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-4
votes
2answers
37 views

Why do applications launch faster when running entirely from a RAM disk?

What about running from a RAM disk makes applications launch faster when running entirely from a RAM disk?
1
vote
0answers
10 views

Using directory as initrd in QEMU

Is there a way to use a directory as initrd when booting QEMU? I know how to use the -kernel and -initrd flags for QEMU to boot a kernel and initrd without needing to first create a bootable device ...
0
votes
1answer
59 views

Merge a squashFS and a initrd into one single file (PXE booting)

I have a initrd and a cloop (squashFS). Which is the simplest way, to merge those 2 files into one single initrd file, for the purpose of PXE-booting the whole image at once without any bootstrapping ...
1
vote
2answers
87 views

initrd.img creation in installation cd

as you know, in Linux environments initrd is different for each hardware platform, for example in vm and actual hardware. for create initrd, must use mkinitrd command. but in installation cd ...
0
votes
1answer
33 views

Need To uncompress the initramfs file

I am new to this Linux Kernel and I am trying to boot a board from the usb and I was sucessfull Now My problem is the usb has two files a) initramfs.cpio.xz b) linux.img Now what I need to do ...
1
vote
1answer
30 views

Is it possible to reclaim the memory used by an initrd?

I'm developing a boot process for an embedded device. Currently I'm using an initrd (uncompressed it's 4 megs) to be able to setup my real root partition before continuing to boot (I have to select a ...
1
vote
1answer
2k views

How to boot into a root filesystem stored as partition image file on a bootable DVD?

I have created a bootable CD from a USB stick (built from Ubuntu core 12.04 according to this example) by copying the files of the USB stick's boot partition (containing vmlinuz and initrd.img) into ...
0
votes
1answer
31 views

building custom kernel on redhat 9

I'm trying to build a kernel 2.4 on redhat 9. but when I go through theses steps: make menuconfig make dep make bzImage make install they return no error but when I try to boot into it, it returns ...
0
votes
0answers
41 views

Kernel logs and Boot logs

I am trying to analyse the logs of whats happening during boot. Grub config My GRUB_CMDLINE_LINUX_DEFAULT option in /etc/default/grub reads GRUB_CMDLINE_LINUX_DEFAULT= dmesg I have analyzed my ...
1
vote
1answer
886 views

Can I make SYSLINUX load a root fs from an image file on an NTFS partition?

SYSLINUX allows me to boot from a FAT16 USB-stick by loading a kernel image and an initial ram-disk (initrd) image from there. To get more space and a faster access, I can mount an NTFS partition ...
11
votes
2answers
3k views

How easy is to crack the following copy protection? [closed]

I am trying to copyprotect some work, which is a bootable SD card booting a linux kernel on ARM device (Raspberry pi). I am using this approach: The approach uses an initrd to mount an encrypted ...
0
votes
1answer
171 views

How to transfer a USB bootable ubuntu system to a bootable DVD

I've built a USB bootable 1.5G system derived from Ubuntu core (along the lines of this example). It boots using syslinux on most of our Intel hardware. Intel iMacs are an exception (grub EFI with GPT ...
0
votes
1answer
391 views

linux kernel mount filesystem from the encrypt partition when boot,how to?

my sd card have two partition,one is the boot,and another is the filesystem,now I use linux tool cryptsetup encrypt the filesystem partition,when boot on my board,the kernel can't mount the ...
0
votes
2answers
608 views

GRUB2 UEFI booting from LVM on RAID (with XEN)

I'm experimenting with booting root filesystem from LVM volume inside the raid (mdraid superblock 1.x) via UEFI with GRUB2. Also I'm using Xen hypervisor. From grub command line I can see my lvm ...
1
vote
1answer
248 views

Reboot the system from an initrd without causing a kernel panic

i want to start a linux kernel over pxe boot, load a very small initram, do some jobs there and reboot the machine. so my init script looks like this: #!/bin/sh -e # used for initramfs export PATH . ...
1
vote
2answers
455 views

Linux kernel compiling: standalone OS

Hi guys I'm new to linux kernel compiling so I have some question: By compiling linux kernel are we building a totally standalone OS which doesn't depend on any linux destributions? If yes... Well ...
3
votes
3answers
364 views

PXELinux and compressed kernels/images

Is it possible to boot compressed kernels with a compressed initrd with PXELinux? First, a little background: We created a custom Linux distro, for diskless OpenCL computing nodes. We want those ...
2
votes
0answers
170 views

What does the linux kernel/initrd loading time depend on?

I recently updated my Linux kernel from 3.1.10 to 3.5.0. Upon booting with GRUB, I noticed that this kernel (or the initial ramdisk?) takes a much longer time to load (~5-6 s vs. ~1 s with the old ...
2
votes
1answer
8k views

How to build initrd without dmraid-driver on Ubuntu 9.10?

I would like to follow this piece of advice on mdadm Wikipedia article (to get mdadm & RAID working on my Karmic workstation): To solve this problem, you need to build a new initrd without ...
0
votes
2answers
912 views

Ubuntu apt-get upgrade breaks update-initramfs?

I ran apt-get upgrade on a Ubuntu 8.04 32-bit server. It upgraded lots of packages but failed here: Processing triggers for initramfs-tools ... update-initramfs: Generating ...
3
votes
1answer
2k views

Possible to boot Linux kernel without initrd?

Is it possible to boot a Linux kernel (say 2.6.35) without initrd these days? I seem to remember that this is possible before (early 2.6.x and 2.4). I mean, in theory, if a kernel has all hardware ...
1
vote
1answer
401 views

what user/group are init.d scripts launched as?

Maybe i got the title wrong so correct me if it is On system bootup i get the error spawn-fcgi: opening PID-file '/var/run/php-fastcgi/php-fastcgi.pid' failed: Permission denied What permission ...
1
vote
0answers
84 views

rescue Ubuntu 11.04 from overwritten system files

I accidentaly extracted an ArchLinux initrd to / . Now the system won't boot anymore. How do I reinstall the overwritten system files? Can I use an apt-command for this? I still can chroot into the ...
3
votes
1answer
1k views

Extracting init script from bult-in intrfs into Linux bzImage

I have following problem - I damaged my system (Gentoo - by rebuilding using gcc 4.5) beyond repair. I unmounted /home, copied /etc + other important files and I've started reinstalling system. ...
1
vote
2answers
4k views

What does “mounting a root file system” exactly means?

In the boot process of Linux we have the initrd that is a root file system and is mounted before the real root file system become ready to mount. What is the procedure of mounting? What should happen ...
0
votes
2answers
2k views

skip init scripts - boot freezes at “setting system clock”

I have a debian system that's freezing in the boot sequence at "Setting system clock". Several sites I looked at recommended changing the init scripts to disallow hardware access to the clock. But, I ...