Messages in this thread | | | From | (H. Peter Anvin) | Subject | Re: Address spaces on a i386 - Getting Confused | Date | 5 Apr 1999 14:45:47 GMT |
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Followup to: <Pine.LNX.4.04.9904051634060.723-100000@cheetah.psv.nu> By author: Peter Svensson <petersv@psv.nu> In newsgroup: linux.dev.kernel > > On Mon, 5 Apr 1999, Eric Lowe wrote: > > > Agreed. From what we've seen, most PCI devices running on 64-bit systems > > are already going 64-bit. > > The problem of 32 bits on >4GB will probably be isolated to Intel. Why > > would someone put an older, $50 board in a $10k workstation anyway? > > Many sepcialized pci-devices are only made as 32-bit cards. The cost of > developing a new card only to make a few of them is often prohibitive. > When 64-bit architectures are the norm this will probably change. >
The good news is that many 32-bit cards support Dual Address Cycle for 64-bit addressing. The bad news is that I don't even think it is the majority.
-hpa
-- "The user's computer downloads the ActiveX code and simulates a 'Blue Screen' crash, a generally benign event most users are familiar with and that would not necessarily arouse suspicions." -- Security exploit description on http://www.zks.net/p3/how.asp
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