[PATCH v4 11/13] mach-snapdragon: Add commands to create wrapper ELF

[Varadarajan Narayanan]

The IPQ5210 boot ROM expects the SPL binary image to be embedded within
an ELF along with additional binaries. Hence add the relevant commands
and linker script needed to convert u-boot-spl.bin to the expected
format.

Signed-off-by: Varadarajan Narayanan <varadarajan.narayanan at oss.qualcomm.com>
---
v4: Use $(obj) for u-boot-spl.wrap-elf

v3: s/a image/an image/
    Add SPDX header to linker script
    Pre-process linker script to use IMAGE_TEXT_BASE instead of hard coding it
---
 arch/arm/mach-snapdragon/Kconfig              |  7 ++++++
 .../mach-snapdragon/ipq5210-spl-wrap-elf.lds  | 18 ++++++++++++++
 scripts/Makefile.xpl                          | 24 +++++++++++++++++++
 3 files changed, 49 insertions(+)
 create mode 100644 arch/arm/mach-snapdragon/ipq5210-spl-wrap-elf.lds

diff --git a/arch/arm/mach-snapdragon/Kconfig b/arch/arm/mach-snapdragon/Kconfig
index d3de8693b5a..d94cb6206e8 100644
--- a/arch/arm/mach-snapdragon/Kconfig
+++ b/arch/arm/mach-snapdragon/Kconfig
@@ -42,4 +42,11 @@ config SYS_CONFIG_NAME
 	  Based on this option include/configs/<CONFIG_SYS_CONFIG_NAME>.h header
 	  will be used for board configuration.
 
+config SPL_WRAPPER_ELF
+	bool "Create wrapper ELF for applicable platforms"
+	depends on SPL
+	help
+	  Some platforms embed the U-Boot SPL binary within an ELF as a segment.
+	  Additional tools are used to convert this ELF into an image that is
+	  usable for the boot ROM.
 endif
diff --git a/arch/arm/mach-snapdragon/ipq5210-spl-wrap-elf.lds b/arch/arm/mach-snapdragon/ipq5210-spl-wrap-elf.lds
new file mode 100644
index 00000000000..5a582e65ca0
--- /dev/null
+++ b/arch/arm/mach-snapdragon/ipq5210-spl-wrap-elf.lds
@@ -0,0 +1,18 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0
+ * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+ */
+PHDRS {
+	ptype PT_LOAD FLAGS(0x7);
+}
+
+ENTRY(_entry)
+
+SECTIONS {
+	. = IMAGE_TEXT_BASE;
+	_entry = . ;
+	data : {
+		*(.data)
+		. = ALIGN(4);
+	} :ptype
+}
diff --git a/scripts/Makefile.xpl b/scripts/Makefile.xpl
index a3fd3e1375f..6e9f24b748a 100644
--- a/scripts/Makefile.xpl
+++ b/scripts/Makefile.xpl
@@ -256,6 +256,26 @@ MKIMAGEFLAGS_boot.bin = -T zynqmpimage -R $(srctree)/$(CONFIG_BOOT_INIT_FILE) \
 	-n "$(shell cd $(srctree); readlink -f $(CONFIG_PMUFW_INIT_FILE))"
 endif
 
+ifeq ($(CONFIG_SPL_WRAPPER_ELF),y)
+# Convert ELF to object file
+OBJCOPYFLAGS_$(SPL_BIN).bin.o = -I binary -O elf64-littleaarch64
+
+# Wrap the object file inside a ELF
+QCOM_SPL_SOC = $(shell echo $(notdir "$(CONFIG_DEFAULT_DEVICE_TREE)") | cut -f1 -d-)
+QCOM_SPL_WRAP_LDS = $(srctree)/arch/arm/mach-snapdragon/$(QCOM_SPL_SOC)-spl-wrap-elf.lds
+LDFLAGS_$(SPL_BIN).wrap-elf = -T $(obj)/$(SPL_BIN).wrap-elf.lds
+
+$(obj)/$(SPL_BIN).wrap-elf.lds: $(QCOM_SPL_WRAP_LDS) FORCE
+	$(call if_changed_dep,cpp_lds)
+
+$(obj)/$(SPL_BIN).bin.o: $(obj)/$(SPL_BIN).bin $(obj)/$(SPL_BIN).wrap-elf.lds FORCE
+	$(call if_changed,objcopy)
+
+$(obj)/$(SPL_BIN).wrap-elf: $(obj)/$(SPL_BIN).bin.o FORCE
+	$(call if_changed,ld)
+
+endif
+
 $(obj)/$(SPL_BIN)-align.bin: $(obj)/$(SPL_BIN).bin
 	@dd if=$< of=$@ conv=sync bs=4 2>/dev/null;
 
@@ -302,6 +322,10 @@ INPUTS-$(CONFIG_ARCH_ZYNQMP)	+= $(obj)/boot.bin
 
 INPUTS-$(CONFIG_ARCH_MEDIATEK)	+= $(obj)/u-boot-spl-mtk.bin
 
+ifeq ($(CONFIG_ARCH_SNAPDRAGON),y)
+INPUTS-$(CONFIG_SPL_WRAPPER_ELF) += $(obj)/u-boot-spl.wrap-elf
+endif
+
 all:	$(INPUTS-y)
 
 quiet_cmd_cat = CAT     $@
-- 
2.34.1