2. Enabling SeaBIOS:
a. After changing to developer mode, configure Chrome OS so that you can log in.
To enable the legacy bios:
Open a crosh window with Ctrl+Alt+T.
Open a bash shell with the shell command.
Become superuser with sudo bash
Enable legacy boot with:
# crossystem dev_boot_usb=1 dev_boot_legacy=1
Reboot the machine
You can now start SeaBIOS by pressing Ctrl+L at the white boot splash screen.
3. Create Bootable USB using USBWriter
a. Plug the USB drive into the Chromebook, and start SeaBIOS with Ctrl+L at the white boot splash screen.
b. Press Esc to get a boot menu and select the number corresponding to your USB drive
4. Select Booting option press F1
Boot with Gentoo
5. Select Your Language
Default 41 is US, press Enter
6. Loading kernel modules
# modprobe ath9k
7. Set root password
# passwd
8. Gentoo WiFi connection
a. Know what is your Wireless device name
# ls /sys/class/net
expl “eht0 wlp1s0”
Create wpa.conf file in “/etc/wpa_supplicant/”
# nano /etc/wpa_supplicant/wpa.conf
i. Add in to file
ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=0
ap_scan=1
network={
ssid=”WIFI_Name”
psk=”WIFI_PASSWD”
priority=5
}
ctrl+x <y> enter
# ifconfig wlp1s0 up
# iwlist wlp1s0 scan | grep “Wifi-SSID”
# wpa_supplicant -Dwext -iwlp1so -c/etc/wpa_supplicant/wpa.conf
Press Ctrl+4 to quit
# ifconfig wlp1s0 up
Check net connection
# ping www.google.com
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9.Default partition scheme
# fdisk /dev/sda
a. Creating the BIOS boot partition <sda1>
Command (m for help): n
p primary partition (1-4): p
Partition number (1-4): 1
First sector (64-10486533532, default 64): 2048
Last sector, +sectors +size{M,K,G} : +2M
Mark the partition for EFI purposes:
Command (m for help): t
Selected partition 1
Hex code (type L to list codes): ef
Changed system type of partition 1 to ef (EFI (FAT-12/16/32))
b. Creating the boot partition <sda2>
Command (m for help): n
p primary partition (1-4): p
Partition number (2-4): 2
First sector : (Hit enter)
Last sector, +sectors +size{M,K,G} : +128M
Command (m for help): a
Selected partition 2
Hex code (type L to list codes): p
c. Creating the Swap Partition <sda3>
Command (m for help): n
p primary partition (1-4): p
Partition number (3-4): 3
First sector : (Hit enter)
Last sector, +sectors +size{M,K,G} : +512M
Command (m for help): t
Selected partition 3
Hex code (type L to list codes): 82
d. Creating the Root Partition <sda4>
Command (m for help): n
p primary partition (1-4): p
Partition number (4-4): 4
First sector : (Hit enter)
Last sector, +sectors +size{M,K,G} : (Hit enter)
e. Partition listing after creating the root partition
Command (m for help): p
Device Boot Start End Blocks Id System
/dev/sda1 1 3 5198+ ef EFI (FAT-12/16/32)
/dev/sda2 * 3 14 105808+ 83 Linux
/dev/sda3 15 81 506520 82 Linux swap
/dev/sda4 82 3876 28690200 83 Linux
f. Saving the Partition Layout
Command (m for help): w
10.Applying a filesystem on a partition
# mkfs.ext2 /dev/sda2
# mkfs.ext4 /dev/sda4
# mkswap /dev/sda3
# swapon /dev/sda3
11. Mounting Partition
# mount /dev/sda4 /mnt/gentoo
# mkdir /mnt/gentoo/boot
# mount /dev/sda2 /mnt/gentoo/boot
12. Using a Stage from the Internet: The next step you need to perform is to install the stage3 tarball onto your system. The command “uname -m” can be used to help you decide which stage file to download as it provides information on the architecture of your system.
a. Going to the Gentoo mountpoint
# cd /mnt/gentoo
# links http://www.gentoo.org/main/en/mirrors.xml
Select Download 
Select x86: iso stages
Select stage3-i686-20140128.tar.bz2.
Select one and press D to download. When you're finished, press Q to quit the browser.
Unpacking the stage
# tar xvjpf stage3-*.tar.bz2
13. Configuring the Compile Options
# nano -w /mnt/gentoo/etc/portage/make.conf
Add text in to file
USE="X dbus gtk gnome"
14. Copy DNS Info
# cp -L /etc/resolv.conf /mnt/gentoo/etc/
15. Mounting the necessary Filesystems
a. Mounting /proc and /dev
# mount -t proc proc /mnt/gentoo/proc
# mount --rbind /sys /mnt/gentoo/sys
# mount --rbind /dev /mnt/gentoo/dev
16. Entering the new Environment
a. Chrooting into the new environment
# chroot /mnt/gentoo /bin/bash
# source /etc/profile
# export PS1="(chroot) $PS1"
17. Installing a Portage Snapshot
a. # emerge-webrsync
18.Choosing the Right Profile.
# eselect profile list
Available profile symlink targets:
[1] default/linux/x86/13.0 *
[2] default/linux/x86/13.0/desktop
[3] default/linux/x86/13.0/desktop/gnome
[4] default/linux/x86/13.0/desktop/gnome/systemd
[5] default/linux/x86/13.0/desktop/kde
[6] default/linux/x86/13.0/desktop/kde/systemd
[7] default/linux/x86/13.0/developer
[8] default/linux/x86/
[9] default/linux/x86/selinux
# eselect profile set 4
19. Configuring the USE variable
a. Viewing available USE flags
# less /usr/portage/profiles/use.desc
(You can scroll using your arrow keys, exit by pressing 'q')
# nano -w /etc/portage/make.conf
Add USE="-qt4 -kde X dbus gtk gnome"
20. Timezone
# ls /usr/share/zoneinfo
(Suppose you want to use Asia/Kolkata)
# echo "Asia/Kolkata" > /etc/timezone
# emerge --config sys-libs/timezone-data
21. Configure locales
# nano -w /etc/locale.gen
i. en_US.UTF-8 UTF-8 <remove #>
# locale-gen
22.Displaying the available LANG settings
# eselect locale list
Available targets for the LANG variable:
[1] C
[2] POSIX
[3] en_US
[4] en_US.iso88591
[5] en_US.utf8
[6] de_DE
[7] de_DE.iso88591
[8] de_DE.iso885915
[9] de_DE.utf8
[ ] (free form)
# eselect locale set 3
23.Reload shell environment
# env-update && source /etc/profile
24. Installing a kernel source
# emerge gentoo-sources
25. Default: Manual Configuration
# cd /usr/src/linux
# make menuconfig
Processor type and features
[ ] 64-bit kernel (uncheck)
[*]Intel Low Power Subsystem Support
Processor family
(x)Pentium-II/Celeron(pre-Coppermine)
Device Drivers --->
Generic Driver Options --->
[*] Maintain a devtmpfs filesystem to mount at /dev
[ ] Automount devtmpfs at /dev, after the kernel mounted the rootfs
Network Device Support--->
[*] Wireless LAN (NEW)--->
[*] Atheros Wireless Cards --->
<M> Atheros 802.11n wireless cards support
i. Compiling the kernel
# make && make modules_install
ii. Installing the kernel
# cp arch/x86/boot/bzImage /boot/kernel-3.10.25-gentoo
iii. Viewing all available modules
# find /lib/modules/<kernel version>/ -type f -iname '*.o' -or -iname '*.ko' | less
26. Creating /etc/fstab
# nano -w /etc/fstab
/dev/sda2 /boot ext2 defaults,noatime 0 2
/dev/sda3 none swap sw 0 0
/dev/sda4 / ext4 noatime 0 1
/dev/cdrom /mnt/cdrom auto noauto,user 0 0
27. Setting the host name
# nano -w /etc/conf.d/hostname
a. hostname="ITWHOST" <edit your hostname>
28. Installing a system logger
# emerge syslog-ng
# rc-update add syslog-ng default
29. Installing dhcpcd
# emerge dhcpcd
30. Set root password
# passwd
31. Installing GRUB2
# emerge sys-boot/grub
# grub2-install /dev/sda
# grub2-mkconfig -o /boot/grub/grub.cfg
Generating grub.cfg ...
Found linux image: /boot/kernel-3.3.8-gentoo
Found initrd image: /boot/initramfs-genkernel-x86-3.3.8-gentoo
done
32. Install wpa_supplicant
# emerge net-wireless/wpa_supplicant
33. Rebooting your system: Exit the chrooted environment and unmount all mounted partitions. Then type in that one magical command you have been waiting for: reboot.
# exit
# umount -l /mnt/gentoo/dev{/shm,/pts,}
# umount -l /mnt/gentoo{/boot,/proc,}
# reboot
Congratulations, you’ve Successfully installed Gentoo on your Acer C720 Chromebook..!!! Kudos..!!!