Date: Tue, 26 Dec 2017 15:03:32 -0800 From: "Chris H" <bsd-lists@BSDforge.com> To: "Warner Losh" <imp@bsdimp.com> Cc: "hackers@freebsd.org>" <freebsd-hackers@freebsd.org> Subject: Re: devmatch(8) committed .... Message-ID: <cc9143e23c543d9ba20ab983f9c4bf02@udns.ultimatedns.net> In-Reply-To: <CANCZdfq-yaOjpPU_U8=oeRZ7G7un%2BEbkDSyiXp2xW6=h-YgyxQ@mail.gmail.com>
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On Mon, 25 Dec 2017 11:57:10 -0700 "Warner Losh" <imp@bsdimp.com> said > I've committed devmatch(8) to the tree in r327176. It's a building block > for automating the loading of modules. While we can load modules today by > adding FOO_load=YES to loader.conf, there's no easy way to load only the > modules you need based on the hardware you have in the system. devmatch(8) > provides the base framework to allow one to do that. It does this my > looking at the PNP tables recorded in /boot/kernel/linker.hints. I've been *going* to something like this for a long time. Thank you!!! > > The version I've committed doesn't have the devd nor the rc.d integration. > I've committed it for people to play with and give me feedback while those > parts are finalized (and while other bugs are fixed). I don't intend to > commit them until the kinks are worked out. > > Some notes: > > (1) You'll need a newly built kernel. Older kernels have minor bugs that > allowed the terminating sentinel to be included in linker hints. All known > oens, at least for amd64, have been fixed. > (2) Lots and lots of drivers need to have their plug and play tables > decorated. This is where I need people's help. I'll be writing up something > for those that want to help. ISAPNP, PC Card and USB drivers already have > this data. A few PCI drivers have it, and almost no ACPI drivers. The data > is generally there, just not properly decorated for devmatch(8) and > kldxref(8) to do their thing. > (3) There's an issue with the USB pnp data. It's too long for the current > devinfo(3) interfaces. I have fixes in the works to correct this. I could > just bump the limits, but I want to do something more general and long term. > (4) The end game for this is a GENERIC with most of the drivers removed > that loads drivers automatically. Bootable storage drivers will have to > remain for now until the loader can make use of this code.This is why the > warning about hinted ISA devices went into the tree this week. > (5) modules will print more than once. also the if_em/if_igb driver is a > hard link so both of those will always print. > > Please send me your feedback. Happy Holidays! Right back at you, and thanks again! --Chris > > Warner
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