On Tuesday, August 31, 2010 1:54:49 pm Matthew Jacob wrote: > But not amd64 please. > > > Keep in mind the PAE case where you cannot effectively specify a 4GB > > boundary. I used a 2GB boundary for twa(4) in the PAE case to deal > > with the boundary issue. Probably though, bus_dma should just always > > enforce a 4GB boundary, at least on x86.
Yes, thinking about this more, only i386 + PAE is special. All other cases could represent the 4GB boundary restriction in a bus dma tag for the PCI bus (or in the platform-specific Host-PCI bridge drivers). For i386 + PAE it might make sense to always enforce a 4GB boundary in the bus_dma code itself. -- John Baldwin _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
