Motherboard Porting Guide
The wiki is being retired!
Documentation is now handled by the same processes we use for code: Add something to the Documentation/ directory in the coreboot repo, and it will be rendered to https://doc.coreboot.org/. Contributions welcome!
Motherboard Porting Guide
Please note that this is WIP work.
HOWTO to find a way
- find a model and manufacturer of your mobo
- download these tools:
# git clone http://review.coreboot.org/p/coreboot # superiotool ( cd coreboot/util/superiotool ; make ; sudo make install ) # inteltool ( cd coreboot/util/inteltool ; make ; sudo make install ) # ectool ( cd coreboot/util/ectool ; make ; sudo make install ) # dmidecode ( cvs -z3 -d:pserver:email@example.com:/sources/dmidecode co dmidecode ) # msrtool ( cd coreboot/util/msrtool ; ./configure ; make ; sudo make install ) # nvramtool ( cd coreboot/util/nvramtool ; make ; sudo make install ) # flashrom ( svn co svn://coreboot.org/flashrom/trunk flashrom )
- make and install them (make; sudo make install) - you need at least libpci/pciutils
- check that your distro have this tools and install them:
# lspci # dmesg # acpitool # lspnp # lsusb
- Do this commands:
# lspci -nnvvvxxxx > lscpi.log # lspnp -vv > lspnp.log # lsusb -vvv > lsusb.log # superiotool -deV > superiotool.log # inteltool -a > inteltool.log # ectool > ectool.log # msrtool > msrtool.log # dmidecode > dmidecode.log # biosdecode > biosdecode.log # nvramtool -x > nvramtool.log # dmesg > dmesg.log # flashrom -V -p internal:laptop=force_I_want_a_brick > flashrom_info.log # flashrom -V -p internal:laptop=force_I_want_a_brick -r rom.bin > flashrom_read.log
- Save all logs in safe place, and also rom.bin file.
- Find what chip does your mobo use. The name of the chip is present in flashrom_info.log but is not always exact as some chips have several packaging variants (e.g. SOIC-16, SOIC-8 and TSOP). Consult [] for more info on possible chip formats. If possible make a high-resolution (600dpi or higher) scan of motherboard. Make a scan, not a photo as cameras typically don't have enough resolution to identify individual chips.
- try to find information - what EC (if on laptop) or Super I/O chip (if any) is used in your mobo (may be some info in Service Manuals or Disassembly guides)
- try to find your Super I/O / EC chip datasheet
For laptop, additionally:
- if you see that ectool return some fake staff - like only 'FF' or '00' - so you have custom EC configuration, it's a hard work for support
- if you see that ectool return looks like 'right' output - you have a big chances for support
- you need to find from thease outputs Super I/O / EC chip name, or if not see this - disassembly your laptop
Selecting Similar Board
Modifying existing board
Adding a new board
This is a two step process. If you mainboard already exists, skip to next section.
Adding a new vendor to tree
Create a directory in src/mainboard with the same name as vendor name. Add to src/mainboard/Kconfig new vendor entry, the rest of this example uses "foo" vendor.
config VENDOR_FOO bool "Foo"
Add also a include for new Kconfig file which holds the vendor motherboards in the vendor directory
Create a src/mainboard/foo/Kconfig, copy from other vendor, and change the vendor name. Delete all mainboards.
Adding a new motherboard to tree
Asume that vendor name is foo and board type is bar. Add new configuration item in src/mainboard/foo/Kconfig
config BOARD_FOO_BAR bool "BAR"
Add include for board specific config:
Adjusting contents of new board directory
Adjust Kconfig to fit the new vendor/model name and dont forget to change MAINBOARD_DIR and MAINBOARD_PART_NUMBER.