Preparing an image for VIA Epia boards

Credits for the GRUB2 setup go to [1]; in the end it's actually a bit
simpler.

[1] http://lists.busybox.net/pipermail/buildroot/2014-April/095234.html

Change-Id: I47a30be4a62f32d09c5c329809e2f958d05d6c64
diff --git a/configs/czechlight_epia_defconfig b/configs/czechlight_epia_defconfig
new file mode 100644
index 0000000..cc3d9b6
--- /dev/null
+++ b/configs/czechlight_epia_defconfig
@@ -0,0 +1,53 @@
+BR2_x86_i686=y
+BR2_KERNEL_MIRROR="http://ftp.fi.muni.cz/pub/linux/kernel/"
+BR2_GNU_MIRROR="http://ftp.fi.muni.cz/pub/gnu/"
+BR2_CPAN_MIRROR="http://ftp.fi.muni.cz/pub/CPAN/"
+BR2_OPTIMIZE_2=y
+BR2_SSP_STRONG=y
+BR2_TOOLCHAIN_BUILDROOT_GLIBC=y
+BR2_KERNEL_HEADERS_4_9=y
+BR2_GLIBC_VERSION_2_25=y
+BR2_BINUTILS_VERSION_2_28_X=y
+BR2_GCC_VERSION_6_X=y
+BR2_TOOLCHAIN_BUILDROOT_CXX=y
+BR2_GCC_ENABLE_LTO=y
+BR2_GCC_ENABLE_GRAPHITE=y
+BR2_TARGET_GENERIC_HOSTNAME="czechlight"
+BR2_TARGET_GENERIC_ISSUE="Welcome to CzechLight"
+BR2_TARGET_GENERIC_PASSWD_SHA256=y
+BR2_INIT_SYSTEMD=y
+BR2_SYSTEM_DHCP="eth0"
+BR2_ENABLE_LOCALE_WHITELIST="C en_US en_US.utf8"
+BR2_ROOTFS_OVERLAY="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/common/overlay/"
+BR2_ROOTFS_POST_IMAGE_SCRIPT="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/epia/post-image.sh"
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.9.20"
+BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG=y
+BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/common/kconfig $(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/epia/kconfig"
+BR2_LINUX_KERNEL_INSTALL_TARGET=y
+BR2_PACKAGE_BUSYBOX_CONFIG_FRAGMENT_FILES="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/common/busybox-config"
+BR2_PACKAGE_LSOF=y
+BR2_PACKAGE_STRACE=y
+BR2_PACKAGE_AVAHI=y
+BR2_PACKAGE_AVAHI_DAEMON=y
+BR2_PACKAGE_OPENSSH=y
+BR2_PACKAGE_BASH=y
+BR2_PACKAGE_SYSTEMD_COREDUMP=y
+# BR2_PACKAGE_SYSTEMD_HWDB is not set
+BR2_PACKAGE_SYSTEMD_LOGIND=y
+# BR2_PACKAGE_SYSTEMD_MYHOSTNAME is not set
+BR2_PACKAGE_SYSTEMD_RANDOMSEED=y
+BR2_PACKAGE_SYSTEMD_SYSUSERS=y
+BR2_PACKAGE_UTIL_LINUX_AGETTY=y
+BR2_PACKAGE_VIM=y
+# BR2_PACKAGE_VIM_RUNTIME is not set
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_4=y
+BR2_TARGET_ROOTFS_EXT2_BLOCKS=131072
+# BR2_TARGET_ROOTFS_TAR is not set
+BR2_TARGET_GRUB2=y
+BR2_PACKAGE_HOST_DOSFSTOOLS=y
+BR2_PACKAGE_HOST_GENIMAGE=y
+BR2_PACKAGE_HOST_MTOOLS=y
+CZECHLIGHT_NETCONF=y