From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailserv2.iuinc.com (IDENT:qmailr@mailserv2.iuinc.com [206.245.164.55]) by puffin.external.hp.com (8.9.3/8.9.3) with SMTP id KAA17874 for ; Mon, 1 Jan 2001 10:40:21 -0700 Received: from parcelfarce.linux.theplanet.co.uk (HELO www.linux.org.uk) (195.92.249.252) by mailserv2.iuinc.com with SMTP; 1 Jan 2001 17:43:31 -0000 Received: from willy by www.linux.org.uk with local (Exim 3.13 #1) id 14D8zb-0005mN-00 for parisc-linux@thepuffingroup.com; Mon, 01 Jan 2001 17:43:31 +0000 Date: Mon, 1 Jan 2001 17:43:31 +0000 From: Matthew Wilcox To: parisc-linux@thepuffingroup.com Message-ID: <20010101174331.A21918@parcelfarce.linux.theplanet.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: Subject: [parisc-linux] ZONE_DMA List-ID: 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.