Minnowboard:MinnowMaxCoreboot

NOTICE: This page is no longer being actively maintained here. Please refer to http://wiki.minnowboard.org/Coreboot for the latest information.

This page gives a step by step guide to building coreboot for the Minnowboard Max.

Requirements

• gcc
• g++
• git
• make
• ncurses-dev
• flex
• bison

Get sources and tools

NOTE: for simplicity, put all downloads and items extracted into the same directory.

Coreboot

git clone http://review.coreboot.org/p/coreboot
cd coreboot
git submodule update --init --checkout
git checkout 7effaa4c02d974b59bd86307a54cefb7bb046a3a

• Download config

Intel Firmware Support Package (FSP)

• Download:
  • Windows
  • Linux
  • Archive Links:
    • Intel® FSP for Intel® Atom™ Processor E3800 Series
• extract from archive
• follow instructions in Readme_Extract to extract FSP

Setup

TXE and SPI descriptor

First build a coreboot utility called ifdtool that's located within the coreboot directory

cd coreboot/util/ifdtool
make
cd ../../../

Download the original firmware binary here

unzip -d maxfirmware MinnowBoard.MAX_.X64.078.R02.bin_.zip
cd maxfirmware

Run ifdtool to extract the TXE and SPI descriptor from the firmware image

../coreboot/util/ifdtool/ifdtool -x MinnowBoard.MAX.X64.078.R02.bin

You should now have 4 files starting with flashregion_ Link flashregion_0_flashdescriptor.bin to descriptor.bin

ln -s flashregion_0_flashdescriptor.bin descriptor.bin

Link flashregion_1_bios.bin to txe.bin

ln -s flashregion_1_bios.bin txe.bin

• Ignore the other two flashregion files as they won't be used

Coreboot

cd coreboot

• in src/soc/intel/fsp_baytrail/Kconfig line 75, change default value of SMM_TSEG_SIZE from '0x100000' to '0x800000'

make menuconfig

• load provided config
• save config to .config
• If you have a single core Minnowboard Max, change "Mainboard" -> "Memory SKU to build" to 1GB

Building

make crossgcc-x64 crossgcc-i386
make

• The firmware produced is build/coreboot.rom

Building without TXE/SPI descriptor

make menuconfig

• Set Chipset -> Include the TXE to No

make crossgcc-x64 crossgcc-i386
make

• When flashing the firmware, only flash the last 3MB of the 8 MB image onto the last 3MB of the chip
  • Example command using flashrom and a dediprog: echo 00500000:007fffff coreboot > regions.txt ; sudo flashrom -p dediprog -l regions.txt -i coreboot -w coreboot.rom
• If you accidentally overwrite the first half, you will need to reflash the original firmware, which is available here.