Minnowboard:MinnowMaxCoreboot

From eLinux.org
Revision as of 08:46, 27 February 2015 by Warthog9 (talk | contribs)
Jump to: navigation, search

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

Requirements

  • gcc
  • 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 b9a0809faeeef67e46cda17cf8f7a839c6fe614c

FSP

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

Binary Configuration Tool

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

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 ..

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 2014-WW42.4-MinnowBoardMax.73-64-bit.bin_Release.zip
cd maxfirmware

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

../coreboot/util/ifdtool/ifdtool -x MNW2MAX1.X64.0073.R02.1409160934.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 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(../maxfirmware)

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.