mainboard: Add ASRock H81M-HDS

Tested with GRUB 2.02 as a payload, booting Debian GNU/Linux 9.5 with
kernel 4.9.

This board works quite well under coreboot. A list of what works and
what doesn't can be found in the documentation part of this commit.

The file `data.vbt` matches the VBT in the latest stable version of the
vendor firmware (version 2.20).

Change-Id: I53483bb9fa335e86e85dfc487fef03fce4b85e2a
Signed-off-by: Tristan Corrick <tristan@corrick.kiwi>
Reviewed-on: https://review.coreboot.org/29390
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
diff --git a/Documentation/mainboard/asrock/h81m-hds.md b/Documentation/mainboard/asrock/h81m-hds.md
new file mode 100644
index 0000000..0338aa1
--- /dev/null
+++ b/Documentation/mainboard/asrock/h81m-hds.md
@@ -0,0 +1,146 @@
+# ASRock H81M-HDS
+
+This page describes how to run coreboot on the [ASRock H81M-HDS].
+
+## Required proprietary blobs
+
+This board currently requires a proprietary blob in order to initialise
+the RAM and a few other components. The blob largely consists of Intel's
+Memory Reference Code (shortened to mrc), and is just under 200 KiB
+in size. It is also known as a system agent binary. Unfortunately,
+it is not currently possible to distribute this as part of coreboot.
+However, the mrc can be obtained from a Haswell Chromebook firmware
+image, and you might find one online. The mrc from a ChromeOS image can
+be extracted with the following command. If extracting from a "standard"
+coreboot image, omit `-r RO_SECTION`.
+
+```bash
+cbfstool coreboot.rom extract -f mrc.bin -n mrc.bin -r RO_SECTION
+```
+
+Now, place mrc.bin in the root of the coreboot directory.
+Alternatively, place it anywhere you want, and set `MRC_FILE` to its
+location when building coreboot.
+
+## Building coreboot
+
+A fully working image should be possible just by setting your MAC
+address and obtaining the Haswell mrc. You can set the basic config
+with the following commands. However, it is strongly advised to use
+`make menuconfig` afterwards (or instead), so that you can see all of
+the settings.
+
+```bash
+make distclean # Note: this will remove your current config, if it exists.
+touch .config
+./util/scripts/config --enable VENDOR_ASROCK
+./util/scripts/config --enable BOARD_ASROCK_H81M_HDS
+./util/scripts/config --enable HAVE_MRC
+./util/scripts/config --set-str REALTEK_8168_MACADDRESS "xx:xx:xx:xx:xx:xx" # Fill this in!
+make olddefconfig
+```
+
+If you don't plan on using coreboot's serial console to collect logs,
+you might want to disable it at this point (`./util/scripts/config
+--disable CONSOLE_SERIAL`). It should reduce the boot time by several
+seconds. However, a more flexible method is to change the console log
+level from within an OS using `util/nvramtool`, or with the `nvramcui`
+payload.
+
+Now, run `make` to build the coreboot image.
+
+## Flashing coreboot
+
+### Internal programming
+
+The main SPI flash can be accessed using [flashrom]. By default, only
+the BIOS region of the flash is writable. If you wish to change any
+other region, such as the Management Engine or firmware descriptor, then
+an external programmer is required (unless you find a clever way around
+the flash protection).
+
+The following command may be used to flash coreboot:
+
+```bash
+sudo flashrom -p internal --ifd -i bios --noverify-all -w coreboot.rom
+```
+
+The use of `--noverify-all` is required since the Management Engine
+region is not readable even by the host.
+
+### External programming
+
+The flash chip is a 4 MiB socketed DIP-8 chip. Specifically, it's a
+Winbond W25Q32FV, whose datasheet can be found [here][W25Q32FV].
+The chip is located to the bottom right-hand side of the board. For
+a precise location, refer to section 1.4 (Motherboard Layout) of the
+[board manual], where the chip is labelled "32Mb BIOS". Take note of
+the chip's orientation, remove it from its socket, and flash it with
+an external programmer. For reference, the notch in the chip should be
+facing towards the bottom of the board.
+
+## Known issues
+
+- PCIe graphics is non-functional. The PCIe 16x slot doesn't work
+  with other devices, either.
+
+- The VGA port doesn't work until the OS reinitialises the display.
+
+- There is no automatic, OS-independent fan control. This is because
+  the super I/O hardware monitor can only obtain valid CPU temperature
+  readings from the PECI agent, but the required driver doesn't exist
+  in coreboot. The `coretemp` driver can still be used for accurate CPU
+  temperature readings from an OS.
+
+## Untested
+
+- parallel port
+- PS/2 keyboard
+- EHCI debug
+- TPM
+- infrared module
+- chassis intrusion header
+- chassis speaker header
+
+## Working
+
+- USB
+- S3 suspend/resume
+- Gigabit Ethernet
+- integrated graphics
+- PCIe (but not the 16x slot, see [Known issues](#known-issues))
+- SATA
+- PS/2 mouse
+- serial port
+- hardware monitor (see [Known issues](#known-issues))
+- onboard audio
+- front panel audio
+- initialisation with Haswell mrc version 1.6.1 build 2
+- graphics init with libgfxinit (see [Known issues](#known-issues))
+- flashrom under the vendor firmware
+- flashrom under coreboot
+- Wake-on-LAN
+- Using `me_cleaner`
+
+## Technology
+
+```eval_rst
++------------------+--------------------------------------------------+
+| Northbridge      | Intel Haswell                                    |
++------------------+--------------------------------------------------+
+| Southbridge      | Intel Lynx Point (H81)                           |
++------------------+--------------------------------------------------+
+| CPU              | Intel Haswell (LGA1150)                          |
++------------------+--------------------------------------------------+
+| Super I/O        | Nuvoton NCT6776                                  |
++------------------+--------------------------------------------------+
+| EC               | None                                             |
++------------------+--------------------------------------------------+
+| Coprocessor      | Intel Management Engine                          |
++------------------+--------------------------------------------------+
+```
+
+[ASRock H81M-HDS]: https://www.asrock.com/mb/Intel/H81M-HDS/
+[W25Q32FV]: https://www.winbond.com/resource-files/w25q32fv%20revi%2010202015.pdf
+[flashrom]: https://flashrom.org/Flashrom
+[Board manual]: http://asrock.pc.cdn.bitgravity.com/Manual/H81M-HDS.pdf
diff --git a/Documentation/mainboard/index.md b/Documentation/mainboard/index.md
index c1e5262..4383582 100644
--- a/Documentation/mainboard/index.md
+++ b/Documentation/mainboard/index.md
@@ -6,6 +6,10 @@
 
 - [P8H61-M LX](asus/p8h61-m_lx.md)
 
+## ASRock
+
+- [H81M-HDS](asrock/h81m-hds.md)
+
 ## Cavium
 
 - [CN81XX EVB SFF](cavium/cn8100_sff_evb.md)
diff --git a/src/mainboard/asrock/h81m-hds/Kconfig b/src/mainboard/asrock/h81m-hds/Kconfig
new file mode 100644
index 0000000..f93fcdb
--- /dev/null
+++ b/src/mainboard/asrock/h81m-hds/Kconfig
@@ -0,0 +1,89 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2018 Tristan Corrick <tristan@corrick.kiwi>
+##
+## This program is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 2 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+
+if BOARD_ASROCK_H81M_HDS
+
+config BOARD_SPECIFIC_OPTIONS
+	def_bool y
+	select BOARD_ROMSIZE_KB_4096
+	select CPU_INTEL_HASWELL
+	select HAVE_ACPI_RESUME
+	select HAVE_ACPI_TABLES
+	select HAVE_OPTION_TABLE
+	select HAVE_CMOS_DEFAULT
+	select HAVE_SMI_HANDLER
+	select INTEL_GMA_HAVE_VBT
+	select INTEL_INT15
+	select MAINBOARD_HAS_LIBGFXINIT
+	select NORTHBRIDGE_INTEL_HASWELL
+	select REALTEK_8168_RESET
+	select RT8168_SET_LED_MODE
+	select SERIRQ_CONTINUOUS_MODE
+	select SOUTHBRIDGE_INTEL_LYNXPOINT
+	select SUPERIO_NUVOTON_NCT6776
+	select SUPERIO_NUVOTON_NCT6776_COM_A
+	select TSC_MONOTONIC_TIMER
+
+config CBFS_SIZE
+	hex
+	default 0x200000
+
+#
+# The override of GFX_GMA_CPU_VARIANT should be removed once the patches
+# for dynamic CPU detection are merged in libgfxinit.
+#
+config GFX_GMA_CPU_VARIANT
+	string
+	default "Normal"
+
+config MAINBOARD_DIR
+	string
+	default asrock/h81m-hds
+
+config MAINBOARD_PART_NUMBER
+	string
+	default "H81M-HDS"
+
+config MAINBOARD_PCI_SUBSYSTEM_DEVICE_ID
+	hex
+	default 0x8c5c
+
+config MAINBOARD_PCI_SUBSYSTEM_VENDOR_ID
+	hex
+	default 0x1849
+
+# This is overridden if CMOS is used for configuration values.
+config MAINBOARD_POWER_ON_AFTER_POWER_FAIL
+	bool
+	default n
+
+config MAX_CPUS
+	int
+	default 8
+
+config MMCONF_BASE_ADDRESS
+	hex
+	default 0xf0000000
+
+#
+# Since this is a desktop board, the assumption is made that most users
+# would want CMOS configuration enabled by default.
+#
+config USE_OPTION_TABLE
+	bool
+	default y
+
+endif
diff --git a/src/mainboard/asrock/h81m-hds/Kconfig.name b/src/mainboard/asrock/h81m-hds/Kconfig.name
new file mode 100644
index 0000000..4e4de82
--- /dev/null
+++ b/src/mainboard/asrock/h81m-hds/Kconfig.name
@@ -0,0 +1,2 @@
+config BOARD_ASROCK_H81M_HDS
+	bool "H81M-HDS"
diff --git a/src/mainboard/asrock/h81m-hds/Makefile.inc b/src/mainboard/asrock/h81m-hds/Makefile.inc
new file mode 100644
index 0000000..94bd1cfe
--- /dev/null
+++ b/src/mainboard/asrock/h81m-hds/Makefile.inc
@@ -0,0 +1,17 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2018 Tristan Corrick <tristan@corrick.kiwi>
+##
+## This program is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 2 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+
+ramstage-$(CONFIG_MAINBOARD_USE_LIBGFXINIT) += gma-mainboard.ads
diff --git a/src/mainboard/asrock/h81m-hds/acpi/ec.asl b/src/mainboard/asrock/h81m-hds/acpi/ec.asl
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/mainboard/asrock/h81m-hds/acpi/ec.asl
diff --git a/src/mainboard/asrock/h81m-hds/acpi/platform.asl b/src/mainboard/asrock/h81m-hds/acpi/platform.asl
new file mode 100644
index 0000000..adaf51a
--- /dev/null
+++ b/src/mainboard/asrock/h81m-hds/acpi/platform.asl
@@ -0,0 +1,24 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 Tristan Corrick <tristan@corrick.kiwi>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+Method(_WAK, 1)
+{
+	Return (Package() { 0, 0 })
+}
+
+Method(_PTS, 1)
+{
+}
diff --git a/src/mainboard/asrock/h81m-hds/acpi/superio.asl b/src/mainboard/asrock/h81m-hds/acpi/superio.asl
new file mode 100644
index 0000000..b671e3c
--- /dev/null
+++ b/src/mainboard/asrock/h81m-hds/acpi/superio.asl
@@ -0,0 +1,26 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018 Tristan Corrick <tristan@corrick.kiwi>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#define SUPERIO_DEV		SIO0
+#define SUPERIO_PNP_BASE	0x2e
+#define NCT6776_SHOW_PP
+#define NCT6776_SHOW_SP1
+#define NCT6776_SHOW_KBC
+#define NCT6776_SHOW_HWM
+
+#undef NCT6776_SHOW_GPIO
+
+#include <superio/nuvoton/nct6776/acpi/superio.asl>
diff --git a/src/mainboard/asrock/h81m-hds/acpi_tables.c b/src/mainboard/asrock/h81m-hds/acpi_tables.c
new file mode 100644
index 0000000..a43b4990
--- /dev/null
+++ b/src/mainboard/asrock/h81m-hds/acpi_tables.c
@@ -0,0 +1,21 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018 Tristan Corrick <tristan@corrick.kiwi>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <southbridge/intel/lynxpoint/nvs.h>
+
+void acpi_create_gnvs(global_nvs_t *gnvs)
+{
+}
diff --git a/src/mainboard/asrock/h81m-hds/board_info.txt b/src/mainboard/asrock/h81m-hds/board_info.txt
new file mode 100644
index 0000000..56ad1b4
--- /dev/null
+++ b/src/mainboard/asrock/h81m-hds/board_info.txt
@@ -0,0 +1,7 @@
+Category: desktop
+Board URL: https://www.asrock.com/mb/Intel/H81M-HDS/
+ROM package: DIP-8
+ROM protocol: SPI
+ROM socketed: y
+Flashrom support: y
+Release year: 2013
diff --git a/src/mainboard/asrock/h81m-hds/cmos.default b/src/mainboard/asrock/h81m-hds/cmos.default
new file mode 100644
index 0000000..c51001c
--- /dev/null
+++ b/src/mainboard/asrock/h81m-hds/cmos.default
@@ -0,0 +1,4 @@
+boot_option=Fallback
+debug_level=Debug
+nmi=Enable
+power_on_after_fail=Disable
diff --git a/src/mainboard/asrock/h81m-hds/cmos.layout b/src/mainboard/asrock/h81m-hds/cmos.layout
new file mode 100644
index 0000000..c7947f7
--- /dev/null
+++ b/src/mainboard/asrock/h81m-hds/cmos.layout
@@ -0,0 +1,90 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2007-2008 coresystems GmbH
+## Copyright (C) 2014 Vladimir Serbinenko
+##
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation; version 2 of the License.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+
+# -----------------------------------------------------------------
+entries
+
+# -----------------------------------------------------------------
+# Status Register A
+# -----------------------------------------------------------------
+# Status Register B
+# -----------------------------------------------------------------
+# Status Register C
+#96           4       r       0        status_c_rsvd
+#100          1       r       0        uf_flag
+#101          1       r       0        af_flag
+#102          1       r       0        pf_flag
+#103          1       r       0        irqf_flag
+# -----------------------------------------------------------------
+# Status Register D
+#104          7       r       0        status_d_rsvd
+#111          1       r       0        valid_cmos_ram
+# -----------------------------------------------------------------
+# Diagnostic Status Register
+#112          8       r       0        diag_rsvd1
+
+# -----------------------------------------------------------------
+0            120     r       0        reserved_memory
+#120          264     r       0        unused
+
+# -----------------------------------------------------------------
+# RTC_BOOT_BYTE (coreboot hardcoded)
+384          1       e       3        boot_option
+388          4       h       0        reboot_counter
+
+# -----------------------------------------------------------------
+# coreboot config options: console
+#392          3       r       0        unused
+395          4       e       4        debug_level
+#399          1       r       0        unused
+
+#400         8       r       0        reserved for century byte
+
+# coreboot config options: southbridge
+408          1       e       1        nmi
+409          2       e       1        power_on_after_fail
+
+# coreboot config options: check sums
+984          16      h       0        check_sum
+
+# -----------------------------------------------------------------
+
+enumerations
+
+#ID value   text
+1     0     Disable
+1     1     Enable
+
+2     0     Enable
+2     1     Disable
+
+3     0     Fallback
+3     1     Normal
+
+4     0     Emergency
+4     1     Alert
+4     2     Critical
+4     3     Error
+4     4     Warning
+4     5     Notice
+4     6     Info
+4     7     Debug
+4     8     Spew
+
+# -----------------------------------------------------------------
+checksums
+
+checksum 392 415 984
diff --git a/src/mainboard/asrock/h81m-hds/data.vbt b/src/mainboard/asrock/h81m-hds/data.vbt
new file mode 100644
index 0000000..7190093
--- /dev/null
+++ b/src/mainboard/asrock/h81m-hds/data.vbt
Binary files differ
diff --git a/src/mainboard/asrock/h81m-hds/devicetree.cb b/src/mainboard/asrock/h81m-hds/devicetree.cb
new file mode 100644
index 0000000..32b5978
--- /dev/null
+++ b/src/mainboard/asrock/h81m-hds/devicetree.cb
@@ -0,0 +1,173 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2018 Tristan Corrick <tristan@corrick.kiwi>
+##
+## This program is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 2 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+
+chip northbridge/intel/haswell
+	register "gpu_ddi_e_connected" = "1"
+
+	device cpu_cluster 0 on
+		chip cpu/intel/haswell
+			register "c1_acpower" = "1"
+			register "c1_battery" = "1"
+			register "c2_acpower" = "3"
+			register "c2_battery" = "3"
+			register "c3_acpower" = "5"
+			register "c3_battery" = "5"
+
+			device lapic 0 on end
+			device lapic 0xacac off end
+		end
+	end
+
+	device domain 0 on
+		device pci 00.0 on # Host bridge
+			subsystemid 0x1849 0x0c00
+		end
+
+		device pci 01.0 on # PCIe graphics
+			subsystemid 0x1849 0x0c01
+		end
+
+		device pci 02.0 on # VGA controller
+			subsystemid 0x1849 0x0402
+		end
+
+		device pci 03.0 on # Mini-HD audio
+			subsystemid 0x1849 0x0c0c
+		end
+
+		chip southbridge/intel/lynxpoint
+			register "pirqa_routing" = "0x8b"
+			register "pirqb_routing" = "0x80"
+			register "pirqc_routing" = "0x8b"
+			register "pirqd_routing" = "0x8a"
+			register "pirqe_routing" = "0x80"
+			register "pirqf_routing" = "0x80"
+			register "pirqg_routing" = "0x80"
+			register "pirqh_routing" = "0x8a"
+
+			register "sata_ahci" = "1"
+			register "sata_port_map" = "0x33"
+
+			register "gen1_dec" = "0x00000295" # Super I/O HWM
+
+			device pci 14.0 on      # xHCI controller
+				subsystemid 0x1849 0x8c31
+			end
+			device pci 16.0 on      # Management Engine interface 1
+				subsystemid 0x1849 0x8c3a
+			end
+			device pci 16.1 off end # Management Engine interface 2
+			device pci 16.2 off end # Management Engine IDE-R
+			device pci 16.3 off end # Management Engine KT
+			device pci 19.0 off end # Intel Gigabit Ethernet
+			device pci 1a.0 on      # EHCI controller #2
+				subsystemid 0x1849 0x8c2d
+			end
+			device pci 1b.0 on      # HD audio controller
+				subsystemid 0x1849 0x7662
+			end
+			device pci 1c.0 on      # PCIe port #1
+				subsystemid 0x1849 0x8c10
+			end
+			device pci 1c.1 off end # PCIe port #2
+			device pci 1c.2 off end # PCIe port #3
+			device pci 1c.3 on      # Realtek Gigabit Ethernet
+				subsystemid 0x1849 0x8c16
+				chip drivers/net
+					register "customized_leds" = "0x0824"
+					device pci 00.0 on
+						subsystemid 0x1849 0x8168
+					end
+				end
+			end
+			device pci 1c.4 on      # ASMedia USB controller
+				subsystemid 0x1849 0x8c18
+				device pci 00.0 on
+					subsystemid 0x1849 0x1042
+				end
+			end
+			device pci 1c.5 on      # PCIe 1x slot
+				subsystemid 0x1849 0x8c1a
+			end
+			device pci 1c.6 off end # PCIe port #7
+			device pci 1c.7 off end # PCIe port #8
+			device pci 1d.0 on      # EHCI controller #1
+				subsystemid 0x1849 0x8c26
+			end
+			device pci 1f.0 on      # LPC bridge
+				subsystemid 0x1849 0x8c5c
+
+				chip superio/nuvoton/nct6776
+					device pnp 2e.0   off end # Floppy
+					device pnp 2e.1   on      # Parallel
+						io  0x60 = 0x0378
+						irq 0x70 = 7
+						drq 0x74 = 4      # No DMA
+						irq 0xf0 = 0x3c   # Printer mode
+					end
+					device pnp 2e.2   on      # UART A
+						io  0x60 = 0x03f8
+						irq 0x70 = 4
+					end
+					device pnp 2e.3   on      # IR
+						io  0x60 = 0x02f8
+						irq 0x70 = 3
+					end
+					device pnp 2e.5   on      # PS/2 KBC
+						io  0x60 = 0x0060
+						io  0x62 = 0x0064
+						irq 0x70 = 1      # Keyboard
+						irq 0x72 = 12     # Mouse
+					end
+					device pnp 2e.6   off end # CIR
+					device pnp 2e.7   off end # GPIO8
+					device pnp 2e.107 off end # GPIO9
+					device pnp 2e.8   off end # WDT
+					device pnp 2e.108 off end # GPIO0
+					device pnp 2e.208 off end # GPIOA
+					device pnp 2e.308 off end # GPIO base
+					device pnp 2e.109 off end # GPIO1
+					device pnp 2e.209 off end # GPIO2
+					device pnp 2e.309 off end # GPIO3
+					device pnp 2e.409 off end # GPIO4
+					device pnp 2e.509 off end # GPIO5
+					device pnp 2e.609 off end # GPIO6
+					device pnp 2e.709 off end # GPIO7
+					device pnp 2e.a   off end # ACPI
+					device pnp 2e.b   on      # HWM, LED
+						io  0x60 = 0x0290
+						io  0x62 = 0
+						irq 0x70 = 0
+					end
+					device pnp 2e.d   off end # VID
+					device pnp 2e.e   off end # CIR wake-up
+					device pnp 2e.f   off end # GPIO PP/OD
+					device pnp 2e.14  off end # SVID
+					device pnp 2e.16  off end # Deep sleep
+					device pnp 2e.17  off end # GPIOA
+				end
+			end
+			device pci 1f.2 on # SATA controller 1
+				subsystemid 0x1849 0x8c02
+			end
+			device pci 1f.3 on # SMBus
+				subsystemid 0x1849 0x8c22
+			end
+			device pci 1f.5 off end # SATA controller 2
+			device pci 1f.6 off end # Thermal
+		end
+	end
+end
diff --git a/src/mainboard/asrock/h81m-hds/dsdt.asl b/src/mainboard/asrock/h81m-hds/dsdt.asl
new file mode 100644
index 0000000..7ef9253
--- /dev/null
+++ b/src/mainboard/asrock/h81m-hds/dsdt.asl
@@ -0,0 +1,41 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018 Tristan Corrick <tristan@corrick.kiwi>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+DefinitionBlock(
+	"dsdt.aml",
+	"DSDT",
+	0x03,		/* DSDT Revision: ACPI v3.0 */
+	"COREv4",	/* OEM ID */
+	"COREBOOT",	/* OEM Table ID */
+	0x20181031	/* OEM Revision */
+)
+{
+	#include "acpi/platform.asl"
+	#include <southbridge/intel/lynxpoint/acpi/platform.asl>
+	#include <southbridge/intel/lynxpoint/acpi/globalnvs.asl>
+	#include <southbridge/intel/lynxpoint/acpi/sleepstates.asl>
+	#include <cpu/intel/haswell/acpi/cpu.asl>
+
+	Scope (\_SB)
+	{
+		Device (PCI0)
+		{
+		#include <northbridge/intel/haswell/acpi/haswell.asl>
+		#include <southbridge/intel/lynxpoint/acpi/pch.asl>
+		#include <drivers/intel/gma/acpi/default_brightness_levels.asl>
+		}
+	}
+}
diff --git a/src/mainboard/asrock/h81m-hds/gma-mainboard.ads b/src/mainboard/asrock/h81m-hds/gma-mainboard.ads
new file mode 100644
index 0000000..c0260da
--- /dev/null
+++ b/src/mainboard/asrock/h81m-hds/gma-mainboard.ads
@@ -0,0 +1,31 @@
+--
+-- This file is part of the coreboot project.
+--
+-- Copyright (C) 2018 Tristan Corrick <tristan@corrick.kiwi>
+--
+-- This program is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation, either version 2 of the License, or
+-- (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+
+with HW.GFX.GMA;
+with HW.GFX.GMA.Display_Probing;
+
+use HW.GFX.GMA;
+use HW.GFX.GMA.Display_Probing;
+
+private package GMA.Mainboard is
+
+   ports : constant Port_List :=
+     (HDMI1,
+      HDMI3,
+      Analog,
+      others => Disabled);
+
+end GMA.Mainboard;
diff --git a/src/mainboard/asrock/h81m-hds/gpio.h b/src/mainboard/asrock/h81m-hds/gpio.h
new file mode 100644
index 0000000..dde3e53
--- /dev/null
+++ b/src/mainboard/asrock/h81m-hds/gpio.h
@@ -0,0 +1,168 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018 Tristan Corrick <tristan@corrick.kiwi>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef ASROCK_H81M_HDS_GPIO_H
+#define ASROCK_H81M_HDS_GPIO_H
+
+#include <southbridge/intel/common/gpio.h>
+
+static const struct pch_gpio_set1 pch_gpio_set1_mode = {
+	.gpio0 = GPIO_MODE_GPIO,
+	.gpio1 = GPIO_MODE_GPIO,
+	.gpio6 = GPIO_MODE_GPIO,
+	.gpio7 = GPIO_MODE_GPIO,
+	.gpio12 = GPIO_MODE_GPIO,
+	.gpio13 = GPIO_MODE_GPIO,
+	.gpio14 = GPIO_MODE_GPIO,
+	.gpio15 = GPIO_MODE_GPIO,
+	.gpio16 = GPIO_MODE_GPIO,
+	.gpio17 = GPIO_MODE_GPIO,
+	.gpio24 = GPIO_MODE_GPIO,
+	.gpio27 = GPIO_MODE_GPIO,
+	.gpio28 = GPIO_MODE_GPIO,
+	.gpio31 = GPIO_MODE_GPIO,
+};
+
+static const struct pch_gpio_set1 pch_gpio_set1_direction = {
+	.gpio0 = GPIO_DIR_INPUT,
+	.gpio1 = GPIO_DIR_INPUT,
+	.gpio6 = GPIO_DIR_INPUT,
+	.gpio7 = GPIO_DIR_INPUT,
+	.gpio12 = GPIO_DIR_OUTPUT,
+	.gpio13 = GPIO_DIR_INPUT,
+	.gpio14 = GPIO_DIR_OUTPUT,
+	.gpio15 = GPIO_DIR_OUTPUT,
+	.gpio16 = GPIO_DIR_INPUT,
+	.gpio17 = GPIO_DIR_INPUT,
+	.gpio24 = GPIO_DIR_OUTPUT,
+	.gpio27 = GPIO_DIR_INPUT,
+	.gpio28 = GPIO_DIR_OUTPUT,
+	.gpio31 = GPIO_DIR_INPUT,
+};
+
+static const struct pch_gpio_set1 pch_gpio_set1_level = {
+	.gpio12 = GPIO_LEVEL_HIGH,
+	.gpio14 = GPIO_LEVEL_LOW,
+	.gpio15 = GPIO_LEVEL_LOW,
+	.gpio24 = GPIO_LEVEL_LOW,
+	.gpio28 = GPIO_LEVEL_LOW,
+};
+
+static const struct pch_gpio_set1 pch_gpio_set1_reset = {
+	.gpio8 = GPIO_RESET_RSMRST,
+};
+
+static const struct pch_gpio_set1 pch_gpio_set1_invert = {
+	.gpio13 = GPIO_INVERT,
+};
+
+static const struct pch_gpio_set1 pch_gpio_set1_blink = {
+};
+
+static const struct pch_gpio_set2 pch_gpio_set2_mode = {
+	.gpio32 = GPIO_MODE_GPIO,
+	.gpio33 = GPIO_MODE_GPIO,
+	.gpio34 = GPIO_MODE_GPIO,
+	.gpio35 = GPIO_MODE_GPIO,
+	.gpio42 = GPIO_MODE_GPIO,
+	.gpio43 = GPIO_MODE_GPIO,
+	.gpio46 = GPIO_MODE_GPIO,
+	.gpio49 = GPIO_MODE_GPIO,
+	.gpio50 = GPIO_MODE_GPIO,
+	.gpio51 = GPIO_MODE_GPIO,
+	.gpio52 = GPIO_MODE_GPIO,
+	.gpio53 = GPIO_MODE_GPIO,
+	.gpio54 = GPIO_MODE_GPIO,
+	.gpio55 = GPIO_MODE_GPIO,
+	.gpio57 = GPIO_MODE_GPIO,
+};
+
+static const struct pch_gpio_set2 pch_gpio_set2_direction = {
+	.gpio32 = GPIO_DIR_OUTPUT,
+	.gpio33 = GPIO_DIR_OUTPUT,
+	.gpio34 = GPIO_DIR_INPUT,
+	.gpio35 = GPIO_DIR_OUTPUT,
+	.gpio42 = GPIO_DIR_OUTPUT,
+	.gpio43 = GPIO_DIR_OUTPUT,
+	.gpio46 = GPIO_DIR_INPUT,
+	.gpio49 = GPIO_DIR_INPUT,
+	.gpio50 = GPIO_DIR_INPUT,
+	.gpio51 = GPIO_DIR_OUTPUT,
+	.gpio52 = GPIO_DIR_INPUT,
+	.gpio53 = GPIO_DIR_OUTPUT,
+	.gpio54 = GPIO_DIR_INPUT,
+	.gpio55 = GPIO_DIR_OUTPUT,
+	.gpio57 = GPIO_DIR_INPUT,
+};
+
+static const struct pch_gpio_set2 pch_gpio_set2_level = {
+	.gpio32 = GPIO_LEVEL_HIGH,
+	.gpio33 = GPIO_LEVEL_HIGH,
+	.gpio35 = GPIO_LEVEL_LOW,
+	.gpio42 = GPIO_LEVEL_LOW,
+	.gpio43 = GPIO_LEVEL_LOW,
+	.gpio51 = GPIO_LEVEL_HIGH,
+	.gpio53 = GPIO_LEVEL_HIGH,
+	.gpio55 = GPIO_LEVEL_HIGH,
+};
+
+static const struct pch_gpio_set2 pch_gpio_set2_reset = {
+};
+
+static const struct pch_gpio_set3 pch_gpio_set3_mode = {
+	.gpio68 = GPIO_MODE_GPIO,
+	.gpio69 = GPIO_MODE_GPIO,
+	.gpio72 = GPIO_MODE_GPIO,
+	.gpio73 = GPIO_MODE_GPIO,
+};
+
+static const struct pch_gpio_set3 pch_gpio_set3_direction = {
+	.gpio68 = GPIO_DIR_INPUT,
+	.gpio69 = GPIO_DIR_INPUT,
+	.gpio72 = GPIO_DIR_INPUT,
+	.gpio73 = GPIO_DIR_INPUT,
+};
+
+static const struct pch_gpio_set3 pch_gpio_set3_level = {
+};
+
+static const struct pch_gpio_set3 pch_gpio_set3_reset = {
+};
+
+const struct pch_gpio_map mainboard_gpio_map = {
+	.set1 = {
+		.mode		= &pch_gpio_set1_mode,
+		.direction	= &pch_gpio_set1_direction,
+		.level		= &pch_gpio_set1_level,
+		.blink		= &pch_gpio_set1_blink,
+		.invert		= &pch_gpio_set1_invert,
+		.reset		= &pch_gpio_set1_reset,
+	},
+	.set2 = {
+		.mode		= &pch_gpio_set2_mode,
+		.direction	= &pch_gpio_set2_direction,
+		.level		= &pch_gpio_set2_level,
+		.reset		= &pch_gpio_set2_reset,
+	},
+	.set3 = {
+		.mode		= &pch_gpio_set3_mode,
+		.direction	= &pch_gpio_set3_direction,
+		.level		= &pch_gpio_set3_level,
+		.reset		= &pch_gpio_set3_reset,
+	},
+};
+
+#endif /* ASROCK_H81M_HDS_GPIO_H */
diff --git a/src/mainboard/asrock/h81m-hds/hda_verb.c b/src/mainboard/asrock/h81m-hds/hda_verb.c
new file mode 100644
index 0000000..187b7c42
--- /dev/null
+++ b/src/mainboard/asrock/h81m-hds/hda_verb.c
@@ -0,0 +1,39 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018 Tristan Corrick <tristan@corrick.kiwi>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <stdint.h>
+#include <device/azalia_device.h>
+
+const u32 cim_verb_data[] = {
+	0x10ec0662,	/* Realtek ALC662 rev1 */
+	0x18497662,	/* Subsystem ID */
+	11,		/* Number of entries */
+	AZALIA_SUBVENDOR(1, 0x18497662),
+	AZALIA_PIN_CFG(1, 0x14, 0x01014010),
+	AZALIA_PIN_CFG(1, 0x15, 0x40000000),
+	AZALIA_PIN_CFG(1, 0x16, 0x411111f0),
+	AZALIA_PIN_CFG(1, 0x18, 0x01a19040),
+	AZALIA_PIN_CFG(1, 0x19, 0x02a19050),
+	AZALIA_PIN_CFG(1, 0x1a, 0x0181304f),
+	AZALIA_PIN_CFG(1, 0x1b, 0x02214020),
+	AZALIA_PIN_CFG(1, 0x1c, 0x411111f0),
+	AZALIA_PIN_CFG(1, 0x1d, 0x40a4c601),
+	AZALIA_PIN_CFG(1, 0x1e, 0x411111f0),
+};
+
+const u32 pc_beep_verbs[] = {};
+
+AZALIA_ARRAY_SIZES;
diff --git a/src/mainboard/asrock/h81m-hds/mainboard.c b/src/mainboard/asrock/h81m-hds/mainboard.c
new file mode 100644
index 0000000..54176c4
--- /dev/null
+++ b/src/mainboard/asrock/h81m-hds/mainboard.c
@@ -0,0 +1,29 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018 Tristan Corrick <tristan@corrick.kiwi>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <device/device.h>
+#include <drivers/intel/gma/int15.h>
+
+static void mainboard_enable(struct device *dev)
+{
+	install_intel_vga_int15_handler(GMA_INT15_ACTIVE_LFP_NONE,
+					GMA_INT15_PANEL_FIT_DEFAULT,
+					GMA_INT15_BOOT_DISPLAY_DEFAULT, 0);
+}
+
+struct chip_operations mainboard_ops = {
+	.enable_dev = mainboard_enable,
+};
diff --git a/src/mainboard/asrock/h81m-hds/romstage.c b/src/mainboard/asrock/h81m-hds/romstage.c
new file mode 100644
index 0000000..f3c2b3b
--- /dev/null
+++ b/src/mainboard/asrock/h81m-hds/romstage.c
@@ -0,0 +1,131 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007-2010 coresystems GmbH
+ * Copyright (C) 2012 Google Inc.
+ * Copyright (C) 2018 Tristan Corrick <tristan@corrick.kiwi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <stdint.h>
+#include <cpu/intel/romstage.h>
+#include <cpu/intel/haswell/haswell.h>
+#include <northbridge/intel/haswell/haswell.h>
+#include <northbridge/intel/haswell/pei_data.h>
+#include <southbridge/intel/lynxpoint/pch.h>
+#include <superio/nuvoton/common/nuvoton.h>
+#include <superio/nuvoton/nct6776/nct6776.h>
+#include "gpio.h"
+
+static const struct rcba_config_instruction rcba_config[] = {
+	RCBA_SET_REG_16(D31IR, DIR_ROUTE(PIRQA, PIRQD, PIRQC, PIRQA)),
+	RCBA_SET_REG_16(D29IR, DIR_ROUTE(PIRQH, PIRQD, PIRQA, PIRQC)),
+	RCBA_SET_REG_16(D28IR, DIR_ROUTE(PIRQA, PIRQB, PIRQC, PIRQD)),
+	RCBA_SET_REG_16(D27IR, DIR_ROUTE(PIRQG, PIRQB, PIRQC, PIRQD)),
+	RCBA_SET_REG_16(D26IR, DIR_ROUTE(PIRQA, PIRQF, PIRQC, PIRQD)),
+	RCBA_SET_REG_16(D25IR, DIR_ROUTE(PIRQE, PIRQF, PIRQG, PIRQH)),
+	RCBA_SET_REG_16(D22IR, DIR_ROUTE(PIRQA, PIRQD, PIRQC, PIRQB)),
+	RCBA_SET_REG_16(D20IR, DIR_ROUTE(PIRQA, PIRQB, PIRQC, PIRQD)),
+
+	RCBA_RMW_REG_32(FD, ~0, PCH_DISABLE_ALWAYS),
+
+	RCBA_END_CONFIG,
+};
+
+void mainboard_config_superio(void)
+{
+	const pnp_devfn_t GLOBAL_PSEUDO_DEV = PNP_DEV(0x2e, 0);
+	const pnp_devfn_t SERIAL_DEV = PNP_DEV(0x2e, NCT6776_SP1);
+	const pnp_devfn_t ACPI_DEV = PNP_DEV(0x2e, NCT6776_ACPI);
+	const pnp_devfn_t IR_DEV = PNP_DEV(0x2e, NCT6776_SP2);
+
+	nuvoton_enable_serial(SERIAL_DEV, CONFIG_TTYS0_BASE);
+
+	nuvoton_pnp_enter_conf_state(GLOBAL_PSEUDO_DEV);
+
+	/* Select HWM/LED functions instead of floppy functions. */
+	pnp_write_config(GLOBAL_PSEUDO_DEV, 0x1c, 0x03);
+	pnp_write_config(GLOBAL_PSEUDO_DEV, 0x24, 0x24);
+
+	/* Power RAM in S3 and let the PCH handle power failure actions. */
+	pnp_set_logical_device(ACPI_DEV);
+	pnp_write_config(ACPI_DEV, 0xe4, 0x70);
+
+	/*
+	 * Don't know what's needed here, just set the same as the vendor
+	 * firmware.
+	 */
+	pnp_set_logical_device(IR_DEV);
+	pnp_write_config(IR_DEV, 0xf1, 0x5c);
+
+	nuvoton_pnp_exit_conf_state(GLOBAL_PSEUDO_DEV);
+}
+
+void mainboard_romstage_entry(unsigned long bist)
+{
+	struct pei_data pei_data = {
+		.pei_version = PEI_VERSION,
+		.mchbar = (uintptr_t)DEFAULT_MCHBAR,
+		.dmibar = (uintptr_t)DEFAULT_DMIBAR,
+		.epbar = DEFAULT_EPBAR,
+		.pciexbar = DEFAULT_PCIEXBAR,
+		.smbusbar = SMBUS_IO_BASE,
+		.wdbbar = 0x4000000,
+		.wdbsize = 0x1000,
+		.hpet_address = HPET_ADDR,
+		.rcba = (uintptr_t)DEFAULT_RCBA,
+		.pmbase = DEFAULT_PMBASE,
+		.gpiobase = DEFAULT_GPIOBASE,
+		.temp_mmio_base = 0xfed08000,
+		.system_type = 1, /* desktop/server */
+		.tseg_size = CONFIG_SMM_TSEG_SIZE,
+		.spd_addresses = { 0xa0, 0x00, 0xa4, 0x00 },
+		.ec_present = 0,
+		.dimm_channel0_disabled = 2, /* Disable DIMM 1 on channel 0. */
+		.dimm_channel1_disabled = 2, /* Disable DIMM 1 on channel 1. */
+		.max_ddr3_freq = 1600,
+		.usb2_ports = {
+			/* Length, Enable, OCn#, Location */
+			{ 0x0040, 1, 0, USB_PORT_BACK_PANEL },
+			{ 0x0040, 1, 0, USB_PORT_BACK_PANEL },
+			{ 0x0040, 1, 1, USB_PORT_BACK_PANEL },
+			{ 0x0040, 1, 1, USB_PORT_BACK_PANEL },
+			{ 0x0040, 1, 2, USB_PORT_BACK_PANEL },
+			{ 0x0040, 1, 2, USB_PORT_BACK_PANEL },
+			{ 0x0040, 0, USB_OC_PIN_SKIP, USB_PORT_SKIP },
+			{ 0x0040, 0, USB_OC_PIN_SKIP, USB_PORT_SKIP },
+			{ 0x0040, 1, 4, USB_PORT_BACK_PANEL },
+			{ 0x0040, 1, 4, USB_PORT_BACK_PANEL },
+			{ 0x0040, 1, 5, USB_PORT_BACK_PANEL },
+			{ 0x0040, 1, 5, USB_PORT_BACK_PANEL },
+			{ 0x0040, 0, USB_OC_PIN_SKIP, USB_PORT_SKIP },
+			{ 0x0040, 0, USB_OC_PIN_SKIP, USB_PORT_SKIP },
+		},
+		.usb3_ports = {
+			/* Enable, OCn# */
+			{ 1, 0 },
+			{ 1, 0 },
+			{ 0, USB_OC_PIN_SKIP },
+			{ 0, USB_OC_PIN_SKIP },
+			{ 0, USB_OC_PIN_SKIP },
+			{ 0, USB_OC_PIN_SKIP },
+		},
+	};
+
+	struct romstage_params romstage_params = {
+		.pei_data = &pei_data,
+		.gpio_map = &mainboard_gpio_map,
+		.rcba_config = &rcba_config[0],
+		.bist = bist,
+	};
+
+	romstage_common(&romstage_params);
+}