mainboard/portwell/m107: Do initial mainboard commit

Initial support for Portwell PQ7-M107 (Q7) module.
Code based on Intel Strago mainboard.

BUG=N/A
TEST=booting SeaBIOS and Linux 4.20 kernel on PQ7-M107

Change-Id: I7d3173fdcf881f894a75cd9798ba173b425d4e62
Signed-off-by: Frans Hendriks <fhendriks@eltan.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/29470
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

Documentation/mainboard/index.md

@@ -69,6 +69,10 @@ The boards in this section are not real mainboards, but emulators.
 - [T4xx common](lenovo/t4xx_series.md)
 - [X2xx common](lenovo/x2xx_series.md)
 
+## Portwell
+
+- [PQ7-M107](portwell/pq7-m107.md)
+
 ### Sandy Bridge series
 
 - [T420](lenovo/t420.md)

Documentation/mainboard/portwell/pq7-m107.md

@@ -0,0 +1,79 @@
+# Portwell PQ7-M107
+
+This page describes how to run coreboot on the [Portwell PQ7-M107].
+
+PQ7-M107 are assembled with different onboard memory modules:
+	Rev 1.0	Onboard Samsung K4B8G1646D-MYKO memory
+	Rev 1.1	and 1.2 Onboard Micron MT41K512M16HA-125A memory
+
+Use 'make menuconfig' to configure `onboard memory manufacture` in Mainboard
+menu.
+
+## Required blobs
+
+This board currently requires:
+fsp blob	3rdparty/fsp/BraswellFspBinPkg/FspBin/BSWFSP.fd
+Microcode	Intel Braswell cpuid 1046C4 version 410
+		(Used pre-built binary retrieved from Intel site)
+
+## Flashing coreboot
+
+### Internal programming
+
+The main SPI flash can be accessed using [flashrom].
+
+### External programming
+
+The system has an internal flash chip which is a 8 MiB soldered SOIC-8 chip.
+This chip is located on the top middle side of the board. It's located
+between SoC and Q7 connector. Use clip (or solder wires) to program
+the chip.
+Specifically, it's a Winbond W25Q64FW (1.8V), whose datasheet can be found
+[here][W25Q64FW].
+
+## Known issues
+
+- The PQ7 module contains Q7 connector only. Depending on the carrier
+serial/video/pcie ports might be available.
+
+## Untested
+
+- hardware monitor
+- SDIO
+- Full Embedded Controller support
+
+## Working (using carrier)
+
+- USB
+- Gigabit Ethernet
+- integrated graphics
+- flashrom
+- external graphics
+- PCIe
+- eMMC
+- SATA
+- serial port
+- SMbus
+- HDA (codec on carrier)
+- initialization with FSP MR2
+- SeaBIOS payload (version rel-1.11.0-44-g7961917)
+- Embedded Linux (Ubuntu 4.15+)
+
+## Technology
+
+```eval_rst
++------------------+--------------------------------------------------+
+| SoC              | Intel Atom Processor N3710                       |
++------------------+--------------------------------------------------+
+| CPU              | Intel Braswell (N3710)                           |
++------------------+--------------------------------------------------+
+| Super I/O, EC    | ITE8256                                          |
++------------------+--------------------------------------------------+
+| Coprocessor      | Intel Management Engine                          |
++------------------+--------------------------------------------------+
+```
+
+[Portwell PQ7-M107]: http://portwell.com/products/detail.php?CUSTCHAR1=PQ7-M107
+[W25Q64FW]: https://www.winbond.com/resource-files/w25q64fw%20revn%2005182017%20sfdp.pdf
+[flashrom]: https://flashrom.org/Flashrom
+[Board manual]: www.portwell.com/pdf/embedded/PQ7-M107.pdf