:48:11 +1100
Subject: [PATCH] pcengines/apu: expose GRUB over serial

Prior to this commit, an apu's boot would go through stages of varying visibility:
1. BIOS: exposed to serial
2. GRUB: not exposed to serial
3. Linux: exposed to serial

This commit changes (2) to be visible over serial, so the entire boot is visible over serial.

Tested on nixos 18.09 on a https://www.pcengines.ch/apu1d.htm
---
 pcengines/apu/default.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pcengines/apu/default.nix b/pcengines/apu/default.nix
index f59f35a..521887f 100644
--- a/pcengines/apu/default.nix
+++ b/pcengines/apu/default.nix
@@ -1,3 +1,8 @@
 {
   boot.kernelParams = [ "console=ttyS0,115200n8" ];
+  boot.loader.grub.extraConfig = "
+    serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1
+    terminal_input serial
+    terminal_output serial
+  ";
 }