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Date: Sat, 16 Feb 2002 22:44:16 +0100
From: Francois Romieu <romieu@cogenit.fr>
To: Eric Gillespie <viking@flying-brick.caverock.net.nz>
Cc: linux-kernel@vger.kernel.org
Subject: Re: What? Clock Slowdown Again?
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Eric Gillespie <viking@flying-brick.caverock.net.nz> :
[...]
> Also, what are the plans for replacing the virt_to_bus / bus_to_virt
> functions?  The sourcecode basically says to use pci_map functions, but, being
> almost a kernel illiterate (I know how to compile, apply patches, and not much
> else) I don't know how to get started on converting.  I thought that
> pci_resource_{start,end,len} may also be needed too.  Am I right?

Look at Documentation/DMA-mapping.txt, section "Types of DMA mappings"
Read it again from the start. If you aren't familiar with PCI, 
http://ww.google.com/search?hl=en&q=PCI+dual+address+cycle+explanation may
help. Then look at drivers/net/{epic/eepro100/3c59x}.c and grep for the
functions quoted in DMA-mapping.txt. After that, glue all the pieces in 
your head. 

-- 
Ueimor
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