Fatal error: C3903U: Argument 'neon' not permitted for option 'fpu'.

Neon is enabled by default when compiling for Cortex-A9.

Use:

armcc -cpu=list

and see the available options:

...
 --cpu=Cortex-A9
 --cpu=Cortex-A9.no_neon
 --cpu=Cortex-A9.no_neon.no_vfp
...

Neon is enabled by default when compiling for Cortex-A9.

Use:

armcc -cpu=list

and see the available options:

...
 --cpu=Cortex-A9
 --cpu=Cortex-A9.no_neon
 --cpu=Cortex-A9.no_neon.no_vfp
...

See also https://developer.arm.com/documentation/102731/0100/Enabling-NEON

Ronan Synnott

after using --cpu= Cortex-A9

multi errors of:

"CMSIS/CMSIS_CORE/Include/cmsis_armcc.h", line 169: Error: #667: "asm" function is nonstandard
__attribute__((section(".rev16_text"))) __STATIC_INLINE __ASM uint32_t __REV16(uint32_t value)
^

happened.

in arm_cmsis.h

#define __ASM        __asm already.

reguards

Hi Alex

I can reproduce what you see, but only when compiling for --c99 AND --strict.

Do you really need to use --strict?  If so, you will need to rewrite the "embedded assembler" functions in cmsis_armcc.h as "inline assembler" instead.

For example, replace

__attribute__((section(".rev16_text"))) __STATIC_INLINE __ASM uint32_t __REV16(uint32_t value)
{
  rev16 r0, r0
  bx lr
}

with, for example,

__attribute__((section(".rev16_text"))) __STATIC_INLINE uint32_t __REV16(uint32_t value)
{
  uint32_t result;
  __asm("rev16 result, value");
  return result;
}

For more information on "embedded assembler" and "inline assembler" in Arm Compiler 5, see:
developer.arm.com/.../Using-the-Inline-and-Embedded-Assemblers-of-the-ARM-Compiler

Is there a particular reason why you are using the old Arm Compiler 5?
The latest version of CMSIS (CMSIS 6.0.0) no longer supports Arm Compiler 5.
I strongly recommend that you update from Arm Compiler 5 to Arm Compiler for Embedded 6.

Hope this helps

Stephen

Stephen Theobald

thank you for the help

as for the reason why, it is the old version project forced me to do that.

The project used an old hardware lib that doesn't support the ARMCC 6.(or massive works need to be done).

I think that's all I need right now, thanks for the hlep.

Reguards

Alex