Documentation: Add HP EliteBook 8760w

Also add the HP EliteBook document from wiki.

Change-Id: I189db9c279705af53d82af66d0c2e8afb6f84d73
Signed-off-by: Iru Cai <mytbk920423@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/30950
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

Documentation/mainboard/hp/8760w.md

@@ -0,0 +1,82 @@
+# HP EliteBook 8760w
+
+This page describes how to run coreboot on the [HP EliteBook 8760w].
+
+## Flashing coreboot
+
+```eval_rst
++---------------------+------------+
+| Type                | Value      |
++=====================+============+
+| Socketed flash      | no         |
++---------------------+------------+
+| Model               | W25Q64.V   |
++---------------------+------------+
+| Size                | 8 MiB      |
++---------------------+------------+
+| Package             | SOIC-8     |
++---------------------+------------+
+| Write protection    | no         |
++---------------------+------------+
+| Dual BIOS feature   | no         |
++---------------------+------------+
+| In circuit flashing | yes        |
++---------------------+------------+
+| Internal flashing   | yes        |
++---------------------+------------+
+```
+
+## Required proprietary blobs
+
+- Intel Firmware Descriptor, ME and GbE firmware
+- EC: please read [EliteBook Series](elitebook_series)
+
+## Flashing instructions
+
+HP EliteBook 8760w has an 8MB SOIC-8 flash chip on the bottom of the
+mainboard. You just need to remove the service cover, and use an SOIC-8
+clip to read and flash the chip.
+
+![8760w_chip_location](8760w_flash.jpg)
+
+## Untested
+
+- dock: serial port, parallel port, ...
+- TPM
+- S3 suspend/resume
+- Gigabit Ethernet
+
+## Working
+
+- i7-2630QM, 0+4G+8G+0
+- i7-3720QM, 8G+8G+8G+8G
+- Arch Linux boot from SeaBIOS payload
+- EHCI debug: the port is at the right side, next to the charging port
+- SATA
+- eSATA
+- USB2 and USB3
+- keyboard, touchpad, trackpad
+- WLAN
+- WWAN
+- EC ACPI
+- Using `me_cleaner`
+
+## Technology
+
+```eval_rst
++------------------+--------------------------------------------------+
+| Northbridge      | :doc:`../../northbridge/intel/sandybridge/index` |
++------------------+--------------------------------------------------+
+| Southbridge      | bd82x6x                                          |
++------------------+--------------------------------------------------+
+| CPU              | model_206ax                                      |
++------------------+--------------------------------------------------+
+| Super I/O        | SMSC LPC47n217                                   |
++------------------+--------------------------------------------------+
+| EC               | SMSC KBC1126                                     |
++------------------+--------------------------------------------------+
+| Coprocessor      | Intel Management Engine                          |
++------------------+--------------------------------------------------+
+```
+
+[HP EliteBook 8760w]: https://support.hp.com/us-en/product/hp-elitebook-8760w-mobile-workstation/5071180