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diff --git a/zarb-ml/mageia-dev/2013-January/022162.html b/zarb-ml/mageia-dev/2013-January/022162.html new file mode 100644 index 000000000..ce8d1f332 --- /dev/null +++ b/zarb-ml/mageia-dev/2013-January/022162.html @@ -0,0 +1,121 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> +<HTML> + <HEAD> + <TITLE> [Mageia-dev] Grub2 vs. Grub Legacy in M3 + </TITLE> + <LINK REL="Index" HREF="index.html" > + <LINK REL="made" HREF="mailto:mageia-dev%40mageia.org?Subject=Re%3A%20%5BMageia-dev%5D%20Grub2%20vs.%20Grub%20Legacy%20in%20M3&In-Reply-To=%3C51070D6D.8050709%40zen.co.uk%3E"> + <META NAME="robots" CONTENT="index,nofollow"> + <META http-equiv="Content-Type" content="text/html; charset=us-ascii"> + <LINK REL="Previous" HREF="022150.html"> + <LINK REL="Next" HREF="022211.html"> + </HEAD> + <BODY BGCOLOR="#ffffff"> + <H1>[Mageia-dev] Grub2 vs. Grub Legacy in M3</H1> + <B>Barry Jackson</B> + <A HREF="mailto:mageia-dev%40mageia.org?Subject=Re%3A%20%5BMageia-dev%5D%20Grub2%20vs.%20Grub%20Legacy%20in%20M3&In-Reply-To=%3C51070D6D.8050709%40zen.co.uk%3E" + TITLE="[Mageia-dev] Grub2 vs. Grub Legacy in M3">zen25000 at zen.co.uk + </A><BR> + <I>Tue Jan 29 00:44:45 CET 2013</I> + <P><UL> + <LI>Previous message: <A HREF="022150.html">[Mageia-dev] Grub2 vs. Grub Legacy in M3 +</A></li> + <LI>Next message: <A HREF="022211.html">[Mageia-dev] Grub2 vs. Grub Legacy in M3 +</A></li> + <LI> <B>Messages sorted by:</B> + <a href="date.html#22162">[ date ]</a> + <a href="thread.html#22162">[ thread ]</a> + <a href="subject.html#22162">[ subject ]</a> + <a href="author.html#22162">[ author ]</a> + </LI> + </UL> + <HR> +<!--beginarticle--> +<PRE>On 28/01/13 20:09, Frank Griffin wrote: + +>><i> +</I>>><i> ...this is where we disagree slightly ;) +</I>>><i> Chainloading into grub2 is not the best way, due to the block lists +</I>>><i> problem people keep mentioning and complaining about. +</I>><i> +</I>><i> Could you please explain why ? The whole MBR/PBR design was set up so +</I>><i> that whatever gets loaded and receives control doesn't know which way it +</I>><i> happened. How does grub2 break this ? +</I>><i> +</I>My limited understanding is that the code in the 512 byte PBR has to use +block lists to find the core image in /boot, since it is too small to +understand filesystems. This is fragile in that filesystems and file +utilities may move files around on disk invalidating the block lists, +and for this reason the method is discouraged. + +A far as I know the same potential problem exists with grub legacy. + +Whether the same fragility applies to the multiboot approach I am not +sure, as documentation is sparse, however grub2 developers agree that it +is a valid method. + +>><i> Chanloading is un-necessary +</I>><i> +</I>><i> I don't claim that it's necessary, just that it's more desirable than +</I>><i> requiring the MBR code to go poking around in partitons other than the +</I>><i> one from which it was installed. If you're interested in keeping +</I>><i> partitions functionally as separate as they can be, it just makes sense +</I>><i> to have them booted by their own bootloaders. +</I>><i> +</I> +The MBR code cannot go poking around. It points to one location only. In +the case of grub2 this is normally a copy of core.img located in the +'MBR-gap' of around 31kB (or larger depending on partitioning) below the +start of the first sector. This then launches the boot menu for the +system that created it, or a dedicated grub installation. + +If the intention is to put the bootloader in the root partition by +whatever method, then it has no relation to the MBR. The intention is to +boot into the system's bootloader from another primary bootloader. + +The bootloader built into the core.img in the system root *is* it's own, +just as would be the case with chainloading, so I don't really see the +distinction. + +Barry + +</PRE> + + + + + + + + + + + + + + + + + + + +<!--endarticle--> + <HR> + <P><UL> + <!--threads--> + <LI>Previous message: <A HREF="022150.html">[Mageia-dev] Grub2 vs. Grub Legacy in M3 +</A></li> + <LI>Next message: <A HREF="022211.html">[Mageia-dev] Grub2 vs. Grub Legacy in M3 +</A></li> + <LI> <B>Messages sorted by:</B> + <a href="date.html#22162">[ date ]</a> + <a href="thread.html#22162">[ thread ]</a> + <a href="subject.html#22162">[ subject ]</a> + <a href="author.html#22162">[ author ]</a> + </LI> + </UL> + +<hr> +<a href="https://www.mageia.org/mailman/listinfo/mageia-dev">More information about the Mageia-dev +mailing list</a><br> +</body></html> |