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From: Matthew Wilcox <matthew@wil.cx>
To: parisc-linux@thepuffingroup.com
Subject: [parisc-linux] ZONE_DMA
Date: Mon, 1 Jan 2001 17:43:31 +0000	[thread overview]
Message-ID: <20010101174331.A21918@parcelfarce.linux.theplanet.co.uk> (raw)


I notice that right now we're partitioning our memory 50% into DMAable
memory and 50% into normal memory (and 0% into HIGHMEM -- but I believe
this part to be correct).  I can't believe that's really the limit of
memory we can DMA into.

I'm not familiar with the hardware problem here.  Must EISA cards be
restricted to a certain part of the address space?  I can glean from
the source that ISA cards are restricted to a 16MB address space --
are we going to support ISA cards?

I presume that no machine which supports ISA cards has an IOMMU that is
capable of mapping a chunk of higher ram into the 16MB bus address space.

-- 
Revolutions do not require corporate support.

             reply	other threads:[~2001-01-01 17:40 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-01-01 17:43 Matthew Wilcox [this message]
2001-01-01 18:09 ` [parisc-linux] ZONE_DMA Alan Cox
2001-01-01 18:24   ` Matthew Wilcox
2001-01-01 18:32     ` Alan Cox
2001-01-01 18:55       ` Matthew Wilcox
2001-01-01 19:01         ` Alan Cox
2001-01-01 19:18           ` Matthew Wilcox
2001-01-02  0:59   ` Grant Grundler
2001-01-02  1:21     ` Matthew Wilcox
2001-01-02  6:46       ` Grant Grundler

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