From: "tiejun.chen" <tiejun.chen@windriver•com>
To: "Arshad, Farrukh" <Farrukh_Arshad@mentor•com>
Cc: Scott Wood <scottwood@freescale•com>,
"linuxppc-dev@lists•ozlabs.org" <linuxppc-dev@lists•ozlabs.org>
Subject: Re: Problem in getting shared memory access on P1022RDK
Date: Thu, 5 Jan 2012 10:09:23 +0800 [thread overview]
Message-ID: <4F050653.6010601@windriver.com> (raw)
In-Reply-To: <93CD5F41FDBC6042A6B449764F3B35CC050CCB2E@EU-MBX-03.mgc.mentorg.com>
Arshad, Farrukh wrote:
> How can I verify if the memory mapped is coherent on both cores. My memory partitioning is given below
>
> Core Base Address Size
> Core 0 0x0000,0000 0x1000,0000 --> CONFIG_PHYSICAL_START = bootm_low = Base Address
> Core 1 0x1000,0000 0x0C00,0000 --> CONFIG_PHYSICAL_START = bootm_low = Base Address
> Shared Mem 0x1C00,0000 0x0400,0000
Was the kernel option, CONFIG_SMP, enabled for both two kernels?
CONFIG_SMP would affect the memory attribute for cache coherency. Maybe you
should make sure if kernel have a appropriate memory attribute by dumping TLB entry.
Tiejun
>
> Regards,
> Farrukh Arshad
>
> -----Original Message-----
> From: Scott Wood [mailto:scottwood@freescale•com]
> Sent: Tuesday, January 03, 2012 10:10 PM
> To: Arshad, Farrukh
> Cc: linuxppc-dev@lists•ozlabs.org
> Subject: Re: Problem in getting shared memory access on P1022RDK
>
> On 01/03/2012 03:42 AM, Arshad, Farrukh wrote:
>> Adding more to it,
>>
>>
>>
>> When I write from Core 1 on the shared memory region it is visible at
>> Core 0 and it can read what I have written from Core 1 but when I
>> write from Core 0 on this shared memory it is not visible on Core 1.
>
> Is the memory mapped coherent on both cores?
>
> -Scott
next prev parent reply other threads:[~2012-01-05 2:09 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-02 19:10 Problem in getting shared memory access on P1022RDK Arshad, Farrukh
2012-01-03 9:42 ` Arshad, Farrukh
2012-01-03 17:10 ` Scott Wood
2012-01-04 6:49 ` Arshad, Farrukh
2012-01-05 2:09 ` tiejun.chen [this message]
2012-01-05 5:46 ` Arshad, Farrukh
2012-01-11 15:52 ` Arshad, Farrukh
2012-01-12 8:09 ` tiejun.chen
2012-01-25 11:04 ` Arshad, Farrukh
2012-01-29 3:15 ` tiejun.chen
2012-01-04 9:56 ` Arshad, Farrukh
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