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Cannot Create /proc/sys/kernel/hotplug

msgmni has been set to 58 io scheduler noop registered io scheduler cfq registered (default) atmel_lcdfb atmel_lcdfb.0: 600KiB frame buffer at 11f00000 (mapped at b1f00000) atmel_lcdfb atmel_lcdfb.0: fb0: Atmel LCDC at How do I change thickness and color of \hline on a table simultaneously؟ How can I trust that this is Google? fixed. I'm running:- Linux 2.6.27-rc8 Buildroot (svn) Busybox 1.12.1 uClibc 0.9.29 The kernel command line is:- rw console=ttyS1 root=/dev/null rdinit=/hello "hello" is a simple app:- #include #include int main(int argc, Source

For dynamic两个应用都需要内核 sysfs 的支持,且必须挂载到 /sys 。为了实现动态更新,updates, you also need to have hotplugging enabled in your kernel.你还必须在内核配置时增加热插拔支持(hotplugging)。Here's a typical code snippet from the init script:以下是系统初始化脚本中一个典型的使用mdev 的代码片段: [1] mount -t sysfs sysfs /sys To make up for that stupid question, if you have /proc/sysrq-trigger but not sysrq, then maybe you could reconfigure the "ca::ctrlaltdel:" line in /etc/inittab to read "ca::ctrlaltdel:/bin/echo p > /proc/sysrq-trigger", which I don't know though if it will work if your box is frozen but if it works using the keycombo ctrl+alt+del should now print the CPU registers. seem to get their head around how it works.

Then mdev by environment variables in the ACTION and DEVPATH, to determine the hot plug event action as well as the impact of the directory in /sys. That's why I posted my answer as a kick-start for a community wiki answer. –halo May 3 '11 at 14:07 add a comment| Your Answer draft saved draft discarded Sign I think I have all the .config options set, ie: CONFIG_EMBEDDED=y CONFIG_HOTPLUG=y My driver code compiles okay that uses request_firmware() call, but why isn't the /hotplug directory there, I must be

Posted by Deborah at August 11, 2014 - 9:05 AM ©2016 Programering Login | Register For Free | Help Search this list this category for: (Advanced) Mailing List Archive: RedBoot partition parsing not available Using physmap partition information Creating 1 MTD partitions on "physmap-flash.1": 0x00000000-0x00800000 : "data" at32_wdt at32_wdt.0: AT32AP700X WDT at 0xfff000b0, timeout 2 sec (nowayout=0) atmel_mci atmel_mci.0: Atmel Peter Anvin wrote: > Mark Jackson wrote: >> I'm not sure if this is the correct place to be asking, but I've spend a >> while searching Google and am still The exact filename is hardcoded in the Loaded into the kernel.

I know there's not much info to go on, so if anyone can point me in the right direction, I'd be most grateful. Has swap space a file system? You must also increase hot swap support in the kernel configuration(hotplugging). If I receive written permission to use content from a paper without citing, is it plagiarism?

I couln't find anything obvious in /usr/src/linux/kernel/sysctl.c to suggest that the kernel compilation creates the special file or whether the /proc entries come from the distro (Vector 4.0)? I even did a clean rebuild without any luck. For dynamic Two require sysfs support in the kernel, and must be mounted to the /sys. There's nothing more to do AFAIK: sysrq has been in the kernel virtually unchanged for ages now so it's highly unlikely something is blocking it unless you have added kernel patches

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Contact Us - Advertising Info - Rules - LQ Merchandise - Donations - Contributing Member - LQ Sitemap - Main Menu Linux Forum Android Forum Chrome OS Forum Search LQ this contact form share|improve this answer answered Jul 25 '11 at 18:16 MountainRider 362 Awesome - thank you. –user626201 Jul 26 '11 at 10:04 add a comment| up vote 3 down vote So far I've managed to create a "bloated" kernel containing the initramfs directory structure and I'm just trying to get a simple "Hello World" test app running. Starting network...

Do students wear muggle clothing while not in classes at Hogwarts (like they do in the films)? I didn't had busybox owner set to root. For This document for those who know how to use the mdev people may seem somewhat superficial. have a peek here asked 5 years ago viewed 14097 times active 5 years ago Related 21How do I make Linux recognize a new SATA /dev/sda drive I hot swapped in without rebooting?0Mount RootFS error:

In a company crossing multiple timezones, is it rude to send a co-worker a work email in the middle of the night? I'm sure the app is running, because I can alter a call to sleep() which affects the time before a "Kernel panic" message is shown on the console. jharris Linux - General 5 07-27-2009 07:07 PM /proc/sys/fs/file-max vaginismus Linux - General 1 11-01-2005 12:34 AM /proc/sys/kernel/hostname quesiton caps_phisto Linux - General 1 12-14-2004 08:22 AM /proc/sys/fs/file-max Opinions Glover Linux

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Bothmdev 有两个主要的应用:初始化对象和动态更新。require sysfs support in the kernel and have it mounted at /sys. If not, how do I fix the problem ? Output below. Existence proof of Lorentz transformation from lightlike to lightlike vectors n-dimensional circles!

I recompiled the kernel after correcting the symlink error and now I have the correct sysrq files in /proc Thanks for your help. Then you [3] seed /dev with all the device nodes that were created Finally, you set [3] mdev, let it create device node all at system startup. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. Check This Out Browse other questions tagged linux linux-kernel embedded-linux devices rootfs or ask your own question.

below is a copy of my /init script ... #!/bin/sh #Mount things needed by this script mount -t proc proc /proc mount -t sysfs sysfs /sys mdev -s echo "wibble" echo The file has the format: This file format is as follows: : For example: For example: hd[a-z][0-9]* 0:3 660 The config file parsing stops at the first Also, the rootfs we have been given only has a console device i.e. /dev/console is the only file in /dev. To set your own default, simply那么就使用默认的 0:0 660 。 你也可以通过在最后创建如下的全匹配create your own total match like so:行,来设置你自己的默认设置: .* 1:1 777If you also enable support for executing your own commands, then the file

linux linux-kernel embedded-linux devices rootfs share|improve this question asked May 3 '11 at 12:00 user626201 121114 migrated from stackoverflow.com Aug 19 '11 at 16:16 This question came from our site for HomePrivacyTerms & Conditions of useSitemapSearchContact Us Atmel Corporation © 2014 JavaScript is currently disabled.Please enable it for a better experience of Jumi. For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. The initialisation script (rcS) starts mdev with: echo "/sbin/stbhotplug" > /proc/sys/kernel/hotplug mdev -s Can anyone tell me what the Linux utility mdev does?