Date: Fri, 15 Feb 2013 08:21:26 -0500 From: John Baldwin <jhb@freebsd.org> To: Adrian Chadd <adrian@freebsd.org> Cc: Poul-Henning Kamp <phk@phk.freebsd.dk>, freebsd-current@freebsd.org, "C. P. Ghost" <cpghost@cordula.ws>, current@freebsd.org Subject: Re: Time to kill fdc ? Message-ID: <201302150821.26154.jhb@freebsd.org> In-Reply-To: <CAJ-VmokUhi-EgtwEOBqZMOmp-DOwj4OSweHVg5Lcu3b_U_cVvA@mail.gmail.com> References: <79955.1360494404@critter.freebsd.dk> <201302141635.15938.jhb@freebsd.org> <CAJ-VmokUhi-EgtwEOBqZMOmp-DOwj4OSweHVg5Lcu3b_U_cVvA@mail.gmail.com>
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On Thursday, February 14, 2013 9:45:22 pm Adrian Chadd wrote: > On 14 February 2013 13:35, John Baldwin <jhb@freebsd.org> wrote: > > > ISA bounces anything above 16GB. They are bouncing. I know it works for some > > people as I fixed a bug in the ISA bounce buffer code somewhat recentish: > > You mean 16MB, right? Yes, doh! > There's a secondary bounce buffer thing needed for 32 bit PCI devices > on a 64 bit machine with > 4 GB of physical RAM, right? That is handled via the tags passed to bus_dma. ISA DMA doesn't currently use bus_dma but reimplements its own bounce handling. -- John Baldwin
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