Context switching for VFP registers on Cortex-A8 board.

Sebastian Huber sebastian.huber at
Tue Dec 2 10:27:03 UTC 2014


you use a BSP that is not included in the main RTEMS sources, so I can 
only guess.

On 02/12/14 11:16, Thomas Kim wrote:
> Dear  Sir.
> I completed to port RTEMS on Cortex-A8 board using below option.
>   CPU_CFLAGS = -march=armv7-a -mtune=cortex-a8 -mfpu=neon 
> -mfloat-abi=softfp
> At this time, RTEMS sample example(ticker.exe) is working very well.
> Because there is a problem for executing C++ exception example using 
> "-mfloat-abi=softfp", I changed below option.
>   CPU_CFLAGS = -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mfloat-abi=hard
> After I rebuild RTEMS using "-mfloat-abi=hard", I am tring to test 
> both ticker.exe and cxx_throw.exe.
> But, both examples are crashed in mount() function of 
> rtems_filesystem_initialize().
> In detailly, memcpy() of alloc_mount_table_entry() is called, 
> exception is ocurred.

There are many exceptions and some provide extra information, so 
"exception is occurred" is a very vague description.

You probably use the wrong memory attributes.  Make sure misaligned 
memory access is possible.  See SCTLR.A bit (ARM_CP15_CTRL_A).

Sebastian Huber, embedded brains GmbH

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