bitbake u-boot-imx failed because undefined reference to __aeabi_d2iz

[TKayO]

Hello, 

I added some code in my $UBOOT/board/freescale/mx6sabresd.c.

which is some calculation of double precision variables.

then when I build my u-boot-imx with "bitbake u-boot-imx"

following errors occurs.

/MY-ROOT/uboot/board/freescale/mx6sabresd/mx6sabresd.c:2135: undefined reference to `__aeabi_d2iz'
arm-poky-linux-gnueabi-ld.bfd: /MY-ROOT/uboot/board/freescale/mx6sabresd/mx6sabresd.c:2135: undefined reference to `__aeabi_d2iz'
arm-poky-linux-gnueabi-ld.bfd: /MY-ROOT/uboot/board/freescale/mx6sabresd/mx6sabresd.c:2137: undefined reference to `__aeabi_dcmplt'
arm-poky-linux-gnueabi-ld.bfd: /MY-ROOT/uboot/board/freescale/mx6sabresd/mx6sabresd.c:2149: undefined reference to `__aeabi_dcmpgt'
arm-poky-linux-gnueabi-ld.bfd: /MY-ROOT/uboot/board/freescale/mx6sabresd/mx6sabresd.c:2143: undefined reference to `__aeabi_dcmplt'
arm-poky-linux-gnueabi-ld.bfd: /MY-ROOT/uboot/board/freescale/mx6sabresd/mx6sabresd.c:2149: undefined reference to `__aeabi_dcmpgt'
arm-poky-linux-gnueabi-ld.bfd: /MY-ROOT/uboot/board/freescale/mx6sabresd/mx6sabresd.c:2149: undefined reference to `__aeabi_dcmpgt'
make: *** [Makefile:1704: u-boot] Error 1

the double precision calculation codes are copied from my earlier project in u-boot.2009.

and there was no problem with 2009 version.

Please help with any suggestions. 

Thank you!!

[TKayO · Accepted solution]

Here's solution..

in arch/arm/config.mk

# added the bold text part

PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections \

             -fno-common -ffixed-r9 \

             -mfpu=neon -mfloat-abi=hard

# and removed the bold text part

PLATFORM_RELFLAGS += $(call cc-option, -msoft-float) \

      $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,))

in my defconfig

added below

# CONFIG_USE_PRIVATE_LIBGCC is not set

this option effects the Makefile 

# Add GCC lib

ifeq ($(CONFIG_USE_PRIVATE_LIBGCC),y)

PLATFORM_LIBGCC = arch/$(ARCH)/lib/lib.a

else

PLATFORM_LIBGCC := -L $(shell dirname `$(CC) $(c_flags) -print-libgcc-file-name`) -lgcc

endif

PLATFORM_LIBS += $(PLATFORM_LIBGCC)

Regards

[TKayO]

modified defconfig with

"# CONFIG_USE_PRIVATE_LIBGCC is not set"

then 

arm-poky-linux-gnueabi-ld.bfd: error: /home/brant/work/imx/bld-imx6dlsabresd-xwayland-full/_local/tool/sysroots/cortexa9t2hf-neon-poky-linux-gnueabi/usr/lib/arm-poky-linux-gnueabi/10.2.0/libgcc.a(_udivmoddi4.o) uses VFP register arguments, u-boot does not
arm-poky-linux-gnueabi-ld.bfd: warning: /home/brant/work/imx/bld-imx6dlsabresd-xwayland-full/_local/tool/sysroots/cortexa9t2hf-neon-poky-linux-gnueabi/usr/lib/arm-poky-linux-gnueabi/10.2.0/libgcc.a(_udivmoddi4.o) uses 4-byte wchar_t yet the output is to use 2-byte wchar_t; use of wchar_t values across objects may fail
arm-poky-linux-gnueabi-ld.bfd: failed to merge target specific data of file /home/brant/work/imx/bld-imx6dlsabresd-xwayland-full/_local/tool/sysroots/cortexa9t2hf-neon-poky-linux-gnueabi/usr/lib/arm-poky-linux-gnueabi/10.2.0/libgcc.a(_udivmoddi4.o)
make: *** [Makefile:1704: u-boot] Error 1

[TKayO]

added "-mfpu=vfpv3 -mfloat-abi=hard"

to PLATFORM_RELFLAGS in config.mk

and now I have a warning.. 

"arm-poky-linux-gnueabi-ld.bfd: warning: /home/brant/work/imx/bld-imx6dlsabresd-xwayland-full/_local/tool/sysroots/cortexa9t2hf-neon-poky-linux-gnueabi/usr/lib/arm-poky-linux-gnueabi/10.2.0/libgcc.a(_udivmoddi4.o) uses 4-byte wchar_t yet the output is to use 2-byte wchar_t; use of wchar_t values across objects may fail"

[TKayO]

https://community.nxp.com/t5/i-MX-Processors/how-to-use-float-operation-in-uboot-codes/m-p/1071182

this topic says no floating point supported in u-boot. 

also double precision?

[Bio_TICFSL]

Hello Brant8484,

__aeabi_d2iz lives in libgcc.a. libgcc.a must be linked *AFTER* libm.a.

Adding "gcc" to the Linker | Libraries | Libraries pane after "m" fixed the problem.

We had a -lgcc in the Miscellaneous Linker Flags pane, which apparently caused libgcc.a to be linked BEFORE libm.a.

However please try the latest uboot is fully tested and works ok.

Regards

[TKayO]

Hello, 

Thank you for your reply.

I'm working with u-boot version lf_v2020.04.

I added my Makefile (board/freescale/mx6sabresd/Makefile) like below,

LDFLAGS_mc6sabresd.o := -lgcc

obj-y  := mx6sabresd.o 

and there's no differences.

@Bio_TICFSL Can you help me with exact file name and modification point?

Regards.