Date: Mon, 25 Dec 2017 22:44:58 +0100 From: Emmanuel Vadot <manu@bidouilliste.com> To: Warner Losh <imp@bsdimp.com> Cc: "freebsd-hackers@freebsd.org" <hackers@freebsd.org> Subject: Re: devmatch(8) committed .... Message-ID: <20171225224458.e925f49181221a2315a1974f@bidouilliste.com> In-Reply-To: <CANCZdfq-yaOjpPU_U8=oeRZ7G7un%2BEbkDSyiXp2xW6=h-YgyxQ@mail.gmail.com> References: <CANCZdfq-yaOjpPU_U8=oeRZ7G7un%2BEbkDSyiXp2xW6=h-YgyxQ@mail.gmail.com>
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Hello Warner, On Mon, 25 Dec 2017 11:57:10 -0700 Warner Losh <imp@bsdimp.com> wrote: > 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. > > 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! > > Warner This is all excellent news I can't wait to try. I've not currently started to look at the code but have you thought of fdt based system ? I would love a minimal GENERIC arm/arm64 kernel with everything else in modules. I know we still have to do a lot of work in the arm world to make almost everything usable in module form. -- Emmanuel Vadot <manu@bidouilliste.com> <manu@freebsd.org>
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