Initial support Odroid N2 / Linux 5.4 (#523)

* Initial version Odroid N2

Signed-off-by: Pascal Vizeli <pvizeli@syshack.ch>

* fix some issue

* optimize

* cleanup kernel config

* Fix HDMI output

* Migrate to upstream u-boot

* Use own HA image

* Add kernel for odroid xu4

* Add N2 to release pipeline

* Use uboot 2020.01 / fix version hardkernel

* Fix image

buildroot-external/board/hardkernel/odroid-n2/boot-env.txt

@@ -0,0 +1,84 @@
+
+
+# Custom modeline!
+# To use custom modeline you need to disable all the below resolutions
+# and setup your own!
+# For more information check our wiki:
+# https://wiki.odroid.com/odroid-n2/application_note/software/set_display_mode
+
+# HDMI Mode
+# Resolution Configuration
+#    Symbol             | Resolution
+# ----------------------+-------------
+#    "480x320p60hz"     | 480x320 Progressive 60Hz
+#    "480p60hz"         | 720x480 Progressive 60Hz
+#    "576p50hz"         | 720x576 Progressive 50Hz
+#    "720p60hz"         | 1280x720 Progressive 60Hz
+#    "720p50hz"         | 1280x720 Progressive 50Hz
+#    "1080p60hz"        | 1920x1080 Progressive 60Hz
+#    "1080p50hz"        | 1920x1080 Progressive 50Hz
+#    "1080p30hz"        | 1920x1080 Progressive 30Hz
+#    "1080p24hz"        | 1920x1080 Progressive 24Hz
+#    "1080i60hz"        | 1920x1080 Interlaced 60Hz
+#    "1080i50hz"        | 1920x1080 Interlaced 50Hz
+#    "2160p60hz"        | 3840x2160 Progressive 60Hz
+#    "2160p50hz"        | 3840x2160 Progressive 50Hz
+#    "2160p30hz"        | 3840x2160 Progressive 30Hz
+#    "2160p25hz"        | 3840x2160 Progressive 25Hz
+#    "2160p24hz"        | 3840x2160 Progressive 24Hz
+#    "smpte24hz"        | 3840x2160 Progressive 24Hz SMPTE
+#    "2160p60hz420"     | 3840x2160 Progressive 60Hz YCbCr 4:2:0
+#    "2160p50hz420"     | 3840x2160 Progressive 50Hz YCbCr 4:2:0
+#    "640x480p60hz"     | 640x480 Progressive 60Hz
+#    "800x480p60hz"     | 800x480 Progressive 60Hz
+#    "800x600p60hz"     | 800x600 Progressive 60Hz
+#    "1024x600p60hz"    | 1024x600 Progressive 60Hz
+#    "1024x768p60hz"    | 1024x768 Progressive 60Hz
+#    "1280x800p60hz"    | 1280x800 Progressive 60Hz
+#    "1280x1024p60hz"   | 1280x1024 Progressive 60Hz
+#    "1360x768p60hz"    | 1360x768 Progressive 60Hz
+#    "1440x900p60hz"    | 1440x900 Progressive 60Hz
+#    "1600x900p60hz"    | 1600x900 Progressive 60Hz
+#    "1600x1200p60hz"   | 1600x1200 Progressive 60Hz
+#    "1680x1050p60hz"   | 1680x1050 Progressive 60Hz
+#    "1920x1200p60hz"   | 1920x1200 Progressive 60Hz
+#    "2560x1080p60hz"   | 2560x1080 Progressive 60Hz
+#    "2560x1440p60hz"   | 2560x1440 Progressive 60Hz
+#    "2560x1600p60hz"   | 2560x1600 Progressive 60Hz
+#    "3440x1440p60hz"   | 3440x1440 Progressive 60Hz
+hdmimode=1080p60hz
+ 
+# Overscan percentage
+# This value scales down the actual screen size by the percentage below
+# valid range is 80 to 100
+overscan=100
+ 
+### voutmode : hdmi or dvi
+#voutmode=dvi
+voutmode=hdmi
+ 
+# HPD enable/disable option
+disablehpd="false"
+ 
+# max cpu frequency for big core, A73 in MHz unit
+# 1.8 GHz, default value
+#max_freq_a73=2004  # 2.004 GHz
+#max_freq_a73=1908  # 1.908 GHz
+#max_freq_a73=1704  # 1.704 GHz
+max_freq_a73=1800
+ 
+# max cpu frequency for little core, A53 in MHz unit
+# 1.896 GHz, default value
+#max_freq_a53=1992  # 1.992 GHz
+#max_freq_a53=1704  # 1.704 GHz
+max_freq_a53=1896
+ 
+ 
+# max cpu-cores
+# Note:
+# CPU's 0 and 1 are the A53 (small cores)
+# CPU's 2 to 5 are the A73 (big cores)
+# Lowering this value disables only the bigger cores (the last cores).
+#maxcpus=4
+#maxcpus=5
+maxcpus=6