mb/supermicro/x11ssh: Add Supermicro X11SSH-TF

Add support for the X11SSH-TF which is based on Intel KBL.

Working:
* SeaBIOS payload
* LinuxBoot payload
* IPMI of BMC
* PCIe, SATA, USB and M.2 ports
* RS232 serial
* Native graphics init

Not working:
* TianoCore doesn't work yet as the Aspeed NGI is text mode only.
* Intel SGX, due to random crashes in soc/intel/common

For more details have a look at the documentation.

Please apply those patches as well for good user experience:

Ica0c20255f661dd61edc3a7d15646b7447c4658e

Signed-off-by: Christian Walter <christian.walter@9elements.com>
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Signed-off-by: Felix Singer <felix.singer@9elements.com>
Change-Id: I2edaa4a928de3a065e517c0f20e3302b4b702323
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32734
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>

3 files changed, 75 insertions, 0 deletions

diff --git a/Documentation/mainboard/index.md b/Documentation/mainboard/index.md
index 0f3105f85b..08689b7c9b 100644
--- a/Documentation/mainboard/index.md
+++ b/Documentation/mainboard/index.md
@@ -111,6 +111,7 @@ The boards in this section are not real mainboards, but emulators.
 ## Supermicro
 
 - [X10SLM+-F](supermicro/x10slm-f.md)
+- [X11SSH-TF](supermicro/x11ssh-tf.md)
 
 ## UP
 
diff --git a/Documentation/mainboard/supermicro/x11ssh-tf.md b/Documentation/mainboard/supermicro/x11ssh-tf.md
new file mode 100644
index 0000000000..a9dc838906
--- /dev/null
+++ b/Documentation/mainboard/supermicro/x11ssh-tf.md
@@ -0,0 +1,74 @@
+# Supermicro X11SSH-TF
+
+This section details how to run coreboot on the [Supermicro X11SSH-TF].
+
+## Required proprietary blobs
+
+* [Intel FSP2.0]
+* Intel ME
+
+## Flashing coreboot
+
+The board can be flashed externally using *some* programmers.
+The CH341 was found working, while Dediprog won't detect the chip.
+
+For more details have a look at the [flashing tutorial].
+
+The flash IC can be found between the two PCIe slots near the southbridge:
+![](x11ssh_flash.jpg)
+
+## BMC (IPMI)
+
+This board has an ASPEED [AST2400], which has BMC functionality. The
+BMC firmware resides in a 32 MiB SOIC-16 chip in the corner of the
+mainboard near the [AST2400]. This chip is an [MX25L25635F].
+
+## Known issues
+
+- Intel SGX causes secondary APs to crash (disabled for now).
+- Tianocore doesn't work with Aspeed NGI, as it's text mode only.
+- After S5 resume coreboot detects more DIMMs than installed, causing FSP-M
+  to fail.
+
+## Tested and working
+
+- USB ports
+- M.2 2280 NVMe slot
+- 2x 10GB Ethernet
+- SATA
+- RS232
+- VGA on Aspeed
+- Super I/O initialisation
+- ECC DRAM detection
+- PCIe slots
+- TPM on TPM expansion header
+- BMC (IPMI)
+
+## Technology
+
+```eval_rst
++------------------+--------------------------------------------------+
+| CPU              | Intel Kaby Lake                                  |
++------------------+--------------------------------------------------+
+| PCH              | Intel C236                                       |
++------------------+--------------------------------------------------+
+| Super I/O        | ASPEED AST2400                                   |
++------------------+--------------------------------------------------+
+| Coprocessor      | Intel SPS (server version of the ME)             |
++------------------+--------------------------------------------------+
+| Coprocessor      | ASPEED AST2400                                   |
++------------------+--------------------------------------------------+
+```
+
+## Extra links
+
+- [Board manual]
+
+[AST2400]: https://www.aspeedtech.com/products.php?fPath=20&rId=376
+[Board manual]: https://www.supermicro.com/manuals/motherboard/C236/MNL-1783.pdf
+[flashrom]: https://flashrom.org/Flashrom
+[MX25L25635F]: https://media.digikey.com/pdf/Data%20Sheets/Macronix/MX25L25635F.pdf
+[N25Q128A]: https://www.micron.com/~/media/Documents/Products/Data%20Sheet/NOR%20Flash/Serial%20NOR/N25Q/n25q_128mb_3v_65nm.pdf
+[flashing tutorial]: ../../flash_tutorial/ext_power.md
+[Intel FSP2.0]: ../../soc/intel/fsp/index.md
+[Supermicro X11SSH-TF]: https://www.supermicro.com/en/products/motherboard/X11SSH-TF
diff --git a/Documentation/mainboard/supermicro/x11ssh_flash.jpg b/Documentation/mainboard/supermicro/x11ssh_flash.jpg
new file mode 100644
index 0000000000..8ab07f23c7
--- /dev/null
+++ b/Documentation/mainboard/supermicro/x11ssh_flash.jpg