How to make the legacy SeaBIOS firmware slot the default on a Haswell/Broadwell based Chromebook

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 […]