add sys-firmware/trusted-firmware-a

sys-firmware/trusted-firmware-a/trusted-firmware-a-2.4.ebuild

@@ -0,0 +1,42 @@
+# Copyright 2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+DESCRIPTION="Trusted Firmware A's BL31"
+HOMEPAGE="https://www.trustedfirmware.org/"
+SRC_URI="https://git.trustedfirmware.org/TF-A/${PN}.git/snapshot/${P}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="BSD"
+SLOT="0"
+KEYWORDS="-* arm64"
+RDEPEND="!sys-firmware/trusted-firmware-a-bin"
+
+TFA_ALL_PLATFORMS=( rk3288 rk3399 sun50i_a64 )
+
+IUSE="${TFA_ALL_PLATFORMS[@]/#/tfa_platforms_}"
+REQUIRED_USE="^^ ( ${IUSE} )"
+
+tfa_get_plat() {
+	local plat
+	for plat in "${TFA_ALL_PLATFORMS[@]}"; do
+		if use "tfa_platforms_${plat}"; then
+			echo ${plat}
+			return 0
+		fi
+	done
+	
+	die "no tfa_platforms_ set"
+}
+
+src_compile() {
+	which arm-none-eabi-gcc || die "arm-none-eabi toolchain not found!"
+	unset CFLAGS CXXFLAGS CPPFLAGS LDFLAGS
+	emake PLAT=$(tfa_get_plat)
+}
+
+src_install() {
+	local plat=$(tfa_get_plat)
+	insinto /usr/share/${PN}/${plat}
+	doins build/${plat}/release/bl31/bl31.elf
+}