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Bug 463475

Summary: devtmpfs filesystem support requirement needed for udev operation is not mentioned
Product: [OLD] Docs on www.gentoo.org Reporter: Vasyl Tretiakov <vasyl.tretiakov>
Component: Installation HandbookAssignee: Sven Vermeulen (RETIRED) <swift>
Status: RESOLVED FIXED    
Severity: enhancement CC: docs-team
Priority: Normal    
Version: unspecified   
Hardware: Sparc64   
OS: Linux   
Whiteboard:
Package list:
Runtime testing required: ---
Attachments: Relevant Gentoo news article

Description Vasyl Tretiakov 2013-03-27 13:00:45 UTC
Created attachment 343417 [details]
Relevant Gentoo news article

Section 7.b (topic Activating Required Options) does not mention that devtmpfs support is required for the current udev (197 and newer) operation.

I suggest adding the relevant requirement to section 7.b.

Device Drivers --->
  Generic Driver Options --->
    [*] Maintain a devtmpfs filesystem to mount at /dev
    [ ]   Automount devtmpfs at /dev, after the kernel mounted the rootfs
Comment 1 Samuli Suominen (RETIRED) gentoo-dev 2013-03-28 06:02:19 UTC
FYI, it's documented in http://www.gentoo.org/doc/en/udev-guide.xml plus warned about when you emerge udev's ebuild.
Comment 2 Samuli Suominen (RETIRED) gentoo-dev 2013-03-28 06:05:33 UTC
Oh! I found it to be also in the handbook here, both amd64 and x86. I don't know when it was added, but it's there.

http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?part=1&chap=7

Next select Maintain a devtmpfs file system to mount at /dev so that critical device files are already available early in the boot process.

Code Listing 2.3: Enabling devtmpfs support

Device Drivers --->
  Generic Driver Options --->
    [*] Maintain a devtmpfs filesystem to mount at /dev
Comment 3 Vasyl Tretiakov 2013-03-28 15:23:17 UTC
Handbooks for x86 and x64 mentioned a need to activate devtmpfs support in the kernel, because the corresponding stage3 contain udev version newer than 171.

I checked the current stage3 for Sparc and it indeed contains udev-171 which works fine without the mentioned option.

Hence, if there are no plans to update the Sparc stage3 to include udev newer than 171, my suggestion is irrelevant.
Comment 4 Sven Vermeulen (RETIRED) gentoo-dev 2013-04-06 08:02:56 UTC
It's not irrelevant. I'll take the udev stabilization as a guide and update those architectures that have udev-200 stable.
Comment 5 Sven Vermeulen (RETIRED) gentoo-dev 2013-04-06 08:06:18 UTC
Oh well, udev-197-r8 is stable for all others as well, so I guess it wont hurt for the others.
Comment 6 Sven Vermeulen (RETIRED) gentoo-dev 2013-04-06 08:10:21 UTC
Thanks, committed