From: "DI BACCO ANTONIO - technolabs" <Antonio.DiBacco@technolabs.it>
To: <linuxppc-embedded@ozlabs.org>
Subject: __pa(dma_alloc_coherent()) doesn't give physical address
Date: Mon, 26 Feb 2007 16:54:53 +0100 [thread overview]
Message-ID: <F1F6EC0C8B75034F9E3A79FC85122E8E682C13@aquib01a> (raw)
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dma_alloc_coherent gives a kernel virtual address as a return address,
applying __pa I expected a physical address.
It doesn't happen, I receive an address far beyond my 16 MB ram.
Applying virt_to_bus doesn't give a physical address too.
OK, you can resort to dma_addr_t parameter of dma_alloc_coherent but is
there a reason for __pa not working on a kernel virtual address?
Bye,
Antonio.
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next reply other threads:[~2007-02-26 15:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-26 15:54 DI BACCO ANTONIO - technolabs [this message]
2007-02-26 16:26 ` __pa(dma_alloc_coherent()) doesn't give physical address Dan Malek
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