Date: Tue, 06 Aug 2013 08:59:55 +0200 From: Hans Petter Selasky <hps@bitfrost.no> To: "aseem.jolly" <aseem.jolly@gmail.com> Cc: freebsd-usb@freebsd.org Subject: Re: USB DMA memory Allocation Message-ID: <52009EEB.1040404@bitfrost.no> In-Reply-To: <1375752286864-5834206.post@n5.nabble.com> References: <1375489015367-5833506.post@n5.nabble.com> <zarafa.51fcc634.4d66.6bc5f4d2757b93c5@mail.lockless.no> <1375551235535-5833585.post@n5.nabble.com> <zarafa.51fe1344.72a4.2c750fca3ae0393f@mail.lockless.no> <1375752286864-5834206.post@n5.nabble.com>
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On 08/06/13 03:24, aseem.jolly wrote: > I don't want to play around with 'kern.maxbcache', can we actually allow > driver to support 64 bit DMA? > In future we can use a bootarg/sysctl to enable this support if someone > comes across this issue else we will use 32 bit DMA allocations. > > I am willing to enable this support, please guide me. > Hi, You can start with the EHCI driver, if you like. Download the EHCI PDF from INTEL's site. Figure out all the 32-bit HIGH fields and put valid data in them. For all 32-bit address there is a corresponding 32-bit high field. Thank you! --HPS
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