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Published on March 12th, 2014 | by admin

How to make Seabios default on Acer C720




This new has just came to our attention, you don’t need anymore to use Ctrl + L to boot in to your Linux distro.

Divulged this evening by Duncan Laurie on the coreboot mailing list:

If you want to boot SeaBIOS by default and you have unlocked the SPI flash write protection you can set flags in the (write protected) “GBB” flash region that will make it boot legacy mode by default.

In Chrome OS there is a script called set_gbb_flags.sh that will do this for you. Run the script with no arguments to get a list of possible flags and then to enable short dev mode screen (1 second timeout) followed by default legacy mode boot you could use these flags:

GBB_FLAG_DEV_SCREEN_SHORT_DELAY 0×00000001
GBB_FLAG_FORCE_DEV_SWITCH_ON 0×00000008
GBB_FLAG_FORCE_DEV_BOOT_LEGACY 0×00000080
GBB_FLAG_DEFAULT_DEV_BOOT_LEGACY 0×00000400

set_gbb_flags.sh 0×489

 

Give it a try and let us know!

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5 Responses to How to make Seabios default on Acer C720

  1. plovesee says:

    Is there a way to make SeaBios the default with in the linux side of things? I got a little hasty and compleatly removed my chrome os partiotion to make room for Xubuntu and any storage I could get out of the 16 GB SSD. Am I just going to have to re-install chrome os, removing Xubuntu in the process, and making Seabios the default from there? Also, if I do that and then remove chrome os again will it revert back to staying on the splash screen and defaulting to chrome os?

    • admin says:

      Hello plovesee, i’m afraid so! Personally I haven’t tried. You can find my tutorial 1/3 and thats exactly how I made it. Have you tried to run chromium from a usb disk and perform this steps?

  2. Gooplusplus says:

    As a soon-to-be owner of a basic Acer C720 Chromebook, what is advantage of doing this? Do you do this before or after installing Crouton? What does the screen look like when you first boot up after doing this procedure?

    I would like to be able to install a musician-friendly XFCE-based distro like UbuntuStudio 14.04 (or KDE-based KXStudio 14.04) on a USB 3.0 flash drive using Crouton while still having ChromeOS on SSD as my default OS.

    Is this possible or should I start with an older software version?

    Any guidance, links, etc. would be most helpful.

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