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6e094232db
Sources files should used for the proper indentation: * use tabs instead of 8 spaces * spaces should never directly before a tab * no whitespace characters at the end of a line These rules were partially not followed in various source files. Signed-off-by: Sven Eckelmann <sven@narfation.org> Link: https://github.com/openwrt/openwrt/pull/20895 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
124 lines
3.8 KiB
Makefile
124 lines
3.8 KiB
Makefile
# rt-loader make file
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# (c) 2025 Markus Stockhausen
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#
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# This is the make file for the rt-loader (aka runtime or realtek loader). It tries to
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# avoid copying files around where possible. Therefore it is controlled by the following
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# input parameters
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#
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# KERNEL_IMG_IN: The filename of an LZMA compressed kernel. If given the loader
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# and the kernel will be concatenated (piggy back loading).
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# FLASH_ADDR: The kernel address in the ROM. If given, the loeader will be
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# created standalone and search a LZMA compressed uImage on the
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# target device starting from this address.
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# KERNEL_IMG_OUT: The filename of the kernel image with the rt-loader prepended.
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# If not given it will be created as image.bin into the BUILD_DIR.
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# BUILD_DIR: The temporary build dir. If not given it will be set to "build".
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#
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# To add it into the OpenWrt toolchain just create the following new build commands
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#
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# define Build/rt-compress
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# $(STAGING_DIR_HOST)/bin/xz --format=lzma -9 --stdout "$@" > "$@.new"
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# mv "$@.new" "$@"
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# endef
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#
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# define Build/rt-loader-piggy-back
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# $(MAKE) all clean -C rt-loader CROSS_COMPILE="$(TARGET_CROSS)" \
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# KERNEL_IMG_IN="$@" KERNEL_IMG_OUT="$@.new" BUILD_DIR="$@.build"
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# mv "$@.new" "$@"
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# endef
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#
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# define Build/rt-loader-standalone
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# $(MAKE) all clean -C rt-loader CROSS_COMPILE="$(TARGET_CROSS)" \
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# FLASH_ADDR=$(FLASH_ADDR) KERNEL_IMG_OUT="$@.new" BUILD_DIR="$@.build"
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# mv "$@.new" "$@"
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# endef
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#
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# Finally use them in new kernel build recipes. E.g. as all-in-one self extracting uImage.
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#
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# define Device/uimage-rt-loader
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# KERNEL/rt-loader := kernel-bin | append-dtb | rt-compress | rt-loader-piggy-back
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# KERNEL := $$(KERNEL/rt-loader) | uImage none
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# KERNEL_INITRAMFS := $$(KERNEL/rt-loader) | uImage none
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# endef
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#
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# Or as direct startable standlone version plus a kernel uImage
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#
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# define Device/rt-loader-uimage
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# FLASH_ADDR := 0xb4000000
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# KERNEL/rt-loader := rt-loader-standalone
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# KERNEL := kernel-bin | append-dtb | rt-compress | uImage lzma
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# endef
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FLASH_ADDR_NONE := 0x0
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FLASH_ADDR ?= $(FLASH_ADDR_NONE)
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CC := $(CROSS_COMPILE)gcc
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LD := $(CROSS_COMPILE)ld
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OBJCOPY := $(CROSS_COMPILE)objcopy
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OBJDUMP := $(CROSS_COMPILE)objdump
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CFLAGS = -fpic -mabicalls -O2 -fno-builtin-printf -Iinclude
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CFLAGS += -DFLASH_ADDR=$(FLASH_ADDR)
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ASFLAGS = -fpic -msoft-float -Iinclude
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LDFLAGS = -static -nostdlib -T linker/linker.ld --no-warn-mismatch
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O_FORMAT = $(shell $(OBJDUMP) -i | head -2 | grep elf32)
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SOURCES = src/startup.S src/main.c src/board.c src/memory.c src/unlzma.c
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BUILD_DIR ?= build
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IMAGE_OBJ := $(BUILD_DIR)/image.o
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IMAGE_ELF := $(BUILD_DIR)/image.elf
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KERNEL_IMG_NONE := $(BUILD_DIR)/empty_kernel.bin
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KERNEL_IMG_IN ?= $(KERNEL_IMG_NONE)
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KERNEL_IMG_OUT ?= $(BUILD_DIR)/image.bin
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OBJECTS_C = $(filter %.c,$(SOURCES))
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OBJECTS_S = $(filter %.S,$(SOURCES))
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OBJECTS := $(OBJECTS_S:.S=.o) $(OBJECTS_C:.c=.o)
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OBJECTS := $(patsubst %.o, $(BUILD_DIR)/%.o, $(OBJECTS)) $(IMAGE_OBJ)
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ifneq ($(MAKECMDGOALS),clean)
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ifeq ($(KERNEL_IMG_IN)$(FLASH_ADDR),$(KERNEL_IMG_NONE)$(FLASH_ADDR_NONE))
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$(error Set either KERNEL_IMG_IN or FLASH_ADDR)
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else ifneq ($(FLASH_ADDR),$(FLASH_ADDR_NONE))
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$(info Create standalone rt-loader, loading uimage from address $(FLASH_ADDR))
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else
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$(info Create piggy backed rt-loader, loading appended kernel binary "$(KERNEL_IMG_IN)")
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endif
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endif
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all: $(KERNEL_IMG_OUT)
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install:
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$(BUILD_DIR)/%.o : %.c
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@mkdir -p $(dir $@)
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$(CC) $(CFLAGS) -c -o $@ $<
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$(BUILD_DIR)/%.o : %.S
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@mkdir -p $(dir $@)
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$(CC) $(ASFLAGS) -c -o $@ $<
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$(IMAGE_OBJ): $(KERNEL_IMG_IN)
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$(OBJCOPY) -I binary -O $(O_FORMAT) --rename-section .data=.kernel $< $@
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$(IMAGE_ELF): $(OBJECTS)
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$(LD) $(LDFLAGS) -o $@ $(OBJECTS)
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$(KERNEL_IMG_OUT): $(IMAGE_ELF)
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$(OBJCOPY) -O binary $< $@
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$(KERNEL_IMG_IN):
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@mkdir -p $(dir $@)
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@echo "DUMMY-KERNEL-IMAGE" > $@
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clean:
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rm -rf $(BUILD_DIR)/
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