On 04/01/2019 20:52, Amarnath MB wrote:
Hi,
I'm working on RTEMS 5.0 BSP for a new SOC based on ARM926EJS which
hasaVFP9-S Floating point coprocessor inside.
I was able to successfully boot RTEMS and run hello.exe and ticker.exe
testsuite samples using u-boot.
Ihave 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'*
***
*
You try to link objects with incompatible ABIs together and the linker
is kind enough to let you not do this. You have to make sure that all
your objects are compiled with the right combination of machine flags.
*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?*
This section was out of date. I updated it:
https://docs.rtems.org/branches/master/cpu-supplement/arm.html#multilibs
*
*
*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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