From: "Alexey Shinkin" <alexshinkin@hotmail.com>
To: linux-mips@linux-mips.org
Subject: Re: Au1550 - Problem access Shared memory from PCI card
Date: Thu, 16 Sep 2004 18:38:23 +0700 [thread overview]
Message-ID: <BAY15-F19LS73JsNgMI0005f044@hotmail.com> (raw)
>There's no reason why this shouldn't work and it doesn't smell like a
>hardware problem.
>
The problem is solved !
The reason was that shared memory on host have been allocated using
__get_free_pages(GFP_KERNEL, get_order(NumberOfBytes))
it returned addresses like 0x8xxxxxxx (KSEG0, cacheable)
I was adviced to use pci_alloc_consistent() instead , this function uses
__get_free_pages
but sets some GFP flags and returns addresses like 0xAxxxxxxx (KSEG1).
With this function all works fine !
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next reply other threads:[~2004-09-16 12:12 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-16 11:38 Alexey Shinkin [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-09-16 5:55 Au1550 - Problem access Shared memory from PCI card Alexey Shinkin
2004-09-16 7:50 ` Pete Popov
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