Hello,
If I build U-Boot natively on an A20-Olinuxino-Micro (sunxi) running Debian Jessie armhf, and the code includes certain operations such as division of a long long, I get this error:
$ make [...] LDS u-boot.lds LD u-boot ld.bfd: error: /usr/lib/gcc/arm-linux-gnueabihf/4.9/libgcc.a(bpabi.o) uses VFP register arguments, u-boot does not ld.bfd: failed to merge target specific data of file /usr/lib/gcc/arm-linux-gnueabihf/4.9/libgcc.a(bpabi.o) ld.bfd: error: /usr/lib/gcc/arm-linux-gnueabihf/4.9/libgcc.a(_divdi3.o) uses VFP register arguments, u-boot does not ld.bfd: failed to merge target specific data of file /usr/lib/gcc/arm-linux-gnueabihf/4.9/libgcc.a(_divdi3.o) ld.bfd: error: /usr/lib/gcc/arm-linux-gnueabihf/4.9/libgcc.a(_udivdi3.o) uses VFP register arguments, u-boot does not ld.bfd: failed to merge target specific data of file /usr/lib/gcc/arm-linux-gnueabihf/4.9/libgcc.a(_udivdi3.o) Makefile:1075: recipe for target 'u-boot' failed make: *** [u-boot] Error 1 $
I think this is because U-Boot has been built with the soft-float ABI, whereas my system only has a hard-float library. The relevant build option is set in arch/arm/config.mk:
PLATFORM_RELFLAGS += $(call cc-option, -msoft-float) \ $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,))
The build works once I've removed the -msoft-float option.
Would it be possible to refactor the configuration under arch/arm/ so that this option is not set for the platforms that don't need it?
There was a brief discussion of this issue on the linux-sunxi mailing list suggesting it may have worked better in the past:
On 28/12/14 16:15, Chen-Yu Tsai wrote:
It seems some recent changes in upstream broke building with hard float toolchains. Best use soft float.
It's probably these commits:
bf1af3d ARM: merge commonly-defined PLATFORM_RELFLAGS 3102274 ARM: refactor compiler options in config.mk
( https://www.mail-archive.com/linux-sunxi@googlegroups.com/msg09271.html )
Thanks very much, B.R. Oake.