[U-Boot] [PATCH] MIPS: fix endianess handling
Make endianess of target CPU configurable. Use the new config option for dbau1550_el and pb1000 boards.
Adapt linking of standalone applications to pass through endianess options to LD.
Build tested with: - ELDK 4 mips_4KC- and mips4KCle - Sourcery CodeBench Lite 2011.03-93
Signed-off-by: Daniel Schwierzeck daniel.schwierzeck@googlemail.com Cc: Thomas Lange thomas@corelatus.se Cc: Mike Frysinger vapier@gentoo.org Cc: Wolfgang Denk wd@denx.de --- Another try to finally fix this originated by discussion: [1] http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/118111/focus=118122
Related discussions: [2] http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/81572 [3] http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/45404
README | 6 ++++++ arch/mips/cpu/mips32/config.mk | 21 +++++++++++++++------ boards.cfg | 4 ++-- examples/standalone/Makefile | 6 +++++- 4 files changed, 28 insertions(+), 9 deletions(-)
diff --git a/README b/README index 07f1d11..468bfdf 100644 --- a/README +++ b/README @@ -374,6 +374,12 @@ The following options need to be configured: Defines the string to utilize when trying to match PCIe device tree nodes for the given platform.
+- Generic CPU options: + CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN + + Defines the endianess of the CPU. Implementation of those + values is arch specific. + - Intel Monahans options: CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
diff --git a/arch/mips/cpu/mips32/config.mk b/arch/mips/cpu/mips32/config.mk index 4d1b273..a1cd590 100644 --- a/arch/mips/cpu/mips32/config.mk +++ b/arch/mips/cpu/mips32/config.mk @@ -27,14 +27,23 @@ # Note: Toolchains with binutils prior to v2.16 # are no longer supported by U-Boot MIPS tree! # -MIPSFLAGS = -march=mips32r2 +MIPSFLAGS := -march=mips32r2
+# Handle special prefix in ELDK 4.0 toolchain ifneq (,$(findstring 4KCle,$(CROSS_COMPILE))) -ENDIANNESS = -EL -else -ENDIANNESS = -EB +ENDIANNESS := -EL endif
-MIPSFLAGS += $(ENDIANNESS) +ifdef CONFIG_SYS_LITTLE_ENDIAN +ENDIANNESS := -EL +endif + +ifdef CONFIG_SYS_BIG_ENDIAN +ENDIANNESS := -EB +endif + +# Default to EB if no endianess is configured +ENDIANNESS ?= -EB
-PLATFORM_CPPFLAGS += $(MIPSFLAGS) +PLATFORM_CPPFLAGS += $(MIPSFLAGS) $(ENDIANNESS) +PLATFORM_LDFLAGS += $(ENDIANNESS) diff --git a/boards.cfg b/boards.cfg index c83d861..2cd917e 100644 --- a/boards.cfg +++ b/boards.cfg @@ -324,13 +324,13 @@ dbau1000 mips mips32 dbau1x00 - dbau1100 mips mips32 dbau1x00 - au1x00 dbau1x00:DBAU1100 dbau1500 mips mips32 dbau1x00 - au1x00 dbau1x00:DBAU1500 dbau1550 mips mips32 dbau1x00 - au1x00 dbau1x00:DBAU1550 -dbau1550_el mips mips32 dbau1x00 - au1x00 dbau1x00:DBAU1550 +dbau1550_el mips mips32 dbau1x00 - au1x00 dbau1x00:DBAU1550,SYS_LITTLE_ENDIAN gth2 mips mips32 - - au1x00 incaip mips mips32 incaip - incaip incaip_100MHz mips mips32 incaip - incaip incaip:CPU_CLOCK_RATE=100000000 incaip_133MHz mips mips32 incaip - incaip incaip:CPU_CLOCK_RATE=133000000 incaip_150MHz mips mips32 incaip - incaip incaip:CPU_CLOCK_RATE=150000000 -pb1000 mips mips32 pb1x00 - au1x00 pb1x00:PB1000 +pb1000 mips mips32 pb1x00 - au1x00 pb1x00:PB1000,SYS_LITTLE_ENDIAN qemu_mips mips mips32 qemu-mips - - qemu-mips tb0229 mips mips32 vct_premium mips mips32 vct micronas - vct:VCT_PREMIUM diff --git a/examples/standalone/Makefile b/examples/standalone/Makefile index e23865b..eab23b4 100644 --- a/examples/standalone/Makefile +++ b/examples/standalone/Makefile @@ -88,6 +88,10 @@ endif CFLAGS_NTR := $(call cc-option,-fno-toplevel-reorder) CFLAGS += $(CFLAGS_NTR)
+# Pass through endianess settings in LDFLAGS to LD +LDFLAGS_ENDIAN += $(filter -EB,$(LDFLAGS)) +LDFLAGS_ENDIAN += $(filter -EL,$(LDFLAGS)) + all: $(obj).depend $(OBJS) $(LIB) $(SREC) $(BIN) $(ELF)
######################################################################### @@ -96,7 +100,7 @@ $(LIB): $(obj).depend $(LIBOBJS)
$(ELF): $(obj)%: $(obj)%.o $(LIB) - $(LD) -g -Ttext $(CONFIG_STANDALONE_LOAD_ADDR) \ + $(LD) $(LDFLAGS_ENDIAN) -g -Ttext $(CONFIG_STANDALONE_LOAD_ADDR) \ -o $@ -e $(SYM_PREFIX)$(notdir $(<:.o=)) $< $(LIB) \ -L$(gcclibdir) -lgcc
Make endianess of target CPU configurable. Use the new config option for dbau1550_el and pb1000 boards.
Adapt linking of standalone applications to pass through endianess options to LD.
Build tested with: - ELDK 4 mips_4KC- and mips4KCle - Sourcery CodeBench Lite 2011.03-93
With this patch all 26 MIPS boards can be compiled now in one step by running "MAKEALL -a mips".
Signed-off-by: Daniel Schwierzeck daniel.schwierzeck@googlemail.com --- Changes for v2: - moved CONFIG_SYS_LITTLE_ENDIAN from boards.cfg to configs/pb1x00.h - fixed typo in comment - updated patch summary
Note: qemu_mips and tb0229 boards are still broken.
Build result with Sourcery CodeBench Lite 2011.03-93:
~/devel/u-boot$ CROSS_COMPILE=/opt/codesourcery/mips-2011.03/bin/mips-linux-gnu- BUILD_NCPUS=2 ./MAKEALL -a mips Configuring for dbau1000 - Board: dbau1x00, Options: DBAU1000 text data bss dec hex filename 120604 4390 16068 141062 22706 ./u-boot Configuring for dbau1100 - Board: dbau1x00, Options: DBAU1100 text data bss dec hex filename 120604 4390 16068 141062 22706 ./u-boot Configuring for dbau1500 - Board: dbau1x00, Options: DBAU1500 text data bss dec hex filename 120604 4390 16068 141062 22706 ./u-boot Configuring for dbau1550 - Board: dbau1x00, Options: DBAU1550 text data bss dec hex filename 119148 4454 18732 142334 22bfe ./u-boot Configuring for dbau1550_el - Board: dbau1x00, Options: DBAU1550,SYS_LITTLE_ENDIAN text data bss dec hex filename 120316 4454 18732 143502 2308e ./u-boot Configuring for gth2 board... text data bss dec hex filename 113668 4390 13752 131810 202e2 ./u-boot Configuring for incaip board... text data bss dec hex filename 147500 5066 15676 168242 29132 ./u-boot Configuring for incaip_100MHz - Board: incaip, Options: CPU_CLOCK_RATE=100000000 text data bss dec hex filename 147500 5066 15676 168242 29132 ./u-boot Configuring for incaip_133MHz - Board: incaip, Options: CPU_CLOCK_RATE=133000000 text data bss dec hex filename 147500 5066 15676 168242 29132 ./u-boot Configuring for incaip_150MHz - Board: incaip, Options: CPU_CLOCK_RATE=150000000 text data bss dec hex filename 147500 5066 15676 168242 29132 ./u-boot Configuring for pb1000 - Board: pb1x00, Options: PB1000 text data bss dec hex filename 110084 5090 15896 131070 1fffe ./u-boot Configuring for qemu_mips board... net/libnet.o: In function `eth_halt': (.text.eth_halt+0x0): multiple definition of `eth_halt' drivers/net/libnet.o:/home/schwierd/devel/u-boot/drivers/net/ne2000_base.c:721: first defined here net/libnet.o: In function `eth_rx': (.text.eth_rx+0x0): multiple definition of `eth_rx' drivers/net/libnet.o:/home/schwierd/devel/u-boot/drivers/net/ne2000_base.c:729: first defined here net/libnet.o: In function `eth_init': (.text.eth_init+0x0): multiple definition of `eth_init' drivers/net/libnet.o:/home/schwierd/devel/u-boot/drivers/net/ne2000_base.c:668: first defined here net/libnet.o: In function `eth_send': (.text.eth_send+0x0): multiple definition of `eth_send' drivers/net/libnet.o:/home/schwierd/devel/u-boot/drivers/net/ne2000_base.c:734: first defined here make: *** [u-boot] Error 1 /opt/codesourcery/mips-2011.03/bin/mips-linux-gnu-size: './u-boot': No such file Configuring for tb0229 board... flash.c:27:24: fatal error: asm/ppc4xx.h: No such file or directory compilation terminated. make[1]: *** No rule to make target `.depend', needed by `_depend'. Stop. make: *** [depend] Error 2 /opt/codesourcery/mips-2011.03/bin/mips-linux-gnu-size: './u-boot': No such file Configuring for vct_premium - Board: vct, Options: VCT_PREMIUM text data bss dec hex filename 197880 12100 272852 482832 75e10 ./u-boot Configuring for vct_premium_small - Board: vct, Options: VCT_PREMIUM,VCT_SMALL_IMAGE board.c: In function 'board_init_r': board.c:266:8: warning: unused variable 's' text data bss dec hex filename 88104 3640 14372 106116 19e84 ./u-boot Configuring for vct_premium_onenand - Board: vct, Options: VCT_PREMIUM,VCT_ONENAND text data bss dec hex filename 292552 14564 274068 581184 8de40 ./u-boot Configuring for vct_premium_onenand_small - Board: vct, Options: VCT_PREMIUM,VCT_ONENAND,VCT_SMALL_IMAGE board.c: In function 'board_init_r': board.c:266:8: warning: unused variable 's' text data bss dec hex filename 181884 6056 15604 203544 31b18 ./u-boot Configuring for vct_platinum - Board: vct, Options: VCT_PLATINUM text data bss dec hex filename 197880 12100 272852 482832 75e10 ./u-boot Configuring for vct_platinum_small - Board: vct, Options: VCT_PLATINUM,VCT_SMALL_IMAGE board.c: In function 'board_init_r': board.c:266:8: warning: unused variable 's' text data bss dec hex filename 88104 3640 14372 106116 19e84 ./u-boot Configuring for vct_platinum_onenand - Board: vct, Options: VCT_PLATINUM,VCT_ONENAND text data bss dec hex filename 292552 14564 274068 581184 8de40 ./u-boot Configuring for vct_platinum_onenand_small - Board: vct, Options: VCT_PLATINUM,VCT_ONENAND,VCT_SMALL_IMAGE board.c: In function 'board_init_r': board.c:266:8: warning: unused variable 's' text data bss dec hex filename 181884 6056 15604 203544 31b18 ./u-boot Configuring for vct_platinumavc - Board: vct, Options: VCT_PLATINUMAVC board.c: In function 'board_init_r': board.c:266:8: warning: unused variable 's' text data bss dec hex filename 118196 4752 15576 138524 21d1c ./u-boot Configuring for vct_platinumavc_small - Board: vct, Options: VCT_PLATINUMAVC,VCT_SMALL_IMAGE board.c: In function 'board_init_r': board.c:266:8: warning: unused variable 's' text data bss dec hex filename 87608 3640 14372 105620 19c94 ./u-boot Configuring for vct_platinumavc_onenand - Board: vct, Options: VCT_PLATINUMAVC,VCT_ONENAND board.c: In function 'board_init_r': board.c:266:8: warning: unused variable 's' text data bss dec hex filename 213024 7212 16820 237056 39e00 ./u-boot Configuring for vct_platinumavc_onenand_small - Board: vct, Options: VCT_PLATINUMAVC,VCT_ONENAND,VCT_SMALL_IMAGE board.c: In function 'board_init_r': board.c:266:8: warning: unused variable 's' text data bss dec hex filename 181380 6056 15604 203040 31920 ./u-boot Configuring for qi_lb60 board... cpu.c: In function '_machine_restart': cpu.c:65:2: warning: dereferencing type-punned pointer will break strict-aliasing rules cpu.c:65:2: warning: large integer implicitly truncated to unsigned type board.c: In function 'board_init_r': board.c:266:8: warning: unused variable 's' timer.c: In function 'reset_timer_masked': timer.c:37:2: warning: dereferencing type-punned pointer will break strict-aliasing rules timer.c: In function 'get_timer_masked': timer.c:43:2: warning: dereferencing type-punned pointer will break strict-aliasing rules timer.c: In function 'timer_init': timer.c:86:2: warning: dereferencing type-punned pointer will break strict-aliasing rules timer.c:88:2: warning: dereferencing type-punned pointer will break strict-aliasing rules timer.c:89:2: warning: dereferencing type-punned pointer will break strict-aliasing rules timer.c:90:2: warning: dereferencing type-punned pointer will break strict-aliasing rules qi_lb60.c: In function 'cpm_init': qi_lb60.c:72:2: warning: dereferencing type-punned pointer will break strict-aliasing rules qi_lb60.c:84:2: warning: dereferencing type-punned pointer will break strict-aliasing rules text data bss dec hex filename 123064 8304 2528 133896 20b08 ./u-boot
--------------------- SUMMARY ---------------------------- Boards compiled: 26 Boards with warnings or errors: 11 ( qemu_mips tb0229 vct_premium_small vct_premium_onenand_small vct_platinum_small vct_platinum_onenand_small vct_platinumavc vct_platinumavc_small vct_platinumavc_onenand vct_platinumavc_onenand_small qi_lb60 ) ----------------------------------------------------------
README | 6 ++++++ arch/mips/cpu/mips32/config.mk | 21 +++++++++++++++------ boards.cfg | 2 +- examples/standalone/Makefile | 6 +++++- include/configs/pb1x00.h | 2 ++ 5 files changed, 29 insertions(+), 8 deletions(-)
diff --git a/README b/README index 3ddec77..0e09842 100644 --- a/README +++ b/README @@ -374,6 +374,12 @@ The following options need to be configured: Defines the string to utilize when trying to match PCIe device tree nodes for the given platform.
+- Generic CPU options: + CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN + + Defines the endianess of the CPU. Implementation of those + values is arch specific. + - Intel Monahans options: CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
diff --git a/arch/mips/cpu/mips32/config.mk b/arch/mips/cpu/mips32/config.mk index 4d1b273..a1cd590 100644 --- a/arch/mips/cpu/mips32/config.mk +++ b/arch/mips/cpu/mips32/config.mk @@ -27,14 +27,23 @@ # Note: Toolchains with binutils prior to v2.16 # are no longer supported by U-Boot MIPS tree! # -MIPSFLAGS = -march=mips32r2 +MIPSFLAGS := -march=mips32r2
+# Handle special prefix in ELDK 4.0 toolchain ifneq (,$(findstring 4KCle,$(CROSS_COMPILE))) -ENDIANNESS = -EL -else -ENDIANNESS = -EB +ENDIANNESS := -EL endif
-MIPSFLAGS += $(ENDIANNESS) +ifdef CONFIG_SYS_LITTLE_ENDIAN +ENDIANNESS := -EL +endif + +ifdef CONFIG_SYS_BIG_ENDIAN +ENDIANNESS := -EB +endif + +# Default to EB if no endianess is configured +ENDIANNESS ?= -EB
-PLATFORM_CPPFLAGS += $(MIPSFLAGS) +PLATFORM_CPPFLAGS += $(MIPSFLAGS) $(ENDIANNESS) +PLATFORM_LDFLAGS += $(ENDIANNESS) diff --git a/boards.cfg b/boards.cfg index b678547..e99fde6 100644 --- a/boards.cfg +++ b/boards.cfg @@ -323,7 +323,7 @@ dbau1000 mips mips32 dbau1x00 - dbau1100 mips mips32 dbau1x00 - au1x00 dbau1x00:DBAU1100 dbau1500 mips mips32 dbau1x00 - au1x00 dbau1x00:DBAU1500 dbau1550 mips mips32 dbau1x00 - au1x00 dbau1x00:DBAU1550 -dbau1550_el mips mips32 dbau1x00 - au1x00 dbau1x00:DBAU1550 +dbau1550_el mips mips32 dbau1x00 - au1x00 dbau1x00:DBAU1550,SYS_LITTLE_ENDIAN gth2 mips mips32 - - au1x00 incaip mips mips32 incaip - incaip incaip_100MHz mips mips32 incaip - incaip incaip:CPU_CLOCK_RATE=100000000 diff --git a/examples/standalone/Makefile b/examples/standalone/Makefile index e23865b..8c9e4cf 100644 --- a/examples/standalone/Makefile +++ b/examples/standalone/Makefile @@ -88,6 +88,10 @@ endif CFLAGS_NTR := $(call cc-option,-fno-toplevel-reorder) CFLAGS += $(CFLAGS_NTR)
+# Pass through endianness settings in LDFLAGS to LD +LDFLAGS_ENDIAN += $(filter -EB,$(LDFLAGS)) +LDFLAGS_ENDIAN += $(filter -EL,$(LDFLAGS)) + all: $(obj).depend $(OBJS) $(LIB) $(SREC) $(BIN) $(ELF)
######################################################################### @@ -96,7 +100,7 @@ $(LIB): $(obj).depend $(LIBOBJS)
$(ELF): $(obj)%: $(obj)%.o $(LIB) - $(LD) -g -Ttext $(CONFIG_STANDALONE_LOAD_ADDR) \ + $(LD) $(LDFLAGS_ENDIAN) -g -Ttext $(CONFIG_STANDALONE_LOAD_ADDR) \ -o $@ -e $(SYM_PREFIX)$(notdir $(<:.o=)) $< $(LIB) \ -L$(gcclibdir) -lgcc
diff --git a/include/configs/pb1x00.h b/include/configs/pb1x00.h index eea8ed3..d056884 100644 --- a/include/configs/pb1x00.h +++ b/include/configs/pb1x00.h @@ -46,6 +46,8 @@ #endif #endif
+#define CONFIG_SYS_LITTLE_ENDIAN + #define CONFIG_ETHADDR DE:AD:BE:EF:01:01 /* Ethernet address */
#define CONFIG_BOOTDELAY 2 /* autoboot after 2 seconds */
Make endianess of target CPU configurable. Use the new config option for dbau1550_el and pb1000 boards.
Adapt linking of standalone applications to pass through endianess options to LD.
Build tested with: - ELDK 4 mips_4KC- and mips4KCle - Sourcery CodeBench Lite 2011.03-93
With this patch all 26 MIPS boards can be compiled now in one step by running "MAKEALL -a mips".
Signed-off-by: Daniel Schwierzeck daniel.schwierzeck@googlemail.com --- Changes for v3: - rebased against current master
Changes for v2: - moved CONFIG_SYS_LITTLE_ENDIAN from boards.cfg to configs/pb1x00.h - fixed typo in comment - updated patch summary
README | 6 ++++++ arch/mips/cpu/mips32/config.mk | 21 +++++++++++++++------ boards.cfg | 2 +- examples/standalone/Makefile | 6 +++++- include/configs/pb1x00.h | 2 ++ 5 files changed, 29 insertions(+), 8 deletions(-)
diff --git a/README b/README index ff72e47..afcfc8f 100644 --- a/README +++ b/README @@ -374,6 +374,12 @@ The following options need to be configured: Defines the string to utilize when trying to match PCIe device tree nodes for the given platform.
+- Generic CPU options: + CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN + + Defines the endianess of the CPU. Implementation of those + values is arch specific. + - Intel Monahans options: CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
diff --git a/arch/mips/cpu/mips32/config.mk b/arch/mips/cpu/mips32/config.mk index 4d1b273..a1cd590 100644 --- a/arch/mips/cpu/mips32/config.mk +++ b/arch/mips/cpu/mips32/config.mk @@ -27,14 +27,23 @@ # Note: Toolchains with binutils prior to v2.16 # are no longer supported by U-Boot MIPS tree! # -MIPSFLAGS = -march=mips32r2 +MIPSFLAGS := -march=mips32r2
+# Handle special prefix in ELDK 4.0 toolchain ifneq (,$(findstring 4KCle,$(CROSS_COMPILE))) -ENDIANNESS = -EL -else -ENDIANNESS = -EB +ENDIANNESS := -EL endif
-MIPSFLAGS += $(ENDIANNESS) +ifdef CONFIG_SYS_LITTLE_ENDIAN +ENDIANNESS := -EL +endif + +ifdef CONFIG_SYS_BIG_ENDIAN +ENDIANNESS := -EB +endif + +# Default to EB if no endianess is configured +ENDIANNESS ?= -EB
-PLATFORM_CPPFLAGS += $(MIPSFLAGS) +PLATFORM_CPPFLAGS += $(MIPSFLAGS) $(ENDIANNESS) +PLATFORM_LDFLAGS += $(ENDIANNESS) diff --git a/boards.cfg b/boards.cfg index a0a2bba..cbeba0c 100644 --- a/boards.cfg +++ b/boards.cfg @@ -348,7 +348,7 @@ dbau1000 mips mips32 dbau1x00 - dbau1100 mips mips32 dbau1x00 - au1x00 dbau1x00:DBAU1100 dbau1500 mips mips32 dbau1x00 - au1x00 dbau1x00:DBAU1500 dbau1550 mips mips32 dbau1x00 - au1x00 dbau1x00:DBAU1550 -dbau1550_el mips mips32 dbau1x00 - au1x00 dbau1x00:DBAU1550 +dbau1550_el mips mips32 dbau1x00 - au1x00 dbau1x00:DBAU1550,SYS_LITTLE_ENDIAN gth2 mips mips32 - - au1x00 pb1000 mips mips32 pb1x00 - au1x00 pb1x00:PB1000 incaip mips mips32 incaip - incaip diff --git a/examples/standalone/Makefile b/examples/standalone/Makefile index e23865b..8c9e4cf 100644 --- a/examples/standalone/Makefile +++ b/examples/standalone/Makefile @@ -88,6 +88,10 @@ endif CFLAGS_NTR := $(call cc-option,-fno-toplevel-reorder) CFLAGS += $(CFLAGS_NTR)
+# Pass through endianness settings in LDFLAGS to LD +LDFLAGS_ENDIAN += $(filter -EB,$(LDFLAGS)) +LDFLAGS_ENDIAN += $(filter -EL,$(LDFLAGS)) + all: $(obj).depend $(OBJS) $(LIB) $(SREC) $(BIN) $(ELF)
######################################################################### @@ -96,7 +100,7 @@ $(LIB): $(obj).depend $(LIBOBJS)
$(ELF): $(obj)%: $(obj)%.o $(LIB) - $(LD) -g -Ttext $(CONFIG_STANDALONE_LOAD_ADDR) \ + $(LD) $(LDFLAGS_ENDIAN) -g -Ttext $(CONFIG_STANDALONE_LOAD_ADDR) \ -o $@ -e $(SYM_PREFIX)$(notdir $(<:.o=)) $< $(LIB) \ -L$(gcclibdir) -lgcc
diff --git a/include/configs/pb1x00.h b/include/configs/pb1x00.h index eea8ed3..d056884 100644 --- a/include/configs/pb1x00.h +++ b/include/configs/pb1x00.h @@ -46,6 +46,8 @@ #endif #endif
+#define CONFIG_SYS_LITTLE_ENDIAN + #define CONFIG_ETHADDR DE:AD:BE:EF:01:01 /* Ethernet address */
#define CONFIG_BOOTDELAY 2 /* autoboot after 2 seconds */
On Sunday 11 December 2011 11:53:11 Daniel Schwierzeck wrote:
--- a/README +++ b/README @@ -374,6 +374,12 @@ The following options need to be configured: Defines the string to utilize when trying to match PCIe device tree nodes for the given platform.
+- Generic CPU options:
CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIANDefines the endianess of the CPU. Implementation of thosevalues is arch specific.
might be useful to describe what these do. something like: Adds options to explicitly add compiler flags that select the desired endianness. Otherwise, the endian will be whatever the toolchain defaults to.
--- a/arch/mips/cpu/mips32/config.mk +++ b/arch/mips/cpu/mips32/config.mk
+ifdef CONFIG_SYS_LITTLE_ENDIAN +ENDIANNESS := -EL +endif
+ifdef CONFIG_SYS_BIG_ENDIAN +ENDIANNESS := -EB +endif
the GNU linker should treat -EL/-EB the same for all targets. so we should be able to add to the common .mk files in the top level: LDFLAGS-$(CONFIG_SYS_LITTLE_ENDIAN) += -EL LDFLAGS-$(CONFIG_SYS_BIG_ENDIAN) += -EB -mike
participants (2)
-
Daniel Schwierzeck -
Mike Frysinger