Hi, I'm working on RTEMS 5.0 BSP for a new SOC based on ARM926EJS which has a VFP9-S Floating point coprocessor inside. I was able to successfully boot RTEMS and run hello.exe and ticker.exe testsuite samples using u-boot.
I have enabled VFP from Uboot using the coprocessor instructions given in ARM926EJS RM. In order to use the VFP coprocessor in RTEMS I have added *CPU_CFLAGS = -mcpu=arm926ej-s -mthumb -mfloat-abi=hard *in the .cfg file for the BSP. But during the BSP build, it gives error "configure: error: C compiler cannot create executables". How can I enable hard float support in my BSP? *As a trial, I have built BSP with CPU_CFLAGS = -mcpu=arm926ej-s -mthumb and manually added* *CPU_CFLAGS = -mcpu=arm926ej-s -mthumb -mfloat-abi=hard in the makefile (Makefile.leaf) for application build.* *In this case, I'm getting error 'error: o-optimize/init.o uses VFP register arguments, o-optimize/rtems-app.exe does not'* *As per RTEMS CPU Architecture Supplement Release 5.0.0 (master) Section 3.1.3 Floating Point Unit only* *VFPv3-D32, **VFPv3-D16 and * *FPv4-SP-D16 are supported by RTEMS, but VFP9-S Floating point coprocessor is an * *implementation of the Vector Floating-point Architecture (VFPv2) which is not listed in 3.1.3.* *Does this state that VFP9-S Floating point coprocessor is not supported by RTEMS?* *For your info floating point operations are working fine in the application built using -mfloat-abi=soft.* *Thanks in advance for all your precious time.* *Regards, * *Amarnath MB*
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