Minnowboard:MinnowMaxCoreboot

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 make menuconfig
 * in src/soc/intel/fsp_baytrail/Kconfig line 75, change default value of SMM_TSEG_SIZE from '0x100000' to '0x800000'
 * 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 make crossgcc-x64 crossgcc-i386 make
 * Set Chipset -> Include the TXE to No
 * 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.