Comments on: Opening and modifying the initrd http://www.alexonlinux.com/opening-and-modifying-the-initrd Sun, 05 Feb 2012 21:17:46 +0000 hourly 1 http://wordpress.org/?v= By: he1ix' blog » Blog Archive » migrating RedHat/Fedora to a new/different LVM http://www.alexonlinux.com/opening-and-modifying-the-initrd/comment-page-1#comment-27882 he1ix' blog » Blog Archive » migrating RedHat/Fedora to a new/different LVM Fri, 09 Dec 2011 14:06:04 +0000 http://www.alexandersandler.net/?page_id=114#comment-27882 [...] alexonlinux.com mintojoseph.blogspot.com Tags: redhat, Server, Shell Category: Thoughts [...]<div class="comment-remix-meta"><a href="#" class="replyto" onclick="replyto('27882','he1ix' blog » Blog Archive » migrating RedHat\/Fedora to a new\/different LVM'); return false;">Reply</a> - <a href="#" class="quote" onclick="quote('27882','he1ix' blog » Blog Archive » migrating RedHat\/Fedora to a new\/different LVM','[...] alexonlinux.com mintojoseph.blogspot.com Tags: redhat, Server, Shell Category: Thoughts [...]'); return false;">Quote</a></div> [...] alexonlinux.com mintojoseph.blogspot.com Tags: redhat, Server, Shell Category: Thoughts [...]
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]]> By: Alexander Sandler http://www.alexonlinux.com/opening-and-modifying-the-initrd/comment-page-1#comment-24495 Alexander Sandler Sun, 14 Nov 2010 09:12:56 +0000 http://www.alexandersandler.net/?page_id=114#comment-24495 <a href='#comment-24443' rel="nofollow">@J05HYYY</a> Thanks. Please come again and bring all your friends along :-)<div class="comment-remix-meta"><a href="#" class="replyto" onclick="replyto('24495','Alexander Sandler'); return false;">Reply</a> - <a href="#" class="quote" onclick="quote('24495','Alexander Sandler','<a href=\'#comment-24443\' rel=\"nofollow\">@J05HYYY<\/a>\r\nThanks. Please come again and bring all your friends along :-)'); return false;">Quote</a></div> @J05HYYY
Thanks. Please come again and bring all your friends along :-)
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]]> By: J05HYYY http://www.alexonlinux.com/opening-and-modifying-the-initrd/comment-page-1#comment-24443 J05HYYY Mon, 01 Nov 2010 06:00:32 +0000 http://www.alexandersandler.net/?page_id=114#comment-24443 Brilliant article, helped loads. Cheers.<div class="comment-remix-meta"><a href="#" class="replyto" onclick="replyto('24443','J05HYYY'); return false;">Reply</a> - <a href="#" class="quote" onclick="quote('24443','J05HYYY','Brilliant article, helped loads. Cheers.'); return false;">Quote</a></div> Brilliant article, helped loads. Cheers.
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]]> By: Alexander Sandler http://www.alexonlinux.com/opening-and-modifying-the-initrd/comment-page-1#comment-23691 Alexander Sandler Sun, 24 Jan 2010 12:42:26 +0000 http://www.alexandersandler.net/?page_id=114#comment-23691 <a href='#comment-23688' rel="nofollow">@Aaditya</a> It is done by kernel.<div class="comment-remix-meta"><a href="#" class="replyto" onclick="replyto('23691','Alexander Sandler'); return false;">Reply</a> - <a href="#" class="quote" onclick="quote('23691','Alexander Sandler','<a href=\'#comment-23688\' rel=\"nofollow\">@Aaditya<\/a>\r\nIt is done by kernel.'); return false;">Quote</a></div> @Aaditya
It is done by kernel.
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]]> By: Aaditya http://www.alexonlinux.com/opening-and-modifying-the-initrd/comment-page-1#comment-23688 Aaditya Fri, 22 Jan 2010 18:51:47 +0000 http://www.alexandersandler.net/?page_id=114#comment-23688 Hi , Nice Article , I have one question. In my pc's distro (fc8), root=LABEL=/ is passed to kernel in grub.conf file. Now i am sure that this symbol LABEL is resolved by some programs in initrd ,because if i compile kernel with disk dirvers built in then It boots only if i supply say root=/dev/sda5 the LABEL thing dosent work ,BUT it works when the same kernel is booted with initrd. My question is that can u confirm that this resolving of LABEL is done by initrd and if yes then which program? Thanks<div class="comment-remix-meta"><a href="#" class="replyto" onclick="replyto('23688','Aaditya'); return false;">Reply</a> - <a href="#" class="quote" onclick="quote('23688','Aaditya','Hi ,\r\n Nice Article , I have one question.\r\n In my pc\'s distro (fc8), root=LABEL=\/ is passed to kernel in grub.conf\r\n file. Now i am sure that this symbol LABEL is resolved by some programs in initrd ,because if i compile kernel with disk dirvers built in then It boots only if i supply say root=\/dev\/sda5 the LABEL thing dosent work ,BUT it works when the same kernel is booted with initrd.\r\n\r\nMy question is that can u confirm that this resolving of LABEL is done by initrd \r\nand if yes then which program?\r\n\r\nThanks'); return false;">Quote</a></div> Hi ,
Nice Article , I have one question.
In my pc’s distro (fc8), root=LABEL=/ is passed to kernel in grub.conf
file. Now i am sure that this symbol LABEL is resolved by some programs in initrd ,because if i compile kernel with disk dirvers built in then It boots only if i supply say root=/dev/sda5 the LABEL thing dosent work ,BUT it works when the same kernel is booted with initrd.

My question is that can u confirm that this resolving of LABEL is done by initrd
and if yes then which program?

Thanks

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]]> By: pxe boot ubuntu and install from local network — matt vs world http://www.alexonlinux.com/opening-and-modifying-the-initrd/comment-page-1#comment-23635 pxe boot ubuntu and install from local network — matt vs world Mon, 11 Jan 2010 22:22:37 +0000 http://www.alexandersandler.net/?page_id=114#comment-23635 [...] http://www.alexonlinux.com/opening-and-modifying-the-initrd – Editing an initrd (I didn’t have to do this, but I found it interesting to pull an initrd apart and look at what’s inside) [...]
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]]> By: Alexander Sandler http://www.alexonlinux.com/opening-and-modifying-the-initrd/comment-page-1#comment-23591 Alexander Sandler Fri, 18 Dec 2009 20:40:08 +0000 http://www.alexandersandler.net/?page_id=114#comment-23591 Sure. But please visit again :-)<div class="comment-remix-meta"><a href="#" class="replyto" onclick="replyto('23591','Alexander Sandler'); return false;">Reply</a> - <a href="#" class="quote" onclick="quote('23591','Alexander Sandler','Sure. But please visit again :-)'); return false;">Quote</a></div> Sure. But please visit again :-)
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]]> By: petey http://www.alexonlinux.com/opening-and-modifying-the-initrd/comment-page-1#comment-23590 petey Thu, 17 Dec 2009 20:05:14 +0000 http://www.alexandersandler.net/?page_id=114#comment-23590 Thanks a lot! Great explanation!<div class="comment-remix-meta"><a href="#" class="replyto" onclick="replyto('23590','petey'); return false;">Reply</a> - <a href="#" class="quote" onclick="quote('23590','petey','Thanks a lot! Great explanation!'); return false;">Quote</a></div> Thanks a lot! Great explanation!
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]]> By: Alexander Sandler http://www.alexonlinux.com/opening-and-modifying-the-initrd/comment-page-1#comment-23412 Alexander Sandler Fri, 31 Jul 2009 09:00:47 +0000 http://www.alexandersandler.net/?page_id=114#comment-23412 <a href='#comment-23410' rel="nofollow">@bikao</a> It is simple. Kernel boots using BIOS. BIOS itself it capable of reading information from disks. Both loader and kernel use BIOS routines to access disks at early stage of the boot sequence. Loader doesn't know a thing about initrd. Kernel is the one who understands initrd and loads it into memory. It uses BIOS to do that. Once the initrd is in RAM, kernel switches the processor into so called protected mode. This enables multitasking and many other things, but breaks BIOS, which is, luckily, no longer needed at this stage of boot sequence.<div class="comment-remix-meta"><a href="#" class="replyto" onclick="replyto('23412','Alexander Sandler'); return false;">Reply</a> - <a href="#" class="quote" onclick="quote('23412','Alexander Sandler','<a href=\'#comment-23410\' rel=\"nofollow\">@bikao<\/a>\r\nIt is simple. Kernel boots using BIOS. BIOS itself it capable of reading information from disks. Both loader and kernel use BIOS routines to access disks at early stage of the boot sequence.\r\n\r\nLoader doesn\'t know a thing about initrd. Kernel is the one who understands initrd and loads it into memory. It uses BIOS to do that. Once the initrd is in RAM, kernel switches the processor into so called protected mode. This enables multitasking and many other things, but breaks BIOS, which is, luckily, no longer needed at this stage of boot sequence.'); return false;">Quote</a></div> @bikao
It is simple. Kernel boots using BIOS. BIOS itself it capable of reading information from disks. Both loader and kernel use BIOS routines to access disks at early stage of the boot sequence.

Loader doesn’t know a thing about initrd. Kernel is the one who understands initrd and loads it into memory. It uses BIOS to do that. Once the initrd is in RAM, kernel switches the processor into so called protected mode. This enables multitasking and many other things, but breaks BIOS, which is, luckily, no longer needed at this stage of boot sequence.

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]]> By: bikao http://www.alexonlinux.com/opening-and-modifying-the-initrd/comment-page-1#comment-23410 bikao Thu, 30 Jul 2009 19:48:49 +0000 http://www.alexandersandler.net/?page_id=114#comment-23410 Thank you! This article is very helpful. But I still don't understand one thing. If we don't have the drivers, how can the loader find the initrd in the disk. How does the loader knows the exact location of the initrd?<div class="comment-remix-meta"><a href="#" class="replyto" onclick="replyto('23410','bikao'); return false;">Reply</a> - <a href="#" class="quote" onclick="quote('23410','bikao','Thank you! This article is very helpful. But I still don\'t understand one thing. If we don\'t have the drivers, how can the loader find the initrd in the disk. How does the loader knows the exact location of the initrd?'); return false;">Quote</a></div> Thank you! This article is very helpful. But I still don’t understand one thing. If we don’t have the drivers, how can the loader find the initrd in the disk. How does the loader knows the exact location of the initrd?
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