Date: Fri, 04 Jul 2008 15:06:48 -0700 From: Marcel Moolenaar <xcllnt@mac.com> To: John Baldwin <jhb@freebsd.org> Cc: Alexey Shuvaev <shuvaev@physik.uni-wuerzburg.de>, freebsd-current@freebsd.org, Dmitry Morozovsky <marck@rinet.ru> Subject: Re: puc(4) man page update? Message-ID: <70771DF0-71BB-453F-949E-6A50DD7D0D71@mac.com> In-Reply-To: <200807041733.25301.jhb@freebsd.org> References: <20080701181358.GA93601@wep4017.physik.uni-wuerzburg.de> <20080704135827.H35668@woozle.rinet.ru> <22A6B038-44BB-4072-8A6E-8C1D5855CB14@mac.com> <200807041733.25301.jhb@freebsd.org>
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On Jul 4, 2008, at 2:33 PM, John Baldwin wrote: > On Friday 04 July 2008 03:31:41 pm Marcel Moolenaar wrote: >> >> On Jul 4, 2008, at 2:59 AM, Dmitry Morozovsky wrote: >> >>> doesn't splitting uart out of kernel broke serial console? Last time >>> I checked >>> it did. >> >> Yes, it does. The serial console is setup/initialized and >> used before pre-loaded modules are linked and/or usable. >> We don't have the support in place that allows you to boot >> without console until pre-loaded modules are initialized, >> at which time add a low-level console device is setup. >> It's not that hard to do, I think. >> >> So, currently low-level console drivers, such as dcons(4), >> sio(4) and uart(4) need to be compiled into the kernel. >> Consequently any devices/busses to which any of these can >> attach must be compiled into the kernel as well. Of these >> acpi(4) and puc(4) are good examples. acpi(4) is a good >> example because we use hints to work around the issue and >> have sio(4) attach to isa(4) instead... > > Actually, sio does attach to acpi0. What happens for sio is that the > low-level console stuff is just doing bare-bones inb/outb anyway. > sioX > devices do attach to acpi0 though just fine. That's because sio(4) compiles-in the acpi bus attachment even if acpi is not compiled-in. That's cheating :-) -- Marcel Moolenaar xcllnt@mac.com
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