From 44c922572952d89a1ed15764f2b373ba62692865 Mon Sep 17 00:00:00 2001 From: Vitaly Wool Date: Tue, 13 Apr 2021 02:35:14 -0400 Subject: RISC-V: enable XIP 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 [Alex: Rebase on top of "Move kernel mapping outside the linear mapping" ] Signed-off-by: Alexandre Ghiti [Palmer: disable XIP for allyesconfig] Signed-off-by: Palmer Dabbelt --- arch/riscv/boot/Makefile | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'arch/riscv/boot') diff --git a/arch/riscv/boot/Makefile b/arch/riscv/boot/Makefile index 03404c84f971..6bf299f70c27 100644 --- a/arch/riscv/boot/Makefile +++ b/arch/riscv/boot/Makefile @@ -17,8 +17,21 @@ KCOV_INSTRUMENT := n OBJCOPYFLAGS_Image :=-O binary -R .note -R .note.gnu.build-id -R .comment -S +OBJCOPYFLAGS_xipImage :=-O binary -R .note -R .note.gnu.build-id -R .comment -S targets := Image Image.* loader loader.o loader.lds loader.bin +targets := Image Image.* loader loader.o loader.lds loader.bin xipImage + +ifeq ($(CONFIG_XIP_KERNEL),y) + +quiet_cmd_mkxip = $(quiet_cmd_objcopy) +cmd_mkxip = $(cmd_objcopy) + +$(obj)/xipImage: vmlinux FORCE + $(call if_changed,mkxip) + @$(kecho) ' Physical Address of xipImage: $(CONFIG_XIP_PHYS_ADDR)' + +endif $(obj)/Image: vmlinux FORCE $(call if_changed,objcopy) -- cgit v1.2.3