From: budheej@gmail.com (Budhee Jamaich)
To: linux-arm-kernel@lists.infradead.org
Subject: mapping uncached memory
Date: Tue, 23 Mar 2010 14:22:15 +0200 [thread overview]
Message-ID: <57314e841003230522k4219e31fw2b5ab610faeda767@mail.gmail.com> (raw)
In-Reply-To: <20100316235422.GC13948@n2100.arm.linux.org.uk>
On Wed, Mar 17, 2010 at 1:54 AM, Russell King - ARM Linux
<linux@arm.linux.org.uk> wrote:
> On Wed, Mar 17, 2010 at 01:17:45AM +0200, Budhee Jamaich wrote:
>> these are the alternatives we currently see:
>>
>> 2. use pgprot_noncached when assigning vma->vm_page_prot in our
>> driver's mmap method
>>
>>
>> will that really work ? all memory accesses will be uncached ?
>
> Not on ARMv6 and above - it has become illegal to remap memory with
> differing type attributes.
what about using pgprot_dmacoherent in our driver to mark memory as
uncached ? will this work ?
thank you
budhee
prev parent reply other threads:[~2010-03-23 12:22 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-16 23:17 mapping uncached memory Budhee Jamaich
2010-03-16 23:54 ` Russell King - ARM Linux
2010-03-17 4:34 ` Jamie Lokier
2010-03-17 8:02 ` Budhee Jamaich
2010-03-17 8:15 ` Russell King - ARM Linux
2010-03-17 9:09 ` Budhee Jamaich
2010-03-17 21:26 ` Colin Cross
2010-03-17 22:03 ` Catalin Marinas
2010-03-23 12:22 ` Budhee Jamaich [this message]
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