On 01/07/14 22:40, Ian Lepore wrote: > Author: ian > Date: Wed Jan 8 03:40:18 2014 > New Revision: 260440 > URL: http://svnweb.freebsd.org/changeset/base/260440 > > Log: > Add option USB_HOST_ALIGN to configs that contain 'device usb'. Setting > this to the cache line size is required to avoid data corruption on armv4 > and armv5, and improves performance on armv6, in both cases by avoiding > partial cacheline flushes for USB IO. > > All these configs already exist in 10-stable. A few that don't (and > thus can't be MFC'd yet) will be committed separately. >
There has to be -- and I do not mean this as a criticism of your patch -- a better solution to this problem than USB_HOST_ALIGN. Isn't busdma supposed to handle this kind of thing? Why is USB different? -Nathan _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
