initial buildroot for linux 5.15

package/batman-adv/Config.in

@@ -0,0 +1,38 @@
+comment "batman-adv needs a Linux kernel to be built"
+	depends on !BR2_LINUX_KERNEL
+
+config BR2_PACKAGE_BATMAN_ADV
+	bool "batman-adv"
+	depends on BR2_LINUX_KERNEL
+	help
+	  batman-adv mesh networking kernel module
+	  Note: batman-adv is part of the linux mainline
+	  kernel since version 2.6.38
+
+	  https://www.open-mesh.org/projects/batman-adv/
+
+if BR2_PACKAGE_BATMAN_ADV
+
+config BR2_PACKAGE_BATMAN_ADV_DEBUG
+	bool "enable debugging"
+	help
+	  Enables B.A.T.M.A.N. debugging.
+
+config BR2_PACKAGE_BATMAN_ADV_NC
+	bool "enable network coding"
+	help
+	  Enables B.A.T.M.A.N. network coding.
+	  Note: this requires promiscuous mode on ALL nodes!
+
+	  https://www.open-mesh.org/projects/batman-adv/wiki/NetworkCoding
+
+config BR2_PACKAGE_BATMAN_ADV_BATMAN_V
+	bool "enable B.A.T.M.A.N. V protocol (experimental)"
+	help
+	  Enables B.A.T.M.A.N. V network protocol.
+	  This is the next-gen protocol and is experimental at this
+	  time.
+
+	  https://www.open-mesh.org/projects/batman-adv/wiki/BATMAN_V
+
+endif

package/batman-adv/batman-adv.hash

@@ -0,0 +1,7 @@
+# From https://downloads.open-mesh.org/batman/releases/batman-adv-2021.1/batman-adv-2021.1.tar.gz.sha1
+sha1  27a0dc7cb74b868bc0ab52794ecedd0448f0fb61  batman-adv-2021.1.tar.gz
+
+# Hash for license files
+sha256  5a989ba580897268373bd516b87b588061f344af773a0f6b038a3d8d2af028a1  batman-adv-2021.0.tar.gz
+sha256  cecbf53d1148e13256ac29f8b900655b7fc8dc12d59939a95bc2323ea1747025  LICENSES/preferred/GPL-2.0
+sha256  323c587d0ccf10e376f8bf9a7f31fb4ca6078105194b42e0b1e0ee2bc9bde71f  LICENSES/preferred/MIT

package/batman-adv/batman-adv.mk

@@ -0,0 +1,42 @@
+################################################################################
+#
+# batman-adv
+#
+################################################################################
+
+BATMAN_ADV_VERSION = 2021.1
+BATMAN_ADV_SITE = https://downloads.open-mesh.org/batman/stable/sources/batman-adv
+BATMAN_ADV_LICENSE = GPL-2.0, MIT (batman_adv.h)
+BATMAN_ADV_LICENSE_FILES = LICENSES/preferred/GPL-2.0 LICENSES/preferred/MIT
+
+BATMAN_ADV_CFLAGS = \
+	-I$(@D)/compat-include/ \
+	-I$(@D)/include/ \
+	-include $(@D)/compat.h \
+	-DBATADV_SOURCE_VERSION=\"\\\"$(BATMAN_ADV_VERSION)\\\"\"
+
+# Bridge Loop Avoidance, Distributed Arp Table are always enabled
+BATMAN_ADV_MODULE_MAKE_OPTS = \
+	KVER=$(LINUX_VERSION_PROBED) \
+	INSTALL_MOD_DIR=updates/net/batman-adv \
+	NOSTDINC_FLAGS="$(BATMAN_ADV_CFLAGS)" \
+	CONFIG_BATMAN_ADV=m \
+	CONFIG_BATMAN_ADV_BLA=y \
+	CONFIG_BATMAN_ADV_DAT=y \
+	CONFIG_BATMAN_ADV_MCAST=y \
+	CONFIG_BATMAN_ADV_BATMAN_V=$(if $(BR2_PACKAGE_BATMAN_ADV_BATMAN_V),y,n) \
+	CONFIG_BATMAN_ADV_DEBUG=$(if $(BR2_PACKAGE_BATMAN_ADV_DEBUG),y,n) \
+	CONFIG_BATMAN_ADV_NC=$(if $(BR2_PACKAGE_BATMAN_ADV_NC),y,n)
+
+BATMAN_ADV_MODULE_SUBDIRS = net/batman-adv
+
+define BATMAN_ADV_CONFIGURE_CMDS
+	$(BATMAN_ADV_MODULE_MAKE_OPTS) $(@D)/gen-compat-autoconf.sh $(@D)/compat-autoconf.h
+endef
+
+define BATMAN_ADV_LINUX_CONFIG_FIXUPS
+	$(call KCONFIG_ENABLE_OPT,CONFIG_LIBCRC32C)
+endef
+
+$(eval $(kernel-module))
+$(eval $(generic-package))