odroid-c2: Initial Support

Working:
* Ethernet
* Resize of Data
* RAUC boot marking/fetching
* CMD Line into HASSOS and Linux

Partially working:
* USB (requires 1+ devices in at boot. Seems to be a kernel/dt issue.)

Untested:
* RAUC Update
* HDMI

Not working:
* Homeassistant
** We see:
hassio > ha info
The HTTP request failed with the error: Get http://hassio/homeassistant/info: dial tcp 172.30.32.2:80: getsockopt: connection refused

buildroot-external/package/hardkernel-sbl/Config.in

@@ -0,0 +1,24 @@
+config BR2_PACKAGE_HARDKERNEL_SBL
+	bool "Hardkernel Secure Boot Loader"
+	depends on BR2_TARGET_UBOOT
+	help
+	  Augment uboot for secure loading on hardkernel targets.
+
+if BR2_PACKAGE_HARDKERNEL_SBL
+choice
+	prompt "Target"
+	default BR2_PACKAGE_HARDKERNEL_SBL_ODROID_C2
+
+config BR2_PACKAGE_HARDKERNEL_SBL_ODROID_C2
+	bool "Odroid-C2"
+	help
+	  For the Odroid-C2
+
+config BR2_PACKAGE_HARDKERNEL_SBL_ODROID_XU4
+	bool "Odroid-XU4"
+	help
+	  For the Odroid-XU4. NOT YET IMPLEMENTED!!
+
+endchoice
+
+endif

buildroot-external/package/hardkernel-sbl/hardkernel-sbl.mk

@@ -0,0 +1,39 @@
+################################################################################
+#
+# hardkernel secure boot loader
+#
+################################################################################
+
+HARDKERNEL_SBL_VERSION = 205c7b3259559283161703a1a200b787c2c445a5
+HARDKERNEL_SBL_SOURCE = $(HARDKERNEL_SBL_VERSION).tar.gz
+HARDKERNEL_SBL_SITE = https://github.com/hardkernel/u-boot/archive
+HARDKERNEL_SBL_LICENSE = GPL-2.0+
+HARDKERNEL_SBL_LICENSE_FILES = Licenses/gpl-2.0.txt
+HARDKERNEL_SBL_INSTALL_IMAGES = YES
+HARDKERNEL_SBL_DEPENDENCIES = uboot
+
+
+ifeq ($(BR2_PACKAGE_HARDKERNEL_SBL_ODROID_C2),y)
+HARDKERNEL_SBL_BINS += sd_fuse/bl1.bin.hardkernel \
+                       u-boot.gxbb
+define HARDKERNEL_SBL_BUILD_CMDS
+	$(@D)/fip/fip_create --bl30  $(@D)/fip/gxb/bl30.bin \
+												--bl301 $(@D)/fip/gxb/bl301.bin \
+												--bl31  $(@D)/fip/gxb/bl31.bin \
+												--bl33  $(BINARIES_DIR)/u-boot.bin \
+												$(@D)/fip.bin
+	cat $(@D)/fip/gxb/bl2.package $(@D)/fip.bin > $(@D)/boot_new.bin
+	$(@D)/fip/gxb/aml_encrypt_gxb --bootsig \
+															--input $(@D)/boot_new.bin \
+															--output $(@D)/u-boot.img
+	dd if=$(@D)/u-boot.img of=$(@D)/u-boot.gxbb bs=512 skip=96
+endef
+endif
+
+define HARDKERNEL_SBL_INSTALL_IMAGES_CMDS
+	$(foreach f,$(HARDKERNEL_SBL_BINS), \
+			cp -dpf $(@D)/$(f) $(BINARIES_DIR)/
+	)
+endef
+
+$(eval $(generic-package))