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This is a note for upgrading Gentoo kernel 2.6.19-gentoo-r5 to 2.6.24-gentoo-r3

1. Reference http://www.gentoo.org/doc/en/kernel-upgrade.xml. Check if genkernel is installed. If not, install it
   # emerge -pv genkernel
2. Install the latest gentoo-sources
   # emerge gentoo-sources
3. Switch to the new kernel link
   # eselect  kernel list
   Available kernel symlink targets:
     [1]   linux-2.6.19-gentoo-r5 *
     [2]   linux-2.6.24-gentoo-r3
   # eselect kernel set 2
4. Reference http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?part=1&chap=7 to Compile and configure genkernel:
   #genkernel all
5. Check the created kernel image name and initrd
   # ls /boot/kernel* /boot/initramfs*
   We will need to know the image name and initrd in order to configure the grub.conf
6. Configure the grub.conf. Reference: http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?part=1&chap=10

   # vi /boot/grub/grub.conf
   Add the following lines to the top of the list:

   title=Gentoo Linux 2.6.19-gentoo-r3
   root (hd0,0)
   kernel /boot/kernel-genkernel-x86-2.6.24-gentoo-r3 root=/dev/ram0 init=/linuxrc ramdisk=8192 real_root=/dev/hda3 udev
   initrd /boot/initramfs-genkernel-x86-2.6.24-gentoo-r3

   Please pay attention to set the correct real_root to where your /root is.

   If you have SCSI devices, you should add doscsi as kernel option.

7. Reboot the system