[Buildroot] [PATCH 1/3] board/freescale/imx: Add helper to generate fw binary

[Xavier Roumegue]

This script aims to create an imx compatible boot image embedding
mainline components, using only upstream uboot mkimage tool, avoiding
dependencies on proprietary imx mkimage.

Mainline u-boot can generate a bootable image, but SPL soc proprietary
firmware dependencies have to be copied on uboot root dir.

This script prevents additional buildroot uboot recipe hacking to handle
custom SoC uboot build process.

The script actions summary is:
- Append DDR4 firmware to uboot spl binary
- Generate imx mkimage configuration file, extracting entry points from
  relevant elf files on the fly.
- Generate imx boot image using uboot upstream mkimage tool

Signed-off-by: Xavier Roumegue <xroumegue at gmail.com>
---
 .../common/imx/imx8-generate-fw-image.sh      | 52 +++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100755 board/freescale/common/imx/imx8-generate-fw-image.sh

diff --git a/board/freescale/common/imx/imx8-generate-fw-image.sh b/board/freescale/common/imx/imx8-generate-fw-image.sh
new file mode 100755
index 0000000000..eb9e96265b
--- /dev/null
+++ b/board/freescale/common/imx/imx8-generate-fw-image.sh
@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+
+get_entry()
+{
+    local elf_file=$1
+    readelf -h "$elf_file" | sed -e '/Entry/!d;s/.*:.*\(0x[0-9a-fA-F]\)/\1/g'
+}
+
+gen_cfg_file()
+{
+cat <<EOF > "$CFG_OUTFILE"
+#define __ASSEMBLY__
+
+FIT
+BOOT_FROM	sd
+LOADER		${SPL_DDR_BIN}	${SPL_ENTRY}
+SECOND_LOADER	${UBOOT_BIN}		${UBOOT_ENTRY} 0x60000
+
+EOF
+}
+
+gen_1stloader_bin()
+{
+    SPL_BIN_PAD="$(mktemp --suffix spl_pad.bin)"
+    dd if="${SPL_BIN}" of="${SPL_BIN_PAD}"  bs=4 conv=sync
+    cat "${SPL_BIN_PAD}" "${DDR_FW_BIN}" > "${SPL_DDR_BIN}"
+}
+
+gen_fw_image()
+{
+    "${HOST_DIR}"/bin/mkimage -n "${CFG_OUTFILE}" -T imx8mimage -e "${SPL_ENTRY}" -d "${UBOOT_BIN}" "${FLASH_BIN}"
+
+}
+main()
+{
+    UBOOT_BIN="${BINARIES_DIR}/u-boot.itb"
+    UBOOT_ELF="${BINARIES_DIR}/u-boot"
+    SPL_DDR_BIN="${BINARIES_DIR}/u-boot-spl-ddr.bin"
+    SPL_BIN="${BINARIES_DIR}/u-boot-spl.bin"
+    SPL_ELF="${BINARIES_DIR}/u-boot-spl"
+    CFG_OUTFILE="${BINARIES_DIR}/bootimage.cfg"
+    FLASH_BIN="${BINARIES_DIR}/imx8-boot-sd.bin"
+    UBOOT_ENTRY="$(get_entry "${UBOOT_ELF}")"
+    SPL_ENTRY="$(get_entry "${SPL_ELF}")"
+    DDR_FW_BIN="${BINARIES_DIR}/lpddr4_pmu_train_fw.bin"
+
+    gen_1stloader_bin
+    gen_cfg_file
+    gen_fw_image
+}
+
+main "$@"
-- 
2.25.1