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diff --git a/Documentation/mainboard/index.md b/Documentation/mainboard/index.md index 7507a15bcb..17490643aa 100644 --- a/Documentation/mainboard/index.md +++ b/Documentation/mainboard/index.md @@ -136,6 +136,10 @@ The boards in this section are not real mainboards, but emulators. - [Hermes](prodrive/hermes.md) +## Purism + +- [Librem Mini](purism/librem_mini.md) + ## Protectli - [FW2B / FW4B](protectli/fw2b_fw4b.md) diff --git a/Documentation/mainboard/purism/librem_mini.jpg b/Documentation/mainboard/purism/librem_mini.jpg Binary files differnew file mode 100644 index 0000000000..004235d013 --- /dev/null +++ b/Documentation/mainboard/purism/librem_mini.jpg diff --git a/Documentation/mainboard/purism/librem_mini.md b/Documentation/mainboard/purism/librem_mini.md new file mode 100644 index 0000000000..240dcff2d0 --- /dev/null +++ b/Documentation/mainboard/purism/librem_mini.md @@ -0,0 +1,120 @@ +# Purism Librem Mini + +```eval_rst ++------------------+--------------------------------------------------+ +| CPU | Intel Core i7-8665U | ++------------------+--------------------------------------------------+ +| PCH | Whiskey Lake / Cannon Point LP | ++------------------+--------------------------------------------------+ +| Super I/O, EC | ITE IT8528E | ++------------------+--------------------------------------------------+ +| Coprocessor | Intel Management Engine (CSME 12.x) | ++------------------+--------------------------------------------------+ +``` + + + + +## 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 | ++-----------------+---------------------------------+---------------------+ +| vgabios | VGA Option ROM | Optional | ++-----------------+---------------------------------+---------------------+ +``` + +FSP-M and FSP-S are obtained after splitting the Coffee Lake FSP binary (done +automatically by the coreboot build system and included into the image) from +the `3rdparty/fsp` submodule. + +Microcode updates are automatically included into the coreboot image by the build +system from the `3rdparty/intel-microcode` submodule. Official Purism release +images may include newer microcode, which is instead pulled from Purism's +[purism-blobs] repository. + +VGA Option ROM is not required to boot, but if one needs graphics in pre-OS +stage, it should be included (if not using FSP/GOP display init). It can +be extracted via cbfstool from the existing board firmware or pulled from +the [purism-blobs] repository. + +## Intel Management Engine + +The Librem Mini uses version 12.x of the Intel Management Engine (ME) / +Converged Security Engine (CSE). The ME/CSE is disabled using the High +Assurance Platform (HAP) bit, which puts the ME into a disabled state +after platform bring-up (BUP) and disables all PCI/HECI interfaces. +This can be verified via the coreboot cbmem utility: +`sudo ./cbmem -1 | grep 'ME:'` +provided coreboot has been modified to output the ME status even when +the PCI device is not visible/active (as it is in Purism's release builds). + +## Flashing coreboot + +### Internal programming + +The main SPI flash can be accessed using [flashrom]. The first version +supporting the chipset is flashrom v1.2. Firmware an be easily flashed +with internal programmer (either BIOS region or full image). + +### External programming + +The system has an internal flash chip which is a 8 MiB soldered SOIC-8 chip, +and has a diode attached to the VCC line for in-system programming. +This chip is located on the bottom side of the board under the CPU heatsink, +in line with the front USB 2.0 ports. + +One has to remove all screws (in order): + + * 2 top cover screws + * 4 screws securing the mainboard to the chassis + * 4 screws securing the heatsink/fan assembly to the mainboard (under the SODIMMs) + +The m.2 SSD will need to be removed if the Wi-Fi antenna are connected to +an internal Wi-Fi/BT module. Use a SOIC-8 chip clip to program the chip. +Specifically, it's a Winbond W25Q128JV (3.3V) -[datasheet][W25Q128JV]. + +The EC firmware is stored on a separate SOIC-8 chip (a Winbond W25Q80DV), +but is not protected by a diode and therefore cannot be read/written to without +desoldering it from the mainboard. + +## Known issues + + * SeaBIOS can be finicky with detecting USB devices + * Booting can sometimes hang when a bootsplash image is used with SeaBIOS + and VGA option ROM display init, related to display mode changing + * Issues with some SATA devices have been mitigated by limiting the SATA speed to 3Gbps + until the correct HSIO PHY settings can be determined. + +## Working + + * External displays via HDMI/DislpayPort with VGA option ROM or FSP/GOP init + (no libgfxinit support yet) + * SeaBIOS (1.13.x), Tianocore (CorebootPayloadpkg), Heads (Purism downstream) payloads + * Ethernet, m.2 2230 Wi-Fi + * System firmware updates via flashrom + * PCIe NVMe + * m.2 and SATA III + * Audio via front 3.5mm jack, HDMI, and DisplayPort + * SMBus (reading SPD from DIMMs) + * Initialization with CFL FSP 2.0 + * S3 Suspend/Resume + * Booting PureOS 9.x, Debian 10.x, Qubes 4.0.3, Linux Mint 19.3, Windows 10 2004 + +## Not working / untested + + * ITE IT8528E Super IO functions + + +[Purism Librem Mini]: https://puri.sm/products/librem-mini/ +[purism-blobs] : https://source.puri.sm/coreboot/purism-blobs +[W25Q128JV]: https://www.winbond.com/resource-files/w25q128jv%20revf%2003272018%20plus.pdf +[flashrom]: https://flashrom.org/Flashrom diff --git a/Documentation/mainboard/purism/librem_mini_flash.jpg b/Documentation/mainboard/purism/librem_mini_flash.jpg Binary files differnew file mode 100644 index 0000000000..d1c6071f25 --- /dev/null +++ b/Documentation/mainboard/purism/librem_mini_flash.jpg |
