Aurele Traynard wrote:
> 2011/4/22 Gilles Chanteperdrix <[email protected]>
>
>> Aurele Traynard wrote:
>>> ok i'm sorry i wasn't clear at all...
>>> my problem is : when i call readl in a rt_task, the task is stopped...
>>> (maybe because the rt_task is launched in a module?)
>>> "Xenomai: suspending kernel thread bf0041c8 ('test_rt') at 0xbf003824
>> after
>>> exception #0"
>>> if i remove the readl there is no problem
>>>
>>> With a normal Linux, in a module there isn't any problem
>> On what platform? I can think of two things:
>> - the platform you use maps the ioremaped memory on-demand (x86 and ARM
>> at least do not allow this, but I do not know about other platforms)
>> - you are making an unaligned access, it works with Linux because it has
>> a handler for handling unaligned accesses, whereas Xenomai default
>> handler is to simply suspend a task doing this kind of things.
>>
>> Please do not forget to CC the mailing list.
>>
>> --
>> Gilles.
>>
> I'm working with PXA270 (ARMv5te), FPGA's registers physicaly are mapped as
> CPU's registers... so it is alligned (i read 0x040001C0 and i use a 32bits
> integer....)
> so if i understand it should work...
Are you sure 0x040001C0 is a virtual address?
--
Gilles.
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