Minnowboard:MinnowMaxCoreboot
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This page gives a step by step guide to building coreboot for the Minnowboard Max.
Contents
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:
- 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.