44c9225729
Introduce XIP (eXecute In Place) support for RISC-V platforms. It allows code to be executed directly from non-volatile storage directly addressable by the CPU, such as QSPI NOR flash which can be found on many RISC-V platforms. This makes way for significant optimization of RAM footprint. The XIP kernel is not compressed since it has to run directly from flash, so it will occupy more space on the non-volatile storage. The physical flash address used to link the kernel object files and for storing it has to be known at compile time and is represented by a Kconfig option. XIP on RISC-V will for the time being only work on MMU-enabled kernels. Signed-off-by: Vitaly Wool <vitaly.wool@konsulko.com> [Alex: Rebase on top of "Move kernel mapping outside the linear mapping" ] Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> [Palmer: disable XIP for allyesconfig] Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
69 lines
1.8 KiB
Makefile
69 lines
1.8 KiB
Makefile
#
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# arch/riscv/boot/Makefile
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#
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# This file is included by the global makefile so that you can add your own
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# architecture-specific flags and dependencies.
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#
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# This file is subject to the terms and conditions of the GNU General Public
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# License. See the file "COPYING" in the main directory of this archive
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# for more details.
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#
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# Copyright (C) 2018, Anup Patel.
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# Author: Anup Patel <anup@brainfault.org>
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#
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# Based on the ia64 and arm64 boot/Makefile.
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#
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KCOV_INSTRUMENT := n
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OBJCOPYFLAGS_Image :=-O binary -R .note -R .note.gnu.build-id -R .comment -S
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OBJCOPYFLAGS_xipImage :=-O binary -R .note -R .note.gnu.build-id -R .comment -S
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targets := Image Image.* loader loader.o loader.lds loader.bin
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targets := Image Image.* loader loader.o loader.lds loader.bin xipImage
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ifeq ($(CONFIG_XIP_KERNEL),y)
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quiet_cmd_mkxip = $(quiet_cmd_objcopy)
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cmd_mkxip = $(cmd_objcopy)
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$(obj)/xipImage: vmlinux FORCE
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$(call if_changed,mkxip)
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@$(kecho) ' Physical Address of xipImage: $(CONFIG_XIP_PHYS_ADDR)'
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endif
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$(obj)/Image: vmlinux FORCE
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$(call if_changed,objcopy)
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$(obj)/Image.gz: $(obj)/Image FORCE
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$(call if_changed,gzip)
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$(obj)/loader.o: $(src)/loader.S $(obj)/Image
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$(obj)/loader: $(obj)/loader.o $(obj)/Image $(obj)/loader.lds FORCE
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$(Q)$(LD) -T $(obj)/loader.lds -o $@ $(obj)/loader.o
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$(obj)/Image.bz2: $(obj)/Image FORCE
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$(call if_changed,bzip2)
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$(obj)/Image.lz4: $(obj)/Image FORCE
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$(call if_changed,lz4)
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$(obj)/Image.lzma: $(obj)/Image FORCE
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$(call if_changed,lzma)
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$(obj)/Image.lzo: $(obj)/Image FORCE
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$(call if_changed,lzo)
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$(obj)/loader.bin: $(obj)/loader FORCE
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$(call if_changed,objcopy)
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install:
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$(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \
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$(obj)/Image System.map "$(INSTALL_PATH)"
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zinstall:
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$(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \
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$(obj)/Image.gz System.map "$(INSTALL_PATH)"
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