[M] Change in coreboot[main]: Documentation/mainboard/lenovo: Add ThinkCentre M700/M900 Tiny

[Michał Kopeć (Code Review)]

Michał Kopeć has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/87044?usp=email )

Change subject: Documentation/mainboard/lenovo: Add ThinkCentre M700/M900 Tiny
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Documentation/mainboard/lenovo: Add ThinkCentre M700/M900 Tiny

Heavily based on M710s documentation.

Change-Id: I8c3860ba6254919769082c9ed749f8bb287a5f5e
Signed-off-by: Michał Kopeć 
---
M Documentation/mainboard/index.md
A Documentation/mainboard/lenovo/thinkcentre_m900_tiny.md
A Documentation/mainboard/lenovo/thinkcentre_m900_tiny_spi_location.jpg
3 files changed, 90 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/44/87044/1

diff --git a/Documentation/mainboard/index.md b/Documentation/mainboard/index.md
index 870f0c6..00c5e4d 100644
--- a/Documentation/mainboard/index.md
+++ b/Documentation/mainboard/index.md
@@ -186,6 +186,7 @@
 Hardware Maintenance Manual of ThinkPads <lenovo/thinkpad_hmm.md>
 R60 <lenovo/r60.md>
 ThinkCentre M710s <lenovo/thinkcentre_m710s.md>
+ThinkCentre M900 Tiny <lenovo/thinkcentre_m900_tiny.md>
 T4xx common <lenovo/t4xx_series.md>
 X2xx common <lenovo/x2xx_series.md>
 M920 Tiny <lenovo/m920q.md>
diff --git a/Documentation/mainboard/lenovo/thinkcentre_m900_tiny.md b/Documentation/mainboard/lenovo/thinkcentre_m900_tiny.md
new file mode 100644
index 0000000..bd7c72b
--- /dev/null
+++ b/Documentation/mainboard/lenovo/thinkcentre_m900_tiny.md
@@ -0,0 +1,89 @@
+# Lenovo ThinkCentre M700 / M900 Tiny
+
+This page provides technical documentation on [Lenovo ThinkCentre M700 / M900 Tiny].
+
+M700 Tiny and M900 Tiny are twin designs using the same exact mainboard, with
+the following differences:
+
+```{eval-rst}
++------------------------+------+------+
+|        Feature         | M700 | M900 |
++========================+======+======+
+| Chipset                | B150 | Q170 |
++------------------------+------+------+
+| Intel AMT              | No   | Yes  |
++------------------------+------+------+
+| Intel TXT              | No   | Yes  |
++------------------------+------+------+
+| PCIe lanes in M.2 slot | No   | Yes  |
++------------------------+------+------+
+```
+
+## Flash chip
+
+```{eval-rst}
++----------+-----------+
+|   Type   |   Value   |
++==========+===========+
+| Socketed | no        |
++----------+-----------+
+| Model    | W25Q128.V |
+|          | 25L12873F |
++----------+-----------+
+| Size     | 16MiB     |
++----------+-----------+
+| Package  | SOIC-8    |
++----------+-----------+
+```
+
+The flash chip is divided into the following regions.
+
+	00000000:00000fff fd
+	00001000:00002fff gbe
+	00003000:007fffff me
+	00800000:00ffffff bios
+
+## Flashing
+
+The flash chip cannot be flashed internally when running vendor firmware, and must
+be flashed externally using a programmer of your choice.
+
+Steps on how to open the chassis and get access to the mainboard are described
+in the [hardware maintenance manual]. Follow the steps shown from
+"[Removing the computer cover]" until "[Replacing the M.2 storage drive]".
+
+The SPI flash should be easy to identify and the location is shown in the image
+below. See the [datasheet] and [flashing firmware tutorial] for more information.
+
+![](thinkcentre_m900_tiny_spi_location.jpg)
+
+## Status
+
+### Working
+
+ * Debian 12 (Linux 6.1.0) using MrChromebox' EDK II fork
+ * M.2 SATA + NVMe slot
+ * M.2 Wi-Fi slot
+ * Display ports
+ * USB
+ * Audio
+ * LAN
+ * CPU fan
+ * Discrete TPM 1.2
+ * Internal flashing (from coreboot)
+ * COM1 header
+ * DisplayPort header
+ * Power LED
+ * S3 Suspend
+
+### Untested
+
+ * PS/2 header
+ * PCIe + SATA "2L" expansion header
+
+[Lenovo ThinkCentre M700 / M900 Tiny]: https://psref.lenovo.com/syspool/Sys/PDF/ThinkCentre/ThinkCentre_M900_Tiny/T...
+[hardware maintenance manual]: https://download.lenovo.com/pccbbs/thinkcentre_pdf/m700_m900_m900x_tiny_hmm....
+[Removing the computer cover]: https://download.lenovo.com/pccbbs/thinkcentre_pdf/m700_m900_m900x_tiny_hmm....
+[Replacing the M.2 storage drive]: https://download.lenovo.com/pccbbs/thinkcentre_pdf/m700_m900_m900x_tiny_hmm....
+[datasheet]: https://www.winbond.com/hq/product/code-storage-flash-memory/serial-nor-flas...
+[flashing firmware tutorial]: ../../tutorial/flashing_firmware/index.md
diff --git a/Documentation/mainboard/lenovo/thinkcentre_m900_tiny_spi_location.jpg b/Documentation/mainboard/lenovo/thinkcentre_m900_tiny_spi_location.jpg
new file mode 100644
index 0000000..65fdaaa
--- /dev/null
+++ b/Documentation/mainboard/lenovo/thinkcentre_m900_tiny_spi_location.jpg
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