# 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/