Minnowboard:MinnowMaxCoreboot

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

Requirements

• gcc
• git
• make
• ncurses-dev

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 b9a0809faeeef67e46cda17cf8f7a839c6fe614c
• Download config

FSP

• Download FSP archive
• extract from archive
• follow instructions in Readme_Extract to extract FSP

Binary Configuration Tool

• Download BCT archive
• extract archive from archive
• extract from archive

TXE and SPI descriptor

Download the original firmware binary here http://elinux.org/Minnowboard:MinnowMaxCoreboot unzip

• cd coreboot
• ./build
• Not yet available. See Building without TXE/SPI descriptor section below for a possible workaround.

Setup

FSP

• cd bct
• ./bct --bin ../BAY_TRAIL_FSP_KIT/FSP/BAYTRAIL_FSP_GOLD_002_10-JANUARY-2014.fd --absf ../coreboot/src/vendorcode/intel/fsp/baytrail/absf/minnowmax_2gb.absf --bout ../minnowboard-max.fsp
  • If you have a single core Minnowboard Max, change minnowmax_2gb.absf to minnowmax_1gb.absf
  • DO NOT USE THE GUI. THE GUI DOES NOT WORK ON ALL LINUX DISTROS AND IS NOT NECESSARY FOR THIS.
• cd ..

Coreboot

• cd coreboot
• in src/soc/intel/fsp_baytrail/Kconfig line 127, change 'string' to 'string "ME PATH"'
• 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
• Set "Chipset" -> "ME PATH" to the directory containing TXE and SPI descriptor

Building

• make crossgcc
• make
• The firmware produced is build/coreboot.rom

Building without TXE/SPI descriptor

• make menuconfig
  • Set Chipset -> Include the TXE to No
• make crossgcc
• 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.