mb/libretrend/lt1000: Add Libretrend LT1000 mainboard

Change-Id: I32fc8a7d3177ba379d04ad8b87adefcfca2b0fab
Signed-off-by: Michał Żygowski <michal.zygowski@3mdeb.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/30360
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Frans Hendriks <fhendriks@eltan.com>

1 files changed, 117 insertions, 0 deletions

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+# Libretrend LT1000
+
+This page describes how to run coreboot on the [Libretrend LT1000] (aka
+Librebox).
+
+![](lt1000.jpg)
+
+## Required proprietary blobs
+
+To build a minimal working coreboot image some blobs are required (assuming
+only the BIOS region is being modified).
+
+```eval_rst
++-----------------+---------------------------------+---------------------+
+| Binary file     | Apply                           | Required / Optional |
++=================+=================================+=====================+
+| FSP-M, FSP-S    | Intel Firmware Support Package  | Required            |
++-----------------+---------------------------------+---------------------+
+| microcode       | CPU microcode                   | Required            |
++-----------------+---------------------------------+---------------------+
+```
+
+FSP-M and FSP-S are obtained after splitting the Kaby Lake FSP binary (done
+automatically by coreboot build system and included into the image) from the
+*3rdparty/fsp* submodule.
+
+Microcode updates are automatically included into the coreboot image by build
+system from the *3rdparty/intel-microcode* submodule.
+
+The mainboard code also contains a VBT file (version 1.00, BDB version 2.09)
+which is automatically included into the image by coreboot build system.
+
+## Flashing coreboot
+
+### Internal programming
+
+The main SPI flash can be accessed using [flashrom]. It is strongly advised to
+flash only the BIOS region if not having an external programmer, see known
+issues.
+
+### 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 near the CPU fan,
+between the DIMM slots and the M.2 disk. Use a clip (or solder the wires) to
+program the chip. Specifically, it's a Winbond W25Q64FV (3.3V) -
+[datasheet][W25Q64FV].
+
+## Known issues
+
+- Fastboot (MRC cache) is not working reliably (missing schematics for CPU to
+  DIMM wiring).
+- Flashing ME region with already cleaned ME firmware may lead to platform not
+  booting, flashing full ME firmware is needed to recover.
+- In order to have the USB device wake support from S3 state using the front
+  USB 3.0 ports, one has to move the jumper on DUSB1_PWR_SET header (it will
+  switch the power rails for the USB 3.0 ports).
+- There are 6 unknown GPIO pins on the board.
+
+## Untested
+
+Not all mainboard's peripherals and functions were tested because of lack of
+the cables or not being populated on the board case.
+
+- LVDS header
+- Onboard USB 2.0 and USB 3.0 headers
+- Speakers and mic header
+- SPDIF header
+- Audio header
+- PS/2 header
+- LPT header
+- CIR (infrared header)
+- COM2 port RS485 mode (RS232/RS485 mode is controlled via jumper)
+- SYS_FAN header
+
+## Working
+
+- USB
+- Ethernet
+- Integrated graphics (with libgfxinit) on VGA and HDMI ports
+- flashrom
+- PCIe
+- NVMe
+- WiFi and Bluetooth
+- SATA
+- Serial ports 1-6
+- SMBus
+- HDA (verbs not implemented yet, but works under GNU/Linux (4.15 tested))
+- Initialization with KBL FSP 2.0
+- SeaBIOS payload (version rel-1.13.0)
+- TPM2 ([custom module] connected to LPC DEBUG header)
+- Automatic fan control
+- Platform boots with cleaned ME (MFS partition must be left on SPI flash)
+
+## Technology
+
+The platform contains an LR-i7S65T1 baseboard (LR-i7S65T2 with two NICs not
+sold yet). More details on [baseboard site]. Unfortunately the board manual is
+not publicly available.
+
+```eval_rst
++------------------+--------------------------------------------------+
+| CPU              | Intel Core i7-6500U                              |
++------------------+--------------------------------------------------+
+| PCH              | Skylake-U Premium                                |
++------------------+--------------------------------------------------+
+| Super I/O        | ITE IT8786E                                      |
++------------------+--------------------------------------------------+
+| Coprocessor      | Intel Management Engine                          |
++------------------+--------------------------------------------------+
+```
+
+[Libretrend LT1000]: https://libretrend.com/specs/librebox/
+[W25Q64FV]: https://www.winbond.com/resource-files/w25q64fv%20revs%2007182017.pdf
+[flashrom]: https://flashrom.org/Flashrom
+[baseboard site]: http://www.minicase.net/product_LR-i7S65T1.html
+[custom module]: https://shop.3mdeb.com/product/tpm2-module-for-librebox/