From: Roberto Bielli <roberto.bielli@axelsw.it>
To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai] fcse best-effort mode has limitations in memory map
Date: Mon, 05 Aug 2013 12:26:57 +0200 [thread overview]
Message-ID: <51FF7DF1.9010606@axelsw.it> (raw)
In-Reply-To: <51FE5208.9090008@xenomai.org>
That's right.
i didn't pass MAP_FIXED but always mmap without FCSE gave me the same
address.
FCSE with best effort works also with memory larger than 32MB.
Il 04/08/2013 15:07, Gilles Chanteperdrix ha scritto:
> On 07/26/2013 02:13 PM, Roberto Bielli wrote:
>
>> Hi,
>>
>> i try to map a memory address fixed on 0x79000000 with mmap.
>> if i don't enable FCSE with best effort the mmap give me the desire
>> wanted address,
>> otherwise seems only an adress minor than 32MB.
>>
>> But i understand that fcse with best effort cannot has limitations.
>>
>> Xenomai 2.6.2.1 on kernel 3.4.6, tx28 karo ( freescale imx28 ) ARM.
>
>
> Well, actually it works here, maybe you forgot to pass the "MAP_FIXED"
> flag? If you do not pass this flag, the address is taken as a "hint",
> and mmap has no obligation to use it.
>
--
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Roberto Bielli
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prev parent reply other threads:[~2013-08-05 10:26 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-26 12:13 [Xenomai] fcse best-effort mode has limitations in memory map Roberto Bielli
2013-08-04 12:20 ` Gilles Chanteperdrix
2013-08-04 13:07 ` Gilles Chanteperdrix
2013-08-05 10:26 ` Roberto Bielli [this message]
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