Date: Fri, 04 Jul 2008 12:42:35 -0700 From: Marcel Moolenaar <xcllnt@mac.com> To: "M. Warner Losh" <imp@bsdimp.com> Cc: arch@freebsd.org, sam@freebsd.org, freebsd-current@freebsd.org, ed@80386.nl Subject: Re: MPSAFE TTY schedule [uart vs sio] Message-ID: <C7053D65-A0F0-4ACD-A68D-49A4AD6805AE@mac.com> In-Reply-To: <20080704.063540.1210476607.imp@bsdimp.com> References: <20080703205220.GW14567@hoeg.nl> <486D4006.2050303@freebsd.org> <993E865A-A426-4036-9E09-A87D7474DE80@mac.com> <20080704.063540.1210476607.imp@bsdimp.com>
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On Jul 4, 2008, at 5:35 AM, M. Warner Losh wrote: > : I looked into it in 2003 but since I don't have any hardware, > : I wasn't the one able to do it. I think the fundamental problem > : is that the BRG is not part of the UART itself and needs a > : separate handle or even (tag, handle) pair to access. That's as > : far as I know the only big thing about the work. > : > : For me not having access to the hardware is a showstopper for > : looking into it myself. > > Do you need physical access? No, not at all. As long as the USART is connected to another UART that I can access and as long as I can load/unload the uart(4) module, I should be able to write the support for it. Even only restricted sudo(1) should be fine. > I have a pc98 machine I can put back on > the network. It has the 8251 chip in it. It also has a 16550 part as > well since it is a later model which had both... Perfect. A null-modem cable between the two of them and I should be all set. -- Marcel Moolenaar xcllnt@mac.com
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