mb/asus/p8z77-series: Add P8Z77-V as a variant of P8Z77 series

Mainboard information can be found in the included documentation.

Signed-off-by: Bill XIE <persmule@hardenedlinux.org>
Change-Id: Ic56ac0e5f93a6e818ef0666e41996718471b1cf6
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54338
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

Documentation/mainboard/asus/p8z77-v.md

@@ -0,0 +1,112 @@
+# ASUS P8Z77-V
+
+This page describes how to run coreboot on the [ASUS P8Z77-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 between the black and white PCI Express x16 slots (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 (Z77's and ASMedia's works)
+- Integrated SATA of Z77
+- Integrated SATA of ASM1061 (works under GNU/Linux but not under SeaBIOS)
+- CPU Temp sensors (tested PSensor on GNU/Linux)
+- TPM on TPM-header (tested tpm-tools with TPM 1.2 Infineon SLB9635TT12)
+- Native raminit
+- Integrated graphics with libgfxinit (VGA/DVI-D/HDMI tested and working)
+- PCIe in PCIe-16x/8x slots (tested using an S3 Matrix GPU)
+- Debug output from serial port
+- Atheros AR9485 half-height mini PCIe WNIC adapted with Wi-Fi Go! Adapter
+- Default PCIe config (PCIEX_16_3 as 1x, PCIe Port 4 to ASM1061 SATA, see below
+  for other potential options)
+
+## Untested
+
+- EHCI debugging
+- S/PDIF audio
+- PS/2 mouse
+
+## Not working
+
+- PCIEX_1_2 (expected under default PCIe config)
+- Other PCIe configs (see below)
+
+## PCIe config
+On Asus vendor firmware, other than the default config already supported here,
+there remain another two configs: "PCIEX_16_3 as x4, with PCIEX_1_1, PCIEX_1_2
+and onboard ASM1061 disabled" and "PCIEX_16_3 as x1, but PCIe Port 4 to PCIEX_1_2,
+with onboard ASM1061 disabled".
+
+Configuring PCIEX_16_3 as x4 needs to program 0x3 to the LSB of PCHSTRP9, but
+also needs to configure GPIOs in the Super I/O chip different than the default
+config in this board's override tree.
+
+Configuring PCIe Port 4 to PCIEX_1_2 needs to configure GPIOs in the Super I/O
+chip differently than the default config.
+
+I have tried a lot, but sadly I am unable to produce the same result as the vendor
+firmware.
+
+## Asus Wi-Fi Go!
+Asus Wi-Fi Go! has several versions. P8Z77-V has the earliest version.
+See [Asus Wi-Fi Go! v1].
+
+## 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 P8Z77-V]: https://www.asus.com/supportonly/p8z77v/helpdesk_knowledge/
+[W25Q64FVA1Q]: https://www.winbond.com/resource-files/w25q64fv%20revs%2007182017.pdf
+[flashrom]: https://flashrom.org/Flashrom
+[Asus Wi-Fi Go! v1]: ./wifigo_v1.md

Documentation/mainboard/asus/wifigo_v1.md

@@ -0,0 +1,40 @@
+# Asus Wi-Fi Go! v1
+
+In this version, a standard half-length mPCIe card is mounted on the Asus Wi-Fi
+Go! daughter board, and the daughter board is connected to the motherboard
+through a proprietary 16-1 pin connector.
+![](wifigo_v1_connector.jpg)
+
+I managed to grope the most pinout of the proprietary connector.
+See [Mini PCIe pinout] for more info.
+
+```eval_rst
++------------+----------+-----------+------------+----------+-----------+
+| WIFIGO Pin | Usage    | mPCIe pin | WIFIGO Pin | Usage    | mPCIe pin |
++============+==========+===========+============+==========+===========+
+| 1          | 3.3v     | (many)    | 2          | REFCLK-  | 11        |
++------------+----------+-----------+------------+----------+-----------+
+| 3          | GND      | (many)    | 4          | REFCLK+  | 13        |
++------------+----------+-----------+------------+----------+-----------+
+| 5          | WAKE#    | 1         | 6          | PERn0    | 23        |
++------------+----------+-----------+------------+----------+-----------+
+| 7          | (absent) |           | 8          | PERp0    | 25        |
++------------+----------+-----------+------------+----------+-----------+
+| 9          | GND      |           | 10         | PETn0    | 31        |
++------------+----------+-----------+------------+----------+-----------+
+| 11         | PERST#   | 20        | 12         | PETp0    | 33        |
++------------+----------+-----------+------------+----------+-----------+
+| 13         | GND      |           | 14         | (USBD-?) | (36?)     |
++------------+----------+-----------+------------+----------+-----------+
+| 15         | 3.3v     |           | 16         | (USBD+?) | (38?)     |
++------------+----------+-----------+------------+----------+-----------+
+```
+
+There are two kinds of daughter boards using this connector. One among them has
+one MMCX antenna connector, the other has two antenna connectors and USB lane
+wired (this kind may be called BT Go!). I can only obtain the former, so I
+cannot confirm the exact way the USB data lane gets wired.
+![](wifigo_v1_board.jpg)
+
+## Extra resources
+[Mini PCIe pinout]: https://pinoutguide.com/Slots/mini_pcie_pinout.shtml

Documentation/mainboard/index.md

@@ -22,6 +22,7 @@ This section contains documentation about coreboot on specific mainboards.
 - [P8H61-M LX](asus/p8h61-m_lx.md)
 - [P8H61-M Pro](asus/p8h61-m_pro.md)
 - [P8Z77-M Pro](asus/p8z77-m_pro.md)
+- [P8Z77-V](asus/p8z77-v.md)
 
 ## Cavium