Date: Fri, 2 Aug 2013 17:16:55 -0700 (PDT) From: "aseem.jolly" <aseem.jolly@gmail.com> To: freebsd-usb@freebsd.org Subject: USB DMA memory Allocation Message-ID: <1375489015367-5833506.post@n5.nabble.com>
next in thread | raw e-mail | index | archive | help
It seems to me that Intel ehci controller supports 64 DMA address lines (HCCPARAMS register's 0 bit is set hardwired) then why do force DMA allocation from [0 4GB] range. I tried to enable 64 bit DMA allocations by modifying call to 'usb_dma_tag_setup' in usb_controller.c and usb_transfer.c but got a device disconnect after we preallocated DMA memory for USB transfers. Would be really great if someone could guide me on this. -- View this message in context: http://freebsd.1045724.n5.nabble.com/USB-DMA-memory-Allocation-tp5833506.html Sent from the freebsd-usb mailing list archive at Nabble.com.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?1375489015367-5833506.post>