mainboard/facebook/fbg1701: Do initial mainboard commit

Initial support for Facebook FBG-1701 system.
coreboot implementation based on Intel Strago mainboard.

Configure 'Onboard memory manufacturer' which must match HW.

BUG=N/A
TEST=booting SeaBIOS and Linux 4.15+ kernel on Facebook FBG-1701

Change-Id: I28ac78a630ee705b1e546031f024bfe7f952ab39
Signed-off-by: Frans Hendriks <fhendriks@eltan.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/30414
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: David Hendricks <david.hendricks@gmail.com>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

Documentation/mainboard/facebook/fbg1701.md

@@ -0,0 +1,83 @@
+# Facebook FBG-1701
+
+This page describes how to run coreboot on the Facebook FBG1701.
+
+FBG1701 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 manufacturer` 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-build 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 to 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].
+
+The system has an external flash chip which is a 8 MiB soldered SOIC-8 chip.
+This chip is located in the middle of carrier board close to the flex cable
+connection.
+Specifically, it's a Winbond W25Q64FV (3.3V), whose datasheet can be found
+[here][W25Q64FV].
+
+## Known issues
+
+- None
+
+## Untested
+
+- hardware monitor
+- SDIO
+- Full Embedded Controller support
+
+## Working
+
+- USB
+- Gigabit Ethernet
+- integrated graphics
+- flashrom
+- external graphics
+- PCIe
+- eMMC
+- SATA
+- serial port
+- SMBus
+- HDA
+- initialization with FSP MR2
+- SeaBIOS payload
+- 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                          |
++------------------+--------------------------------------------------+
+```
+
+[W25Q64FW]: https://www.winbond.com/resource-files/w25q64fw%20revn%2005182017%20sfdp.pdf
+[W25Q64FV]: https://www.winbond.com/resource-files/w25q64fv%20revs%2007182017.pdf
+[flashrom]: https://flashrom.org/Flashrom

Documentation/mainboard/index.md

@@ -30,6 +30,10 @@ The boards in this section are not real mainboards, but emulators.
 - [IceLake RVP](intel/icelake_rvp.md)
 - [KBLRVP11](intel/kblrvp11.md)
 
+## Facebook
+
+- [FBG-1701](facebook/fbg1701.md)
+
 ## Foxconn
 
 - [D41S](foxconn/d41s.md)