Board:google/butterfly

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Revision as of 19:58, 3 December 2013 by MrNuke (talk | contribs) (Find the RO_VPD section)
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The wiki is being retired!

Documentation is now handled by the same processes we use for code: Add something to the Documentation/ directory in the coreboot repo, and it will be rendered to https://doc.coreboot.org/. Contributions welcome!

See Chromebooks for additional details.

Hi. I am the mighty alien dwarf, and I will be talking about the Pavilion Chromebook here.

Building a complete coreboot image (WHIP)

Including the MAC address and keyboard layout

The coreboot that ships with the laptop will read the keyboard layout and MAC address from the flash. Since ChromeOS uses a different layout than CBFS, the region containing these parameters must me included in the CBFS of the custom coreboot. There is a patch to allow coreboot to read this file and configure the hardware accordingly.

Get 'flashmap'

git clone https://chromium.googlesource.com/chromiumos/third_party/flashmap

Find the RO_VPD section

Build flashmap, then run fmap_decode on the extracted chromebook firmware.

fmap_decode original_chrome_image.rom

Locate the RO_VPD section in the output:

area_offset="0x00600000" area_size="0x00004000" area_name="RO_VPD" area_flags_raw="0x01" area_flags="static"

Extract the RO_VPD section from ROM image.

TODO!!! dd if=original_chrome_image.rom skip=??? bs=??? count=??? of=vpd.bin

Insert vpd.bin in the custom coreboot image:

TODO!!! cbfstool bla bla vpd.bin bla