For building the 2.6 kernel
Take and read the following:
http://www.linux.org.uk/~davej/docs/...loween-2.6.txt
You need to get the module-init-tools.
Use lspci -v to help select your hardware. This will be helpful for configuring the 2.6 kernel.
make mrproper
make menuconfig
make
make modules_install
make install
Then modify you lilo.conf or grub.txt
make install installs vmlinuz into the boot directory along with System.map
It creates a symbolic link to you old vmlinuz -> vmlinuz.old and System.old
All you need to do is add entry for the old vmlinuz. I use lilo.conf
This is mine....
image=/boot/vmlinuz
label=Linux2.6
read-only
** This would be you redhat config. **
image=/boot/vmlinuz.old
vga=791
append="hdc=scsi hdd=scsi apm=power-off nomce"
label=Linux2.4
read-only
If you are using lilo, issue lilo -v or modify you menu.lst for grub.
Hope this helps. The more people use 2.6 the better.