2 # Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
4 # Redistribution and use in source and binary forms, with or without
5 # modification, are permitted provided that the following conditions are met:
7 # Redistributions of source code must retain the above copyright notice, this
8 # list of conditions and the following disclaimer.
10 # Redistributions in binary form must reproduce the above copyright notice,
11 # this list of conditions and the following disclaimer in the documentation
12 # and/or other materials provided with the distribution.
14 # Neither the name of ARM nor the names of its contributors may be used
15 # to endorse or promote products derived from this software without specific
16 # prior written permission.
18 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 # POSSIBILITY OF SUCH DAMAGE.
32 # Trusted Firmware Version
38 # Default values for build configurations
49 PLAT := ${DEFAULT_PLAT}
52 # Base commit to perform code check on
53 BASE_COMMIT := origin/master
54 # NS timer register save and restore
56 # By default, Bl1 acts as the reset handler, not BL31
58 # Include FP registers in cpu context
59 CTX_INCLUDE_FPREGS := 0
60 # Determine the version of ARM GIC architecture to use for interrupt management
61 # in EL3. The platform port can change this value if needed.
63 # Flag used to indicate if ASM_ASSERTION should be enabled for the build.
64 # This defaults to being present in DEBUG builds only.
65 ASM_ASSERTION := ${DEBUG}
66 # Build option to choose whether Trusted firmware uses Coherent memory or not.
68 # Default FIP file name
70 # By default, use the -pedantic option in the gcc command line
72 # Flags to generate the Chain of Trust
75 # Flags to build TF with Trusted Boot support
76 TRUSTED_BOARD_BOOT := 0
80 CHECK_IGNORE = --ignore COMPLEX_MACRO
82 CHECKPATCH_ARGS = --no-tree --no-signoff ${CHECK_IGNORE}
83 CHECKCODE_ARGS = --no-patch --no-tree --no-signoff ${CHECK_IGNORE}
87 CHECKCODE_ARGS += --no-summary --terse
95 # Use LOG_LEVEL_INFO by default for debug builds
99 # Use LOG_LEVEL_NOTICE by default for release builds
103 # Default build string (git branch and commit)
104 ifeq (${BUILD_STRING},)
105 BUILD_STRING := $(shell git log -n 1 --pretty=format:"%h")
108 VERSION_STRING := v${VERSION_MAJOR}.${VERSION_MINOR}(${BUILD_TYPE}):${BUILD_STRING}
110 BL_COMMON_SOURCES := common/bl_common.c \
112 common/aarch64/debug.S \
113 lib/aarch64/cache_helpers.S \
114 lib/aarch64/misc_helpers.S \
115 lib/aarch64/xlat_helpers.c \
117 plat/common/aarch64/platform_helpers.S
119 BUILD_BASE := ./build
120 BUILD_PLAT := ${BUILD_BASE}/${PLAT}/${BUILD_TYPE}
122 PLATFORMS := $(shell ls -I common plat/)
123 SPDS := $(shell ls -I none services/spd)
124 HELP_PLATFORMS := $(shell echo ${PLATFORMS} | sed 's/ /|/g')
126 # Convenience function for adding build definitions
127 # $(eval $(call add_define,FOO)) will have:
128 # -DFOO if $(FOO) is empty; -DFOO=$(FOO) otherwise
130 DEFINES += -D$(1)$(if $(value $(1)),=$(value $(1)),)
133 # Convenience function for verifying option has a boolean value
134 # $(eval $(call assert_boolean,FOO)) will assert FOO is 0 or 1
135 define assert_boolean
136 $(and $(patsubst 0,,$(value $(1))),$(patsubst 1,,$(value $(1))),$(error $(1) must be boolean))
140 $(error "Error: Unknown platform. Please use PLAT=<platform name> to specify the platform.")
142 ifeq ($(findstring ${PLAT},${PLATFORMS}),)
143 $(error "Error: Invalid platform. The following platforms are available: ${PLATFORMS}")
149 @echo "Building ${PLAT}"
151 include plat/${PLAT}/platform.mk
153 # Include the CPU specific operations makefile. By default all CPU errata
154 # workarounds and CPU specifc optimisations are disabled. This can be
155 # overridden by the platform.
156 include lib/cpus/cpu-ops.mk
166 # Using the ARM Trusted Firmware BL2 implies that a BL3-3 image also need to be supplied for the FIP.
167 # This flag can be overridden by the platform.
176 # Include SPD Makefile if one has been specified
178 # We expect to locate an spd.mk under the specified SPD directory
179 SPD_MAKE := $(shell m="services/spd/${SPD}/${SPD}.mk"; [ -f "$$m" ] && echo "$$m")
182 $(error Error: No services/spd/${SPD}/${SPD}.mk located)
184 $(info Including ${SPD_MAKE})
187 # If there's BL3-2 companion for the chosen SPD, and the SPD wants to build the
188 # BL3-2 from source, we expect that the SPD's Makefile would set NEED_BL32
189 # variable to "yes". In case the BL3-2 is a binary which needs to be included in
190 # fip, then the NEED_BL32 needs to be set and BL3-2 would need to point to the bin.
193 .PHONY: all msg_start clean realclean distclean cscope locate-checkpatch checkcodebase checkpatch fiptool fip certtool
196 INCLUDES += -Iinclude/bl31 \
197 -Iinclude/bl31/services \
200 -Iinclude/drivers/arm \
201 -Iinclude/drivers/io \
203 -Iinclude/lib/aarch64 \
204 -Iinclude/lib/cpus/aarch64 \
205 -Iinclude/plat/common \
207 -Iinclude/stdlib/sys \
212 $(eval $(call assert_boolean,DEBUG))
213 $(eval $(call add_define,DEBUG))
215 $(eval $(call add_define,NDEBUG))
218 ASFLAGS += -g -Wa,--gdwarf-2
221 # Process NS_TIMER_SWITCH flag
222 $(eval $(call assert_boolean,NS_TIMER_SWITCH))
223 $(eval $(call add_define,NS_TIMER_SWITCH))
225 # Process RESET_TO_BL31 flag
226 $(eval $(call assert_boolean,RESET_TO_BL31))
227 $(eval $(call add_define,RESET_TO_BL31))
229 # Process CTX_INCLUDE_FPREGS flag
230 $(eval $(call assert_boolean,CTX_INCLUDE_FPREGS))
231 $(eval $(call add_define,CTX_INCLUDE_FPREGS))
233 # Process ARM_GIC_ARCH flag
234 $(eval $(call add_define,ARM_GIC_ARCH))
236 # Process ASM_ASSERTION flag
237 $(eval $(call assert_boolean,ASM_ASSERTION))
238 $(eval $(call add_define,ASM_ASSERTION))
240 # Process LOG_LEVEL flag
241 $(eval $(call add_define,LOG_LEVEL))
243 # Process USE_COHERENT_MEM flag
244 $(eval $(call assert_boolean,USE_COHERENT_MEM))
245 $(eval $(call add_define,USE_COHERENT_MEM))
247 # Process Generate CoT flags
248 $(eval $(call assert_boolean,GENERATE_COT))
249 $(eval $(call assert_boolean,CREATE_KEYS))
251 # Process TRUSTED_BOARD_BOOT flag
252 $(eval $(call assert_boolean,TRUSTED_BOARD_BOOT))
253 $(eval $(call add_define,TRUSTED_BOARD_BOOT))
255 ASFLAGS += -nostdinc -ffreestanding -Wa,--fatal-warnings \
256 -Werror -Wmissing-include-dirs \
257 -mgeneral-regs-only -D__ASSEMBLY__ \
258 ${DEFINES} ${INCLUDES}
259 CFLAGS += -nostdinc -ffreestanding -Wall \
260 -Werror -Wmissing-include-dirs \
261 -mgeneral-regs-only -mstrict-align \
262 -std=c99 -c -Os ${DEFINES} ${INCLUDES} -fno-pic
263 CFLAGS += -ffunction-sections -fdata-sections \
264 -fno-delete-null-pointer-checks
266 LDFLAGS += --fatal-warnings -O1
267 LDFLAGS += --gc-sections
270 CC := ${CROSS_COMPILE}gcc
271 CPP := ${CROSS_COMPILE}cpp
272 AS := ${CROSS_COMPILE}gcc
273 AR := ${CROSS_COMPILE}ar
274 LD := ${CROSS_COMPILE}ld
275 OC := ${CROSS_COMPILE}objcopy
276 OD := ${CROSS_COMPILE}objdump
277 NM := ${CROSS_COMPILE}nm
278 PP := ${CROSS_COMPILE}gcc -E ${CFLAGS}
280 # Variables for use with Firmware Image Package
281 FIPTOOLPATH ?= tools/fip_create
282 FIPTOOL ?= ${FIPTOOLPATH}/fip_create
284 fip: ${BUILD_PLAT}/${FIP_NAME}
286 # Variables for use with Certificate Generation Tool
287 CRTTOOLPATH ?= tools/cert_create
288 CRTTOOL ?= ${CRTTOOLPATH}/cert_create
291 # CoT generation tool default parameters
292 TRUSTED_KEY_CERT := ${BUILD_PLAT}/trusted_key.crt
294 # Pass the private keys to the CoT generation tool in the command line
295 # If CREATE_KEYS is set, the '-n' option will be added, indicating the tool to create new keys
296 ifneq (${GENERATE_COT},0)
299 $(eval FIP_DEPS += certificates)
300 $(eval FIP_ARGS += --trusted-key-cert ${TRUSTED_KEY_CERT})
302 ifneq (${CREATE_KEYS},0)
303 $(eval CRT_ARGS += -n)
305 $(eval CRT_ARGS += $(if ${ROT_KEY}, --rot-key ${ROT_KEY}))
306 $(eval CRT_ARGS += $(if ${TRUSTED_WORLD_KEY}, --trusted-world-key ${TRUSTED_WORLD_KEY}))
307 $(eval CRT_ARGS += $(if ${NON_TRUSTED_WORLD_KEY}, --non-trusted-world-key ${NON_TRUSTED_WORLD_KEY}))
308 $(eval CRT_ARGS += --trusted-key-cert ${TRUSTED_KEY_CERT})
311 # Check Trusted Board Boot options
312 ifneq (${TRUSTED_BOARD_BOOT},0)
313 ifeq (${AUTH_MOD},none)
314 $(error Error: When TRUSTED_BOARD_BOOT=1, AUTH_MOD has to be the name of a valid authentication module)
316 # We expect to locate an *.mk file under the specified AUTH_MOD directory
317 AUTH_MAKE := $(shell m="common/auth/${AUTH_MOD}/${AUTH_MOD}.mk"; [ -f "$$m" ] && echo "$$m")
319 $(error Error: No common/auth/${AUTH_MOD}/${AUTH_MOD}.mk located)
321 $(info Including ${AUTH_MAKE})
325 BL_COMMON_SOURCES += common/auth.c
328 # Check if -pedantic option should be used
329 ifeq (${DISABLE_PEDANTIC},0)
335 $(error "Please set CHECKPATCH to point to the Linux checkpatch.pl file, eg: CHECKPATCH=../linux/script/checkpatch.pl")
337 ifeq (,$(wildcard ${CHECKPATCH}))
338 $(error "The file CHECKPATCH points to cannot be found, use eg: CHECKPATCH=../linux/script/checkpatch.pl")
344 ${Q}rm -rf ${BUILD_PLAT}
345 ${Q}${MAKE} --no-print-directory -C ${FIPTOOLPATH} clean
346 ${Q}${MAKE} PLAT=${PLAT} --no-print-directory -C ${CRTTOOLPATH} clean
350 ${Q}rm -rf ${BUILD_BASE}
351 ${Q}rm -f ${CURDIR}/cscope.*
352 ${Q}${MAKE} --no-print-directory -C ${FIPTOOLPATH} clean
353 ${Q}${MAKE} PLAT=${PLAT} --no-print-directory -C ${CRTTOOLPATH} clean
355 checkcodebase: locate-checkpatch
356 @echo " CHECKING STYLE"
357 @if test -d .git ; then \
358 git ls-files | grep -v stdlib | while read GIT_FILE ; do ${CHECKPATCH} ${CHECKCODE_ARGS} -f $$GIT_FILE ; done ; \
360 find . -type f -not -iwholename "*.git*" -not -iwholename "*build*" -not -iwholename "*stdlib*" -exec ${CHECKPATCH} ${CHECKCODE_ARGS} -f {} \; ; \
363 checkpatch: locate-checkpatch
364 @echo " CHECKING STYLE"
365 @git format-patch --stdout ${BASE_COMMIT} | ${CHECKPATCH} ${CHECKPATCH_ARGS} - || true
369 ${Q}${MAKE} PLAT=${PLAT} --no-print-directory -C ${CRTTOOLPATH}
371 @echo "Built $@ successfully"
376 ${Q}${MAKE} --no-print-directory -C ${FIPTOOLPATH}
379 $(strip $(foreach goal,$(1),$(filter $(goal),$(MAKECMDGOALS))))
382 # List of rules that involve building things
383 BUILD_TARGETS := all bl1 bl2 bl31 bl32 fip
385 # Does the list of goals specified on the command line include a build target?
386 ifneq ($(call match_goals,${BUILD_TARGETS}),)
387 IS_ANYTHING_TO_BUILD := 1
392 $(eval OBJ := $(1)/$(patsubst %.c,%.o,$(notdir $(2))))
393 $(eval PREREQUISITES := $(patsubst %.o,%.d,$(OBJ)))
397 $$(Q)$$(CC) $$(CFLAGS) -DIMAGE_BL$(3) -c $$< -o $$@
400 $(PREREQUISITES) : $(2)
403 $$(Q)$$(CC) $$(CFLAGS) -M -MT $(OBJ) -MF $$@ $$<
405 ifdef IS_ANYTHING_TO_BUILD
406 -include $(PREREQUISITES)
414 $(eval OBJ := $(1)/$(patsubst %.S,%.o,$(notdir $(2))))
415 $(eval PREREQUISITES := $(patsubst %.o,%.d,$(OBJ)))
419 $$(Q)$$(AS) $$(ASFLAGS) -DIMAGE_BL$(3) -c $$< -o $$@
421 $(PREREQUISITES) : $(2)
424 $$(Q)$$(AS) $$(ASFLAGS) -M -MT $(OBJ) -MF $$@ $$<
426 ifdef IS_ANYTHING_TO_BUILD
427 -include $(PREREQUISITES)
435 $(eval PREREQUISITES := $(1).d)
439 $$(Q)$$(AS) $$(ASFLAGS) -P -E -D__LINKER__ -o $$@ $$<
441 $(PREREQUISITES) : $(2)
443 @mkdir -p $$(dir $$@)
444 $$(Q)$$(AS) $$(ASFLAGS) -M -MT $(1) -MF $$@ $$<
446 ifdef IS_ANYTHING_TO_BUILD
447 -include $(PREREQUISITES)
454 $(eval C_OBJS := $(filter %.c,$(2)))
455 $(eval REMAIN := $(filter-out %.c,$(2)))
456 $(eval $(foreach obj,$(C_OBJS),$(call MAKE_C,$(1),$(obj),$(3))))
458 $(eval S_OBJS := $(filter %.S,$(REMAIN)))
459 $(eval REMAIN := $(filter-out %.S,$(REMAIN)))
460 $(eval $(foreach obj,$(S_OBJS),$(call MAKE_S,$(1),$(obj),$(3))))
462 $(and $(REMAIN),$(error Unexpected source files present: $(REMAIN)))
466 # NOTE: The line continuation '\' is required in the next define otherwise we
467 # end up with a line-feed characer at the end of the last c filename.
468 # Also bare this issue in mind if extending the list of supported filetypes.
469 define SOURCES_TO_OBJS
470 $(notdir $(patsubst %.c,%.o,$(filter %.c,$(1)))) \
471 $(notdir $(patsubst %.S,%.o,$(filter %.S,$(1))))
475 # MAKE_TOOL_ARGS macro defines the command line arguments for the FIP and CRT
476 # tools at each BL stage. Arguments:
477 # $(1) = BL stage (2, 30, 31, 32, 33)
479 # $(3) = In FIP (false if empty)
480 # $(4) = Create certificates (false if empty)
481 # $(5) = Create key certificate (false if empty)
482 # $(6) = Private key (optional)
483 define MAKE_TOOL_ARGS
485 $(eval FIP_DEPS += $(if $3,$(2),))
486 $(eval FIP_ARGS += $(if $3,--bl$(1) $(2),))
487 $(eval FIP_ARGS += $(if $4,--bl$(1)-cert $(BUILD_PLAT)/bl$(1).crt))
488 $(eval FIP_ARGS += $(if $4,$(if $5,--bl$(1)-key-cert $(BUILD_PLAT)/bl$(1)_key.crt)))
490 $(eval CRT_DEPS += $(if $4,$(2),))
491 $(eval CRT_DEPS += $(if $4,$(if $6,$(6),)))
492 $(eval CRT_ARGS += $(if $4,--bl$(1) $(2)))
493 $(eval CRT_ARGS += $(if $4,$(if $6,--bl$(1)-key $(6))))
494 $(eval CRT_ARGS += $(if $4,--bl$(1)-cert $(BUILD_PLAT)/bl$(1).crt))
495 $(eval CRT_ARGS += $(if $4,$(if $5,--bl$(1)-key-cert $(BUILD_PLAT)/bl$(1)_key.crt)))
500 # MAKE_BL macro defines the targets and options to build each BL image.
502 # $(1) = BL stage (2, 30, 31, 32, 33)
503 # $(2) = In FIP (false if empty)
504 # $(3) = Create certificates (false if empty)
505 # $(4) = Create key certificate (false if empty)
506 # $(5) = Private key (optional)
508 $(eval BUILD_DIR := ${BUILD_PLAT}/bl$(1))
509 $(eval SOURCES := $(BL$(1)_SOURCES) $(BL_COMMON_SOURCES) $(PLAT_BL_COMMON_SOURCES))
510 $(eval OBJS := $(addprefix $(BUILD_DIR)/,$(call SOURCES_TO_OBJS,$(SOURCES))))
511 $(eval LINKERFILE := $(BUILD_DIR)/bl$(1).ld)
512 $(eval MAPFILE := $(BUILD_DIR)/bl$(1).map)
513 $(eval ELF := $(BUILD_DIR)/bl$(1).elf)
514 $(eval DUMP := $(BUILD_DIR)/bl$(1).dump)
515 $(eval BIN := $(BUILD_PLAT)/bl$(1).bin)
517 $(eval $(call MAKE_OBJS,$(BUILD_DIR),$(SOURCES),$(1)))
518 $(eval $(call MAKE_LD,$(LINKERFILE),$(BL$(1)_LINKERFILE)))
523 $(ELF) : $(OBJS) $(LINKERFILE)
525 @echo 'const char build_message[] = "Built : "__TIME__", "__DATE__; \
526 const char version_string[] = "${VERSION_STRING}";' | \
527 $$(CC) $$(CFLAGS) -xc - -o $(BUILD_DIR)/build_message.o
528 $$(Q)$$(LD) -o $$@ $$(LDFLAGS) -Map=$(MAPFILE) --script $(LINKERFILE) \
529 $(BUILD_DIR)/build_message.o $(OBJS)
533 $${Q}$${OD} -dx $$< > $$@
537 $$(Q)$$(OC) -O binary $$< $$@
539 @echo "Built $$@ successfully"
543 bl$(1) : $(BUILD_DIR) $(BIN) $(DUMP)
547 $(eval $(call MAKE_TOOL_ARGS,$(1),$(BIN),$(2),$(3),$(4),$(5)))
552 ifeq (${NEED_BL1},yes)
553 $(eval $(call MAKE_BL,1))
556 ifeq (${NEED_BL2},yes)
557 $(if ${BL2}, $(eval $(call MAKE_TOOL_ARGS,2,${BL2},in_fip,${CERTS})),\
558 $(eval $(call MAKE_BL,2,in_fip,${CERTS})))
561 ifeq (${NEED_BL31},yes)
562 BL31_SOURCES += ${SPD_SOURCES}
563 $(if ${BL31}, $(eval $(call MAKE_TOOL_ARGS,31,${BL31},in_fip,${CERTS},${CERTS},${BL31_KEY})),\
564 $(eval $(call MAKE_BL,31,in_fip,${CERTS},${CERTS},${BL31_KEY})))
567 ifeq (${NEED_BL32},yes)
568 $(if ${BL32}, $(eval $(call MAKE_TOOL_ARGS,32,${BL32},in_fip,${CERTS},${CERTS},${BL32_KEY})),\
569 $(eval $(call MAKE_BL,32,in_fip,${CERTS},${CERTS},${BL32_KEY})))
572 ifeq (${NEED_BL30},yes)
573 $(if ${BL30}, $(eval $(call MAKE_TOOL_ARGS,30,${BL30},in_fip,${CERTS},${CERTS},${BL30_KEY})))
575 # If BL3-0 is needed by the platform then 'BL30' variable must be defined.
577 $(if ${BL30},,$(error "To build a FIP for platform ${PLAT}, please set BL30 to point to the SCP firmware"))
580 # If BL3-0 is not needed by the platform but the user still specified the path
581 # to a BL3-0 image then warn him that it will be ignored.
583 $(if ${BL30},$(warning "BL3-0 is not supported on platform ${PLAT}, it will just be ignored"),)
586 ifeq (${NEED_BL33},yes)
587 $(if ${BL33}, $(eval $(call MAKE_TOOL_ARGS,33,${BL33},in_fip,${CERTS},${CERTS},${BL33_KEY})))
589 # If BL3-3 is needed by the platform then 'BL33' variable must be defined.
591 $(if ${BL33},,$(error "To build a FIP, please set BL33 to point to the Normal World binary, eg: BL33=../uefi/FVP_AARCH64_EFI.fd"))
594 # If BL3-3 is not needed by the platform but the user still specified the path
595 # to a BL3-3 image then warn him that it will be ignored.
597 $(if ${BL33},$(warning "BL3-3 is not supported on platform ${PLAT}, it will just be ignored"),)
600 # Add the dependency on the certificates
601 ifneq (${GENERATE_COT},0)
605 certificates: ${CRT_DEPS} ${CRTTOOL} check_bl30 check_bl33
606 ${Q}${CRTTOOL} ${CRT_ARGS}
608 @echo "Built $@ successfully"
609 @echo "Certificates can be found in ${BUILD_PLAT}"
612 ${BUILD_PLAT}/${FIP_NAME}: ${FIP_DEPS} ${FIPTOOL} check_bl30 check_bl33
613 ${Q}${FIPTOOL} --dump \
617 @echo "Built $@ successfully"
623 ${Q}find ${CURDIR} -name "*.[chsS]" > cscope.files
627 @echo "usage: ${MAKE} PLAT=<${HELP_PLATFORMS}> <all|bl1|bl2|bl31|distclean|clean|checkcodebase|checkpatch>"
629 @echo "PLAT is used to specify which platform you wish to build."
630 @echo "If no platform is specified, PLAT defaults to: ${DEFAULT_PLAT}"
632 @echo "Supported Targets:"
633 @echo " all Build the BL1, BL2 and BL31 binaries"
634 @echo " bl1 Build the BL1 binary"
635 @echo " bl2 Build the BL2 binary"
636 @echo " bl31 Build the BL31 binary"
637 @echo " checkcodebase Check the coding style of the entire source tree"
638 @echo " checkpatch Check the coding style on changes in the current"
639 @echo " branch against BASE_COMMIT (default origin/master)"
640 @echo " clean Clean the build for the selected platform"
641 @echo " cscope Generate cscope index"
642 @echo " distclean Remove all build artifacts for all platforms"
643 @echo " certtool Build the Certificate generation tool"
644 @echo " fiptool Build the Firmware Image Package(FIP) creation tool"
646 @echo "note: most build targets require PLAT to be set to a specific platform."
648 @echo "example: build all targets for the FVP platform:"
649 @echo " CROSS_COMPILE=aarch64-none-elf- make PLAT=fvp all"