From: Callebaut Benoit <callebaut@mailandnews.com>
To: linuxppc-embedded@lists.linuxppc.org
Subject: What kind of Linux address must I use to set the SAR reg. of the DMA ctrl ?
Date: Wed, 7 May 2003 02:52:06 -0400 [thread overview]
Message-ID: <3EC0E6EE@mailandnews.com> (raw)
Hello,
I am writing the code to start a DMA transfer with the built-in DMA controller
of the MPC8245. The purpose is to do Memory to PCI transfers. The PCI part
seems to be OK ( memory of the device is written) the the source address seems
to be wrong since I read 0XFFFFFFFF as data in the device. I tried with bus
and physical address (using virt_to_bus & virt_to_phys functions) but this
doesn't give good results.
So I ask myself which kind of linux address must I use to configure the SAR
register of the Dual channel DMA controller ?
If It works I will post a patch of my work.
Thanks
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Benoit Callebaut
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Fax +32(0)56 36 86 05
mailto:benoit.callebaut@barco.com
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next reply other threads:[~2003-05-07 6:52 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-07 6:52 Callebaut Benoit [this message]
2003-05-07 7:50 ` What kind of Linux address must I use to set the SAR reg. of the DMA ctrl ? Matt Porter
-- strict thread matches above, loose matches on Subject: below --
2003-05-07 13:14 Callebaut Benoit
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