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8e1c9fe243
This adds a boot method for loading the next stage from the host. It is mostly modeled off of spl_load_image_ext. I am not really sure why/how spl_load_image_fat uses three different methods to load the image, but the simple case seems to work OK for now. To control the presence of this boot method, we add a config symbol. While we're at it, we update the original semihosting config symbol. I think semihosting has some advantages of other forms of JTAG boot. Common other ways to boot from JTAG include: - Implementing DDR initialization through JTAG (typically with dozens of lines of TCL) and then loading U-Boot. The DDR initialization typically uses hard-coded register writes, and is not easily adapted to different boards. BOOT_DEVICE_SMH allows booting with SPL, leveraging U-Boot's existing DDR initialization code. This is the method used by NXP's CodeWarrior IDE on Layerscape processors (see AN12270). - Loading a bootloader into SDRAM, waiting for it to initialize DDR, and then loading U-Boot. This is tricky, because the debugger must stop the boot after the bootloader has completed its work. Trying to load U-Boot too early can cause failure to boot. This is the method used by Xilinx with its Zynq(MP) processors. - Loading SPL with BOOT_DEVICE_RAM and breaking before SPL loads the image to load U-Boot at the appropriate place. This can be a bit tricky, because the load address is dependent on the header size. An elf with symbols must also be used in order to stop at the appropriate point. BOOT_DEVICE_SMH can be viewed as an extension of this process, where SPL automatically stops and tells the host where to place the image. Signed-off-by: Sean Anderson <sean.anderson@seco.com>
125 lines
3.2 KiB
Makefile
125 lines
3.2 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0+
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#
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# (C) Copyright 2002-2006
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# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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lib-$(CONFIG_USE_PRIVATE_LIBGCC) += ashldi3.o ashrdi3.o lshrdi3.o \
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lib1funcs.o uldivmod.o div0.o \
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div64.o muldi3.o
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ifdef CONFIG_CPU_V7M
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obj-y += vectors_m.o crt0.o
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else ifdef CONFIG_ARM64
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obj-y += crt0_64.o
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else
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obj-y += vectors.o crt0.o
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endif
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ifdef CONFIG_ARM64
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obj-y += setjmp_aarch64.o
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else
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obj-y += setjmp.o
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endif
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ifndef CONFIG_SPL_BUILD
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ifdef CONFIG_ARM64
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obj-y += relocate_64.o
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else
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obj-y += relocate.o
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endif
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obj-$(CONFIG_CPU_V7M) += cmd_boot.o
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obj-$(CONFIG_OF_LIBFDT) += bootm-fdt.o
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obj-$(CONFIG_CMD_BOOTI) += bootm.o image.o
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obj-$(CONFIG_CMD_BOOTM) += bootm.o
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obj-$(CONFIG_CMD_BOOTZ) += bootm.o zimage.o
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obj-$(CONFIG_SYS_L2_PL310) += cache-pl310.o
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else
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obj-$(CONFIG_$(SPL_TPL_)FRAMEWORK) += spl.o
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obj-$(CONFIG_SPL_FRAMEWORK) += zimage.o
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obj-$(CONFIG_OF_LIBFDT) += bootm-fdt.o
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endif
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ifdef CONFIG_ARM64
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obj-$(CONFIG_$(SPL_TPL_)USE_ARCH_MEMSET) += memset-arm64.o
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obj-$(CONFIG_$(SPL_TPL_)USE_ARCH_MEMCPY) += memcpy-arm64.o
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else
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obj-$(CONFIG_$(SPL_TPL_)USE_ARCH_MEMSET) += memset.o
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obj-$(CONFIG_$(SPL_TPL_)USE_ARCH_MEMCPY) += memcpy.o
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endif
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obj-$(CONFIG_$(SPL_TPL_)SEMIHOSTING) += semihosting.o
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obj-y += bdinfo.o
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obj-y += sections.o
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CFLAGS_REMOVE_sections.o := $(LTO_CFLAGS)
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obj-y += stack.o
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ifdef CONFIG_CPU_V7M
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obj-y += interrupts_m.o
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else ifdef CONFIG_ARM64
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obj-$(CONFIG_FSL_LAYERSCAPE) += ccn504.o
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ifneq ($(CONFIG_GICV2)$(CONFIG_GICV3),)
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obj-y += gic_64.o
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endif
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obj-$(CONFIG_GIC_V3_ITS) += gic-v3-its.o
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obj-y += interrupts_64.o
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else
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obj-y += interrupts.o
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endif
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ifndef CONFIG_$(SPL_TPL_)SYSRESET
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obj-y += reset.o
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endif
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obj-y += cache.o
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obj-$(CONFIG_SYS_ARM_CACHE_CP15) += cache-cp15.o
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CFLAGS_REMOVE_cache-cp15.o := $(LTO_CFLAGS)
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obj-y += psci-dt.o
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obj-$(CONFIG_DEBUG_LL) += debug.o
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# For EABI conformant tool chains, provide eabi_compat()
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ifneq (,$(findstring -mabi=aapcs-linux,$(PLATFORM_CPPFLAGS)))
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extra-y += eabi_compat.o
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endif
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# some files can only build in ARM or THUMB2, not THUMB1
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ifdef CONFIG_$(SPL_)SYS_THUMB_BUILD
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asflags-$(CONFIG_HAS_THUMB2) += -DCONFIG_THUMB2_KERNEL
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ifndef CONFIG_HAS_THUMB2
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# for C files, just apend -marm, which will override previous -mthumb*
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ifndef CONFIG_ARM64
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CFLAGS_cache.o := -marm
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CFLAGS_cache-cp15.o := -marm
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endif
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# For .S, drop -mthumb* and other thumb-related options.
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# CFLAGS_REMOVE_* would not have an effet, so AFLAGS_REMOVE_*
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# was implemented and is used here.
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# Also, define ${target}_NO_THUMB_BUILD for these two targets
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# so that the code knows it should not use Thumb.
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AFLAGS_REMOVE_memset.o := -mthumb -mthumb-interwork
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AFLAGS_REMOVE_memcpy.o := -mthumb -mthumb-interwork
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AFLAGS_memset.o := -DMEMSET_NO_THUMB_BUILD
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AFLAGS_memcpy.o := -DMEMCPY_NO_THUMB_BUILD
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endif
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endif
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# For building EFI apps
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CFLAGS_$(EFI_CRT0) := $(CFLAGS_EFI)
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CFLAGS_REMOVE_$(EFI_CRT0) := $(CFLAGS_NON_EFI)
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CFLAGS_$(EFI_RELOC) := $(CFLAGS_EFI)
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CFLAGS_REMOVE_$(EFI_RELOC) := $(CFLAGS_NON_EFI)
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extra-$(CONFIG_CMD_BOOTEFI_HELLO_COMPILE) += $(EFI_CRT0) $(EFI_RELOC)
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# TODO: As of v2019.01 the relocation code for the EFI application cannot
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# be built on ARMv7-M.
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ifndef CONFIG_CPU_V7M
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#extra-$(CONFIG_CMD_BOOTEFI_SELFTEST) += $(EFI_CRT0) $(EFI_RELOC)
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endif
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extra-$(CONFIG_EFI) += $(EFI_CRT0) $(EFI_RELOC)
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