# SPDX-License-Identifier: GPL-2.0
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# Makefile for embedded code blobs for Rockchip SoCs
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#
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# These code blobs are emedded into vmlinux and copied into SRAM
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# at times when SDRAM is not available. Each blob is self contained.
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#
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# Some blobs may be linked to expect to run at a very specific address.
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# A good example is resume code blobs that always expect to run in a
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# very specific bit of SRAM that keeps power during sleep. This code
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# is also running with the cache off so it can predict the address it
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# will be at.
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#
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# Other blobs may be linked with -fpic (by adding CFLAGS_file.o := -fpic).
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# These can be located anywhere. I believe gcc will support this by
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# assuming that the .text and .data sections are relative to each other.
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#
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# That brings up the point that all blobs here:
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# - Are generally very small
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# - Generally have code and data jammed together in one blob.
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# - Generally have "parameters" at the beginning that are filled in by
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# the kernel.
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obj-$(CONFIG_PM_SLEEP) += rk3288_resume.bin.o
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targets := rk3288_resume.o rk3288_ddr_resume.o \
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rk3288_resume.elf rk3288_resume.lds \
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rk3288_resume.bin rk3288_resume.bin.o
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# Reset objcopy flags, ARM puts "-O binary" here.
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OBJCOPYFLAGS :=
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# Our embedded code can't handle this flag.
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ifeq ($(CONFIG_FUNCTION_TRACER),y)
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ORIG_CFLAGS := $(KBUILD_CFLAGS)
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KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS))
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endif
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KBUILD_CFLAGS += -fno-stack-protector -fPIC
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# This is the ELF for the embedded binary
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LDFLAGS_rk3288_resume.elf := -Bstatic -nostdlib -T
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$(obj)/rk3288_resume.elf: $(obj)/rk3288_resume.lds \
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$(obj)/rk3288_resume.o \
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$(obj)/rk3288_ddr_resume.o \
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FORCE
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$(call if_changed,ld)
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# Create binary data for the kernel
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OBJCOPYFLAGS_rk3288_resume.bin := -O binary
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$(obj)/rk3288_resume.bin: $(obj)/rk3288_resume.elf FORCE
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$(call if_changed,objcopy)
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# Import the data into the kernel
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OBJCOPYFLAGS_rk3288_resume.bin.o += -B $(ARCH) -I binary -O elf32-littlearm
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$(obj)/rk3288_resume.bin.o: $(obj)/rk3288_resume.bin FORCE
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$(call if_changed,objcopy)
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