Date: Mon, 17 Dec 2001 21:36:17 -0500 (EST) From: Garrett Wollman <wollman@khavrinen.lcs.mit.edu> To: imp@harmony.village.org Cc: arch@FreeBSD.org Subject: Re: Please review: changes to MI bus code for sparc64 Message-ID: <200112180236.fBI2aHM39997@khavrinen.lcs.mit.edu> In-Reply-To: <200112180212.fBI2CUM81074@harmony.village.org> References: <20011213211544.A4747@crow.dom2ip.de> <20011213192033.A871@crow.dom2ip.de> <200112131901.fBDJ1hl02003@mass.dis.org> <20011213211544.A4747@crow.dom2ip.de>
next in thread | previous in thread | raw e-mail | index | archive | help
In article <200112180212.fBI2CUM81074@harmony.village.org> you write: >I don't understand the difference between boundary and alignment. A boundary is a locus which an allocation must not cross. Consider, for example, the crufty old ISA DMA hardware: 16-bit transfers need only 16-bit alignment, but must not cross a 64-kbyte ``page'' boundary, because the address-generation logic was kluged out of a 16-bit DMA controller and an 8-bit latch. -GAWollman -- Garrett A. Wollman | O Siem / We are all family / O Siem / We're all the same wollman@lcs.mit.edu | O Siem / The fires of freedom Opinions not those of| Dance in the burning flame MIT, LCS, CRS, or NSA| - Susan Aglukark and Chad Irschick To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200112180236.fBI2aHM39997>