Coreboot-15h

Coreboot-15h, also known as Mike's Coreboot, is a distribution of Coreboot for the ASUS KGPE-D16, developed by mrothfuss, focused on improving reliability and hardware compatibility over upstream Coreboot 4.11 and Dasharo 0.4.0. coreboot-15h includes changes for dramatically more stable memory initialization, significantly improved HyperTransport configuration, support for hardware monitoring and fan control, and patches to the build system to allow building on current Linux distributions. It is, at the time of writing, believed to be the most stable and complete Coreboot variant available for the hardware it targets.

History

As coreboot-D16, coreboot-15h was previously provided in two versions - coreboot-4.11 and coreboot-4.15. The former was based on upstream Coreboot 4.11, while the latter is based on Dasharo's KGPE-D16 port (an earlier out-of-tree effort to reintroduce KGPE-D16 support in Coreboot, ultimately not upstreamed), which is itself effectively a fork of Coreboot around the 4.15 release. Despite being based on an older version of Coreboot, the coreboot-4.11 version was more actively developed, was in much more widespread use, has seen significantly more testing, and was generally considered more stable and performant. The older coreboot-4.15 version can be found in the old GitHub repo.

coreboot-D16 also includes a modified version of fand.cpp, for use with OpenBMC, providing improved BMC-based fan control for KGPE-D16 users running OpenBMC. At present, you will need to manually replace this file in your OpenBMC source with the coreboot-D16 version before building OpenBMC in order to use it.

Compiling coreboot from source

Compilation has been tested on Debian 12 and FreeBSD 14.2. Building on FreeBSD is the same as building on Linux, but 'make' is replaced with 'gmake'.

Debian 12 Dependencies

apt install git build-essential m4 bison flex zlib1g-dev libncurses-dev imagemagick python-is-python3
 

FreeBSD 14.2 Dependencies

### This list may be incomplete
pkg install git gmake gcc12 m4 bison ImageMagick7  python
 

Configuring and Compiling

### Fetch coreboot-15h source
git clone https://git.15h.org/mrothfuss/coreboot-15h.git
cd coreboot-15h

### Optional: Fetch blobs (required for AMD microcode and VGABIOS)
### Both can be explicitly excluded from the build by menuconfig
git submodule update --init --checkout 3rdparty/blobs

### Optional: Fetch vboot (experimental TPM Measured boot support)
git submodule update --init --checkout 3rdparty/vboot

### Build the cross compiler (may take a while)
make crossgcc-i386 CPUS=$(nproc)

### Select a config template from ./configs
### These config files are used to compile the releases distributed on 15h.org
### 
### Copy the config you want to start with, you can adjust it in the next step
cp configs/config.supermicro_h8scm_seabios_ucode_matrox-oprom_vga-oproms .config

### Optional: Review or adjust your configuration
make menuconfig

### Build coreboot, your ROM will be at ./build/coreboot.rom
make

Switching Motherboards

If you want to switch motherboards, you must first clean the build environment. Afterwards, continue from the config selection step.

make distclean

Stable

ASUS KGPE-D16

Release	Notes	Download Options
2025.10.10-v4.11-a99acc20d4a	Initial v4.11 AGESA release Robust support for all DIMM slots up to 32GB RDIMMs supported up to 64GB LRDIMMs supported Up to 4 PCIe cards supported Native fan control Latest microcode IOMMU is disabled	SeaBIOS + uCode + VGA-OpROMs 2MB

SuperMicro H8SCM

Release	Notes	Download Options
2025.04.28-v4.11-34811b78c48	Fixed support for rev 1.02 motherboards Added support for UDIMM and LRDIMM memory Updated config RAM interleaving is only enabled for channels, not bank nor nodes	SeaBIOS + uCode + VGA-OpROMs 2MB
2025.03.08-v4.11-9f78cb25cd	Updated config Onboard VGA is no longer primary by default	SeaBIOS + uCode + VGA-OpROMs 2MB
2025.02.23-v4.11-583f5e6a34	Initial v4.11 AGESA release Microcode Updated Added fan control Various AGESA bugs fixed IOMMU is disabled	SeaBIOS + uCode + VGA-OpROMs 2MB

SuperMicro H8SGL

Release	Notes	Download Options
2025.09.15-v4.11-58cfb23a680	Initial release IOMMU is disabled	SeaBIOS + uCode + VGA-OpROMs 2MB

SuperMicro H8QGi+-F

Release	Notes	Download Options
2025.04.28-v4.11-34811b78c48	Added support for UDIMM and LRDIMM memory Updated config RAM interleaving is only enabled for channels, not bank nor nodes	SeaBIOS + uCode + VGA-OpROMs 2MB
2025.03.08-v4.11-9f78cb25cd	Updated config Onboard VGA is no longer primary by default	SeaBIOS + uCode + VGA-OpROMs 2MB
2025.02.25-v4.11-97011b87c1	Initial v4.11 AGESA release Microcode Updated Added fan control Various AGESA bugs fixed IOMMU is disabled	SeaBIOS + uCode + VGA-OpROMs 2MB

SuperMicro H8QG6+-F

Release	Notes	Download Options
2025.05.03-v4.11-6656887228f	Activated PCIe slots 1 and 3	SeaBIOS + uCode + VGA-OpROMs 2MB
2025.04.28-v4.11-34811b78c48	Added support for UDIMM and LRDIMM memory Updated config RAM interleaving is only enabled for channels, not bank nor nodes	SeaBIOS + uCode + VGA-OpROMs 2MB
2025.03.08-v4.11-9f78cb25cd	Updated config Onboard VGA is no longer primary by default	SeaBIOS + uCode + VGA-OpROMs 2MB
2025.02.25-v4.11-97011b87c1	Initial v4.11 AGESA release Microcode Updated Added fan control Enabled onboard SAS controller Various AGESA bugs fixed Northbridge 2 is offline IOMMU is disabled	SeaBIOS + uCode + VGA-OpROMs 2MB

Beta

ASUS F2A85-M

Release	Notes	Download Options
2025.03.08-v4.11-9f78cb25cd	Initial release Uses the existing AGESA 15TN codebase	SeaBIOS + uCode + XHCI-FW + VGA-OpROMs 8MB

ASUS F2A85-M PRO

Release	Notes	Download Options
2025.03.09-v4.11-1ca15f788b	Initial release Uses the existing AGESA 15TN codebase	SeaBIOS + uCode + XHCI-FW + VGA-OpROMs 8MB-UNTESTED

ASUS F2A85-M LE

Release	Notes	Download Options
2025.03.09-v4.11-1ca15f788b	Initial release Uses the existing AGESA 15TN codebase	SeaBIOS + uCode + XHCI-FW + VGA-OpROMs 8MB-UNTESTED

SuperMicro H8DGi

Release	Notes	Download Options
2025.05.03-v4.11-6656887228f	Initial support No fan control Northbridge 2 is offline IOMMU is disabled	SeaBIOS + uCode + VGA-OpROMs 2MB

SuperMicro H8DG6

Release	Notes	Download Options
2025.05.08-v4.11-7f9e8d15532	Initial support Onboard SAS enabled No fan control Northbridge 2 is offline IOMMU is disabled	SeaBIOS + uCode + VGA-OpROMs 2MB

Deprecated

ASUS KGPE-D16 (Raptor)

Release	Notes	Download Options
2025.03.08-v4.11-9f78cb25cd	Updated configs Sets default CMOS settings each boot Expanded CBFS for 16MB	SeaBIOS + uCode + VGA-OpROMs 16MB SeaBIOS + uCode 16MB SeaBIOS (blob-free) 16MB
2025.02.23-v4.11-583f5e6a34	Added fan control	SeaBIOS + uCode + VGA-OpROMs 2MB 16MB SeaBIOS + uCode 2MB 16MB SeaBIOS (blob-free) 2MB 16MB
2024.09.16-v4.11-d176edf4ae	Added more configuration variants Removed coreinfo as a secondary payload coreboot codebase unchanged	SeaBIOS + uCode + VGA-OpROMs 2MB 16MB SeaBIOS + uCode 2MB 16MB SeaBIOS (blob-free) 2MB 16MB
2024.09.14-v4.11-065549759c	Improved board stability Fixed bugs in RAM initialization code Fixed HyperTransport Deemphasis values	SeaBIOS + uCode + VGA-OpROMs 2MB 16MB