Subject: Re: Rev 1.19 of busdma.doc
To: None <email@example.com>
From: Chris G Demetriou <Chris_G_Demetriou@ux2.sp.cs.cmu.edu>
Date: 11/09/1996 23:11:35
oops! i forgot the "more in a bit" bit... 8-)
Re: device DMA into other devices' space:
(1) if target device is on the same bus, then bus addresses
should be pretty easy.
(2) if target device is on a different bus, then you need
to translate the address on one to the address on another.
The bus_dma* interfaces proposed here were intended for device<->memory
transfers, however. I'm willing to say "cross the other bridge when
we come to it for real," since the possibility space is ... very large
and we need a real, practical solution to this problem Soon.