From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Petazzoni Date: Tue, 15 Sep 2015 15:03:03 +0200 Subject: [Buildroot] [RFC 3/6] system: add mdev-only /dev management (without devtmpfs) In-Reply-To: <55F80E9C.7070208@mind.be> References: <1441747734-18730-1-git-send-email-luca@lucaceresoli.net> <1441747734-18730-4-git-send-email-luca@lucaceresoli.net> <55EFF9FF.1020402@mind.be> <55F02630.5050500@lucaceresoli.net> <20150909155427.53f9c8b5@free-electrons.com> <87bnd43eph.fsf@dell.be.48ers.dk> <20150914233402.3575da80@free-electrons.com> <87zj0oznp2.fsf@dell.be.48ers.dk> <20150915093030.622d2366@free-electrons.com> <87zj0oumrg.fsf@dell.be.48ers.dk> <20150915114159.758baca9@free-electrons.com> <87k2rrvqlh.fsf@dell.be.48ers.dk> <55F80E9C.7070208@mind.be> Message-ID: <20150915150303.61e5449e@free-electrons.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net Dear Arnout Vandecappelle, On Tue, 15 Sep 2015 14:27:08 +0200, Arnout Vandecappelle wrote: > > > On 15-09-15 14:01, Peter Korsgaard wrote: > > Or alternatively, extend the S10mdev logic to detect that it need to > > create a tmpfs on /dev (by looking for devtmpfs in /proc/filesystems or > > detecting that /dev is RO) and have all the fixup there. That way it > > atleast doesn't add any more complications to the rest of Buildroot / > > users. > > That's a great idea, because it actually simplifies the buildroot code (no > longer needed to force devtmpfs in the kernel when mdev is selected). > > To detect, it's as simple as: > > if [ "$(cut -d ' ' -f 2,3 /proc/mounts | sed -n '/^\/dev /s///p')" != devtmpfs ] But then, who creates /dev/console when devtmpfs is not available? We have it unconditionally? Best regards, Thomas -- Thomas Petazzoni, CTO, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com