Doc/mb/asrock/h110m: update info about PEG

- Now there is no need to additionally configure the FSP
   before building;
 - PEG works with high link speed 8 GT/s (Gen 3);
 - external GPU supported, but dynamic switching between iGPU and PEG
   is not yet supported.

Change-Id: Ie0f9db47c0b88052b090cba139f0ae821758935d
Signed-off-by: Maxim Polyakov <max.senia.poliak@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31949
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

Documentation/mainboard/asrock/h110m-dvs.md

@@ -21,27 +21,6 @@ FSP Information:
 +-----------------------------+-------------------+-------------------+
 ```
 
-Please take FSP from the directory `3rdparty/fsp/KabylakeFspBinPkg/` in
-the coreboot or download the latest version from [github][FSP github].
-
-You must use [Intel Binary Configuration Tool] BCT to set the following
-parameters in FSP.fd to initialize the PEG x16 port:
-
-```
-Peg0Enable = Enable
-Peg0MaxLinkSpeed = Gen3
-Peg0MaxLinkWidth = Auto
-```
-
-BCT creates Fsp_M.fd, Fsp_S.fd and Fsp_T.fd. These files are integrated
-into the coreboot image. If PEG port is not used, you can get these files
-without BTC:
-
-```bash
-# split FSP.fd
-python 3rdparty/fsp/Tools/SplitFspBin.py split -f 3rdparty/fsp/KabylakeFspBinPkg/Fsp.fd
-```
-
 ## Building coreboot
 
 The following steps set the default parameters for this board to build a
@@ -53,8 +32,7 @@ touch .config
 ./util/scripts/config --enable VENDOR_ASROCK
 ./util/scripts/config --enable BOARD_ASROCK_H110M_DVS
 ./util/scripts/config --enable CONFIG_ADD_FSP_BINARIES
-./util/scripts/config --set-str CONFIG_FSP_M_FILE "/path/to/Fsp_M.fd"
+./util/scripts/config --enable CONFIG_FSP_USE_REPO
-./util/scripts/config --set-str CONFIG_FSP_S_FILE "/path/to/Fsp_S.fd"
 ./util/scripts/config --set-str REALTEK_8168_MACADDRESS "xx:xx:xx:xx:xx:xx"
 make olddefconfig
 ```
@@ -97,10 +75,9 @@ facing towards the bottom of the board.
 
 ## Known issues
 
-- The VGA port doesn't work.
+- The VGA port doesn't work. Discrete graphic card is used as primary
-
+  device for display output (if CONFIG_ONBOARD_VGA_IS_PRIMARY is not
-- PEG x16 port training correctly runs only at link speed of 2.5GT/s(gen1).
+  set). Dynamic switching between iGPU and PEG is not yet supported.
-  It takes more time to research the schematic of this board.
 
 - SuperIO GPIO pin is used to reset Realtek chip. However, since the
   Logical Device 7 (GPIO6, GPIO7, GPIO8) is not initialized, the network
@@ -121,7 +98,7 @@ facing towards the bottom of the board.
 
 - integrated graphics init with libgfxinit (see [Known issues](#known-issues))
 - PCIe x1
-- PEG x16 Gen1 (see [Known issues](#known-issues))
+- PEG x16 Gen3
 - SATA
 - USB
 - serial port
@@ -131,7 +108,6 @@ facing towards the bottom of the board.
 
 ## TODO
 
-- PEG x16 Gen3
 - NCT6791D GPIOs
 - onboard network (see [Known issues](#known-issues))
 - S3 suspend/resume
@@ -155,8 +131,6 @@ facing towards the bottom of the board.
 ```
 
 [ASRock H110M-DVS]: https://www.asrock.com/mb/Intel/H110M-DVS%20R2.0/
-[FSP github]: https://github.com/IntelFsp/FSP
-[Intel Binary Configuration Tool]: https://github.com/IntelFsp/BCT
 [MX25L6473E]: http://www.macronix.com/Lists/Datasheet/Attachments/7380/MX25L6473E,%203V,%2064Mb,%20v1.4.pdf
 [flashrom]: https://flashrom.org/Flashrom
 [H110M-DVS manual]: http://asrock.pc.cdn.bitgravity.com/Manual/H110M-DVS%20R2.0.pdf