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Re: problem with grub configuration

From: Jeremy Katz
Subject: Re: problem with grub configuration
Date: 08 Feb 2002 15:40:46 -0500

On Fri, 2002-02-08 at 15:21, address@hidden wrote:
> Pavel Roskin <address@hidden> wrote:
> > GRUB loads initrd (initial reamdisk) to the end of the memory.  It uses
> > 256M of memory.  But you tell the kernel that you only have 254M of
> > memory.  That's why the kernel cannot load initrd.
> > 
> > initrd is used on RedHat to support SCSI adaptors.  If it cannot be 
> > loaded, then your SCSI devices are not accessible.
> > 
> > The best solution would be to recompile the kernel to support your SCSI 
> > adaptor in the kernel.  Besides, your kernel is old - consider applying 
> > all RedHat updates.
> Actually, an easier solution is to, instead of adding the "mem=254M"
> to the end of the kernel command-line, tell GRUB that it has less memory
> to work with, and it will report that to the kernel.
> Do this with the "uppermem" command, so instead of your entry looking
> like the following:
> ...so I *think* it would instead look like this:
> title Red Hat Linux (2.4.7-10smp)
>         uppermem 259072
>         root (hd0,0)
>         kernel /boot/vmlinuz-2.4.7-10smp ro root=/dev/sda1
>         initrd /boot/initrd-2.4.7-10smp.img

You also still need to pass mem= on the kernel command line if you go
this route.  Having grub pass its detected memory to the kernel by
default with a 2.4 kernel leads to problems due to not taking into
account any holes which you may have in your memory layout, thus is
disabled in the Red Hat Linux packages.



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