mb/asus/p8x7x-series: Add P8H77-V as a variant of P8X7X series

Mainboard information can be found in the included documentation.

Signed-off-by: Bill XIE <persmule@hardenedlinux.org>
Change-Id: Ic811e24bd72da84e5ca8f5b09f2eb65872153b72
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55111
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

Documentation/mainboard/asus/p8h77-v.md

@@ -0,0 +1,81 @@
+# ASUS P8Z77-V
+
+This page describes how to run coreboot on the [ASUS P8H77-V].
+
+## Flashing coreboot
+
+```eval_rst
++---------------------+----------------+
+| Type                | Value          |
++=====================+================+
+| Socketed flash      | yes            |
++---------------------+----------------+
+| Model               | W25Q64FVA1Q    |
++---------------------+----------------+
+| Size                | 8 MiB          |
++---------------------+----------------+
+| Package             | DIP-8          |
++---------------------+----------------+
+| Write protection    | yes            |
++---------------------+----------------+
+| Dual BIOS feature   | no             |
++---------------------+----------------+
+| Internal flashing   | no             |
++---------------------+----------------+
+```
+
+The flash IC is located beside the SATA ports (circled):
+![](p8z77-v.jpg)
+
+### How to flash
+
+The main SPI flash cannot be written because the vendor firmware disables BIOSWE
+and enables BLE/SMM_BWP flags in BIOS_CNTL for their latest BIOSes. An external
+programmer is required. You must flash standalone, flashing in-circuit doesn't
+work. The flash chip is socketed, so it's easy to remove and reflash.
+
+## Working
+
+- PS/2 keyboard with SeaBIOS 1.14.0 and Debian GNU/Linux with kernel 5.10.28
+- Integrated Ethernet NIC
+- S3 Suspend to RAM
+- USB2 on rear and front panel connectors
+- USB3
+- Integrated SATA
+- CPU Temp sensors (tested PSensor on GNU/Linux)
+- Native raminit
+- Integrated graphics with libgfxinit (VGA/DVI-D/HDMI tested and working)
+- PCIe in PCIe-16x slots
+- Debug output from serial port
+
+## Untested
+
+- EHCI debugging
+- S/PDIF audio
+- PS/2 mouse
+
+## Technology
+
+```eval_rst
++------------------+--------------------------------------------------+
+| Northbridge      | :doc:`../../northbridge/intel/sandybridge/index` |
++------------------+--------------------------------------------------+
+| Southbridge      | bd82x6x                                          |
++------------------+--------------------------------------------------+
+| CPU              | model_206ax                                      |
++------------------+--------------------------------------------------+
+| Super I/O        | Nuvoton NCT6779D                                 |
++------------------+--------------------------------------------------+
+| EC               | None                                             |
++------------------+--------------------------------------------------+
+| Coprocessor      | Intel Management Engine                          |
++------------------+--------------------------------------------------+
+```
+
+## Extra resources
+
+- [Flash chip datasheet][W25Q64FVA1Q]
+
+[ASUS P8H77-V]: https://www.asus.com/supportonly/p8h77v/helpdesk_knowledge/
+[W25Q64FVA1Q]: https://www.winbond.com/resource-files/w25q64fv%20revs%2007182017.pdf
+[flashrom]: https://flashrom.org/Flashrom

Documentation/mainboard/index.md

@@ -21,6 +21,7 @@ This section contains documentation about coreboot on specific mainboards.
 - [P5Q](asus/p5q.md)
 - [P8H61-M LX](asus/p8h61-m_lx.md)
 - [P8H61-M Pro](asus/p8h61-m_pro.md)
+- [P8H77-V](asus/p8h77-v.md)
 - [P8Z77-M Pro](asus/p8z77-m_pro.md)
 - [P8Z77-V](asus/p8z77-v.md)