Documentation: Add HP Compaq 8200 and NPCD378

Change-Id: I56db0cc11cfa5a1a537091553393542312d4f212
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/26543
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

Documentation/mainboard/hp/compaq_8200_sff.md

@@ -0,0 +1,80 @@
+# HP Compaq 8200 Elite SFF
+
+This page describes how to run coreboot on the [Compaq 8200 Elite SFF] desktop
+from [HP].
+
+## TODO
+
+The following things are still missing from this coreboot port:
+
+- Extended HWM reporting
+- Advanced LED control
+- Advanced power configuration in S3
+
+## Flashing coreboot
+
+```eval_rst
++---------------------+------------+
+| Type                | Value      |
++=====================+============+
+| Socketed flash      | no         |
++---------------------+------------+
+| Model               | MX25L6406E |
++---------------------+------------+
+| Size                | 8 MiB      |
++---------------------+------------+
+| In circuit flashing | yes        |
++---------------------+------------+
+| Package             | SOIC-8     |
++---------------------+------------+
+| Write protection    | No         |
++---------------------+------------+
+| Dual BIOS feature   | No         |
++---------------------+------------+
+| Internal flashing   | yes        |
++---------------------+------------+
+```
+
+### Internal programming
+
+The SPI flash can be accessed using [flashrom].
+
+### External programming
+
+External programming with an SPI adapter and [flashrom] does work, but it powers the
+whole southbridge complex. You need to supply enough current through the programming adapter.
+
+If you want to use a SOIC pomona test clip, you have to cut the 2nd DRAM DIMM holder,
+as otherwise there's not enough space near the flash.
+
+**Position of SOIC-8 flash IC near 2nd DIMM holder**
+![][compaq_8200_flash1]
+
+[compaq_8200_flash1]: compaq_8200_sff_flash1.jpg
+
+**Closeup view of SOIC-8 flash IC**
+![][compaq_8200_flash2]
+
+[compaq_8200_flash2]: compaq_8200_sff_flash2.jpg
+
+## Technology
+
+```eval_rst
++------------------+--------------------------------------+
+| Northbridge      | Sandy Bridge                         |
++------------------+--------------------------------------+
+| Southbridge      | bd82x6x                              |
++------------------+--------------------------------------+
+| CPU              | model_206ax                          |
++------------------+--------------------------------------+
+| SuperIO          | :doc:`../../superio/nuvoton/npcd378` |
++------------------+--------------------------------------+
+| EC               |                                      |
++------------------+--------------------------------------+
+| Coprocessor      | Intel ME                             |
++------------------+--------------------------------------+
+```
+
+[Compaq 8200 Elite SFF]: https://support.hp.com/us-en/document/c03414707
+[HP]: https://www.hp.com/
+[flashrom]: https://flashrom.org/Flashrom

Documentation/mainboard/index.md

@@ -5,3 +5,7 @@ This section contains documentation about coreboot on specific mainboards.
 ## SiFive
 
 - [SiFive HiFive Unleashed](sifive/hifive-unleashed.md)
+
+## HP
+
+- [Compaq 8200 Elite SFF](hp/compaq_8200_sff.md)