Context switching for VFP registers on Cortex-A8 board.

[Thomas Kim]

Dear Sebastian,

I used lastest RTEMS source on https://github.com/RTEMS/rtems.

Is there initialization code(start.S) for handling SCTLR.A bit on current
source tree ?

Best Regards,
Thomas Kim

2014-12-02 19:27 GMT+09:00 Sebastian Huber <
sebastian.huber at embedded-brains.de>:

> Hello,
>
> 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
>
> Address : Dornierstr. 4, D-82178 Puchheim, Germany
> Phone   : +49 89 189 47 41-16
> Fax     : +49 89 189 47 41-09
> E-Mail  : sebastian.huber at embedded-brains.de
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>
> Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
>
>
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