Grub bug #12271

[Leon Lynch]

Hi all,

According to the following, Grub loads the Linux initrd at an address 
that is too high for the Linux kernel to access when the 'vmalloc=' boot 
parameter is set greater than 128M:

Grub bug #12271
http://lkml.org/lkml/2005/4/4/283

This appears to still be the case on Grub-0.97 that is shipped with 
Fedora Core 5.

My boot entry is:
title Fedora Core (2.6.16-prep)
        root (hd0,0)
        uppermem 524288
        kernel /vmlinuz-2.6.16-prep ro vmalloc=256M mem=1536M 
memmap=512M$1536M root=/dev/sda3
        initrd /initrd-2.6.16-prep.img

When I boot without 'uppermem 524288', Linux complains:
<snip>
initrd extends beyond end of memory (0x37fef49d > 0x2ffff000)
disabling initrd
</snip>

When I boot with 'uppermem 524288', Grub complains:
<snip>
root (hd0,0)
 Filesystem type is ext2fs, partition type 0x83
uppermem 524288
kernel /vmlinuz-2.6.16-prep ro vmalloc=256M mem=1536M memmap=512M$1536M 
root=/dev/sda3
   [Linux-bzImage, setup=0x1e00, size=0x187a4d]
initrd /initrd-2.6.16-prep.img
   [Linux-initrd @ 0x37f0c000, 0xe3d6e bytes]

Error 28: Selected item cannot fit into memory

Press any key to continue...
</snip>

Much googling indicated that many have tried and many have failed :-(. 
Applying a custom patch to Grub is not an option due to my client's lack 
of understanding anything. Is there a way to trick/manipulate Grub into 
loading the initrd at a lower address?

Thanx in advance,
Leon

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