Date: Thu, 13 May 2004 05:48:55 +1000 (EST) From: Bruce Evans <bde@zeta.org.au> To: Roman Kurakin <rik@cronyx.ru> Cc: freebsd-current@freebsd.org Subject: Re: Sio & Puc memory mapped Message-ID: <20040513054339.E13728@gamplex.bde.org> In-Reply-To: <40A26162.9030607@cronyx.ru> References: <40A26162.9030607@cronyx.ru>
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On Wed, 12 May 2004, Roman Kurakin wrote: > Does any body workin on support for memory mapped serial adapters? > As I understand puc (4) allows to add support for such card, but sio (4) > cant > serve them any way. > If nobody doesn't, why so? If no one of developers bother, does anybody > wants this support? There is little need for it, because it is normal for pci 16550 cards to have i/o-mapped memory (possibly both memory-mapped and i/o mapped). I have uncommitted changed to use memory-mapped i/o for accessing the data registers only, since memory mapped i/o tends to be faster. Implementing memory-mapped i/o more generally is easier. Bruce
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