Add leed beep boop at start

README.md

@@ -32,6 +32,10 @@ booting, no need burn u-boot to it.
 The required modules (and maybe a bit more) are present in stage-1 so the
 display should start early enough in the boot process.
 
+The LED should start up "amber, red, amber, green, amber" with this u-boot
+configuration, as a way to show activity early. The kernel should set it to
+green as soon as it can.
+
 ## Note about cross-compilation
 
 This will automatically detect the need for cross-compiling or not.

u-boot/0001-HACK-Add-changing-LEDs-signal-at-boot-on-pinebook-pr.patch

@@ -0,0 +1,25 @@
+From a737fd023f4f98d7789e9aafbe938acb78e4c191 Mon Sep 17 00:00:00 2001
+From: Samuel Dionne-Riel <samuel@dionne-riel.com>
+Date: Mon, 6 Jan 2020 20:16:27 -0500
+Subject: [PATCH] HACK: Add changing LEDs signal at boot on pinebook pro
+
+---
+ include/configs/pinebook_pro_rk3399.h | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/include/configs/pinebook_pro_rk3399.h b/include/configs/pinebook_pro_rk3399.h
+index f383becbf8..749713c025 100644
+--- a/include/configs/pinebook_pro_rk3399.h
++++ b/include/configs/pinebook_pro_rk3399.h
+@@ -9,6 +9,8 @@
+ #define __PINEBOOKPRO_RK3399_H
+ 
+ #define ROCKCHIP_DEVICE_SETTINGS \
++		"beep_boop=led work on; led standby on; sleep 0.1; led work off; sleep 0.1; led work on; sleep 0.1; led standby off; sleep 0.1; led standby on\0" \
++		"bootcmd=run beep_boop; run distro_bootcmd\0" \
+ 		"stdin=serial,usbkbd\0" \
+ 		"stdout=serial,vidconsole\0" \
+ 		"stderr=serial,vidconsole\0"
+-- 
+2.23.0
+

u-boot/default.nix

@@ -38,6 +38,7 @@ in
     (pw "1194524" "071rval4r683d1wxh75nbf22qs554spq8rk0499z6zac0x8q1qvc")
     (pw "1194525" "0biiwimjp25abxqazqbpxx2wh90zgy3k786h484x9wsdvnv4yjl6")
     (pw "1203678" "0l3l88cc9xkxkraql82pfgpx6nqn4dj7cvfaagh5pzfwkxyw0n3p")
+    ./0001-HACK-Add-changing-LEDs-signal-at-boot-on-pinebook-pr.patch
   ];
 })
 .overrideAttrs(oldAttrs: {