crust: add SCP firmware for sunxi SoCs

Crust improves battery life and thermal performance by implementing a deep
sleep state. During deep sleep, the CPU cores, the DRAM controller, and most
onboard peripherals are powered down, reducing power consumption by 80% or more
compared to an idle device. On boards without a PMIC, Crust is also responsible
for orderly power-off and power-on of the device.

packages/tools/crust/package.mk

@@ -0,0 +1,43 @@
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2020-present Team LibreELEC (https://libreelec.tv)
+
+PKG_NAME="crust"
+PKG_VERSION="18f74f493690844a4392dc28d879abd4ba995513"
+PKG_SHA256="7b8f004933054b6f394db532bf16fd9c3b42bd606f3e603f162f358436c4c3d8"
+PKG_ARCH="arm aarch64"
+PKG_LICENSE="BSD-3c"
+PKG_SITE="https://github.com/crust-firmware/crust"
+PKG_URL="https://github.com/crust-firmware/crust/archive/${PKG_VERSION}.tar.gz"
+PKG_DEPENDS_TARGET="gcc-or1k-linux:host"
+PKG_LONGDESC="Crust: Libre SCP firmware for Allwinner sunxi SoCs"
+PKG_TOOLCHAIN="manual"
+
+pre_configure_target() {
+  export CROSS_COMPILE="$TOOLCHAIN/lib/gcc-or1k-linux/bin/or1k-linux-"
+}
+
+make_target() {
+  CRUST_CONFIG=$($ROOT/$SCRIPTS/uboot_helper $PROJECT $DEVICE $UBOOT_SYSTEM crust_config)
+
+  if [ -z "$CRUST_CONFIG" ]; then
+    echo "crust_config must be set to build an image"
+    echo "see './scripts/uboot_helper' for more information"
+    exit 1
+  fi
+
+  make distclean
+  if [ "${BUILD_WITH_DEBUG}" = "yes" ]; then
+    echo "CONFIG_DEBUG_LOG=y" >> configs/$CRUST_CONFIG
+  else
+    echo "CONFIG_SERIAL=n" >> configs/$CRUST_CONFIG
+  fi
+  # Boards with a PMIC need to disable CONFIG_PMIC_SHUTDOWN to get CIR wakeup from suspend
+  echo "CONFIG_PMIC_SHUTDOWN=n" >> configs/$CRUST_CONFIG
+  make $CRUST_CONFIG
+  make scp
+}
+
+makeinstall_target() {
+  mkdir -p $INSTALL/usr/share/bootloader
+  cp -a build/scp/scp.bin $INSTALL/usr/share/bootloader
+}