riscv: add a generic FIT generator script

Add a generic FIT generator script for RISC-V to generate images
containing U-Boot, OpenSBI FW_DYNAMIC firmware, and optionally one or
more device trees. The location of the OpenSBI firmware binary can be
specified with the OPENSBI environment variable. By default, it is
assumed to be "fw_dynamic.bin", located in the U-Boot top-level. Device
trees are passed as arguments to the generator script. A separate
configuration entry is created for each device tree.

The load addresses of U-Boot and OpenSBI are parsed from the U-Boot
configuration. They can be overwritten with the UBOOT_LOAD_ADDR and
OPENSBI_LOAD_ADDR environment variables.

The script is based on the i.MX (arch/arm/mach-imx/mkimage_fit_atf.sh)
and Allwinner sunxi (board/sunxi/mksunxi_fit_atf.sh) FIT generator
scripts.

Signed-off-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

diff --git a/arch/riscv/lib/mkimage_fit_opensbi.sh b/arch/riscv/lib/mkimage_fit_opensbi.sh
new file mode 100755 (executable)
index 0000000..d6f95e5
--- /dev/null
+++ b/arch/riscv/lib/mkimage_fit_opensbi.sh
@@ -0,0 +1,100 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0+
+#
+# script to generate FIT image source for RISC-V boards with OpenSBI
+# and, optionally, multiple device trees (given on the command line).
+#
+# usage: $0 [<dt_name> [<dt_name] ...]
+
+[ -z "$OPENSBI" ] && OPENSBI="fw_dynamic.bin"
+
+if [ -z "$UBOOT_LOAD_ADDR" ]; then
+       UBOOT_LOAD_ADDR="$(grep "^CONFIG_SYS_TEXT_BASE=" .config | awk 'BEGIN{FS="="} {print $2}')"
+fi
+
+if [ -z "$OPENSBI_LOAD_ADDR" ]; then
+       OPENSBI_LOAD_ADDR="$(grep "^CONFIG_SPL_OPENSBI_LOAD_ADDR=" .config | awk 'BEGIN{FS="="} {print $2}')"
+fi
+
+if [ ! -f $OPENSBI ]; then
+       echo "WARNING: OpenSBI binary \"$OPENSBI\" not found, resulting binary is not functional." >&2
+       OPENSBI=/dev/null
+fi
+
+cat << __HEADER_EOF
+/dts-v1/;
+
+/ {
+       description = "Configuration to load OpenSBI before U-Boot";
+
+       images {
+               uboot {
+                       description = "U-Boot";
+                       data = /incbin/("u-boot-nodtb.bin");
+                       type = "standalone";
+                       os = "U-Boot";
+                       arch = "riscv";
+                       compression = "none";
+                       load = <$UBOOT_LOAD_ADDR>;
+               };
+               opensbi {
+                       description = "RISC-V OpenSBI";
+                       data = /incbin/("$OPENSBI");
+                       type = "firmware";
+                       os = "opensbi";
+                       arch = "riscv";
+                       compression = "none";
+                       load = <$OPENSBI_LOAD_ADDR>;
+                       entry = <$OPENSBI_LOAD_ADDR>;
+               };
+__HEADER_EOF
+
+cnt=1
+for dtname in $*
+do
+       cat << __FDT_IMAGE_EOF
+               fdt_$cnt {
+                       description = "$(basename $dtname .dtb)";
+                       data = /incbin/("$dtname");
+                       type = "flat_dt";
+                       compression = "none";
+               };
+__FDT_IMAGE_EOF
+cnt=$((cnt+1))
+done
+
+cat << __CONF_HEADER_EOF
+       };
+       configurations {
+               default = "config_1";
+
+__CONF_HEADER_EOF
+
+if [ $# -eq 0 ]; then
+cat << __CONF_SECTION_EOF
+               config_1 {
+                       description = "U-Boot FIT";
+                       firmware = "opensbi";
+                       loadables = "uboot";
+               };
+__CONF_SECTION_EOF
+else
+cnt=1
+for dtname in $*
+do
+cat << __CONF_SECTION_EOF
+               config_$cnt {
+                       description = "$(basename $dtname .dtb)";
+                       firmware = "opensbi";
+                       loadables = "uboot";
+                       fdt = "fdt_$cnt";
+               };
+__CONF_SECTION_EOF
+cnt=$((cnt+1))
+done
+fi
+
+cat << __ITS_EOF
+       };
+};
+__ITS_EOF