mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-26 14:40:55 +07:00
da844a8177
Device trees allow specification of hardware topology and device parameters at runtime instead of hard-coding them in platform setup code. This allows running single binary kernel on a range of compatible boards. New boot parameters tag BP_TAG_FDT is allocated and a pointer to flat device tree is passed in it. Note that current interrupt mapping scheme uses single cell for interrupt identification. That means that IRQ numbers used in DTS must be CPU internal IRQ numbers, not external. It is possible to extend interrupt identification to two cells, and use second cell to tell external IRQ numbers form internal. That would allow to use single DTS on multiple boards with different mapping of external IRQ numbers. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
102 lines
2.6 KiB
Makefile
102 lines
2.6 KiB
Makefile
#
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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) 2001 - 2005 Tensilica Inc.
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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. Remember to do have actions
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# for "archclean" and "archdep" for cleaning up and making dependencies for
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# this architecture
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# Core configuration.
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# (Use VAR=<xtensa_config> to use another default compiler.)
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variant-$(CONFIG_XTENSA_VARIANT_FSF) := fsf
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variant-$(CONFIG_XTENSA_VARIANT_DC232B) := dc232b
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variant-$(CONFIG_XTENSA_VARIANT_S6000) := s6000
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variant-$(CONFIG_XTENSA_VARIANT_LINUX_CUSTOM) := custom
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VARIANT = $(variant-y)
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export VARIANT
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# Test for cross compiling
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ifneq ($(VARIANT),)
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COMPILE_ARCH = $(shell uname -m)
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ifneq ($(COMPILE_ARCH), xtensa)
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ifndef CROSS_COMPILE
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CROSS_COMPILE = xtensa_$(VARIANT)-
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endif
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endif
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endif
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# Platform configuration
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platform-$(CONFIG_XTENSA_PLATFORM_XT2000) := xt2000
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platform-$(CONFIG_XTENSA_PLATFORM_ISS) := iss
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platform-$(CONFIG_XTENSA_PLATFORM_S6105) := s6105
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PLATFORM = $(platform-y)
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export PLATFORM
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# temporarily until string.h is fixed
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KBUILD_CFLAGS += -ffreestanding -D__linux__
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KBUILD_CFLAGS += -pipe -mlongcalls
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KBUILD_CFLAGS += $(call cc-option,-mforce-no-pic,)
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ifneq ($(CONFIG_LD_NO_RELAX),)
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LDFLAGS := --no-relax
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endif
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vardirs := $(patsubst %,arch/xtensa/variants/%/,$(variant-y))
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plfdirs := $(patsubst %,arch/xtensa/platforms/%/,$(platform-y))
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ifeq ($(KBUILD_SRC),)
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KBUILD_CPPFLAGS += $(patsubst %,-I%include,$(vardirs) $(plfdirs))
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else
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KBUILD_CPPFLAGS += $(patsubst %,-I$(srctree)/%include,$(vardirs) $(plfdirs))
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endif
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KBUILD_DEFCONFIG := iss_defconfig
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# Only build variant and/or platform if it includes a Makefile
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buildvar := $(shell test -e $(srctree)/arch/xtensa/variants/$(VARIANT)/Makefile && echo arch/xtensa/variants/$(VARIANT)/)
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buildplf := $(shell test -e $(srctree)/arch/xtensa/platforms/$(PLATFORM)/Makefile && echo arch/xtensa/platforms/$(PLATFORM)/)
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# Find libgcc.a
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LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
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head-y := arch/xtensa/kernel/head.o
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core-y += arch/xtensa/kernel/ arch/xtensa/mm/
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core-y += $(buildvar) $(buildplf)
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libs-y += arch/xtensa/lib/ $(LIBGCC)
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ifneq ($(CONFIG_BUILTIN_DTB),"")
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core-y += arch/xtensa/boot/
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endif
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boot := arch/xtensa/boot
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all: zImage
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bzImage : zImage
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zImage: vmlinux
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$(Q)$(MAKE) $(build)=$(boot) $@
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%.dtb:
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$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
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define archhelp
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@echo '* zImage - Compressed kernel image (arch/xtensa/boot/images/zImage.*)'
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endef
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