diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/mainboard/index.md | 1 | ||||
| -rw-r--r-- | Documentation/mainboard/lenovo/m920q.md | 102 |
2 files changed, 103 insertions, 0 deletions
diff --git a/Documentation/mainboard/index.md b/Documentation/mainboard/index.md index 3cae8f18fb..468e3c2cd1 100644 --- a/Documentation/mainboard/index.md +++ b/Documentation/mainboard/index.md @@ -176,6 +176,7 @@ Hardware Maintenance Manual of ThinkPads <lenovo/thinkpad_hmm.md> R60 <lenovo/r60.md> T4xx common <lenovo/t4xx_series.md> X2xx common <lenovo/x2xx_series.md> +M920 Tiny <lenovo/m920q.md> vboot <lenovo/vboot.md> ``` diff --git a/Documentation/mainboard/lenovo/m920q.md b/Documentation/mainboard/lenovo/m920q.md new file mode 100644 index 0000000000..092aebf1b3 --- /dev/null +++ b/Documentation/mainboard/lenovo/m920q.md @@ -0,0 +1,102 @@ +# Lenovo M920 Tiny + +This page describes how to run coreboot on Lenovo M920 Tiny (M920q, M920x). + +## Technology + +```{eval-rst} ++------------+---------------------------------------------------------------+ +| CPU | Intel Core 8th Gen or 9th Gen (Coffee Lake (Refresh)) | ++------------+---------------------------------------------------------------+ +| DRAM | 2 SO-DIMM slots, DDR4-2400/2666 | ++------------+---------------------------------------------------------------+ +| Chipset | Intel Q370 | ++------------+---------------------------------------------------------------+ +| Super I/O | NCT6686D-L | ++------------+---------------------------------------------------------------+ +| TPM | Infineon SLB 9670VQ2.0 | ++------------+---------------------------------------------------------------+ +| Boot | USB, SATA (on-board SATA1 port, M.2 ports), NVMe | ++------------+---------------------------------------------------------------+ +| Power | 65-135 W power adapter | ++------------+---------------------------------------------------------------+ +``` + +More specifications on [Lenovo M920 Tiny specifications]. + +## Flashing coreboot + +```{eval-rst} ++---------------------+--------------------------+ +| Type | Value | ++=====================+==========================+ +| Socketed flash | no | ++---------------------+--------------------------+ +| Model | W25Q128JV + W25Q64JV | ++---------------------+--------------------------+ +| Size | 16 + 8 MiB | ++---------------------+--------------------------+ +| Package | SOIC-8 + SOIC-8 | ++---------------------+--------------------------+ +| Write protection | chipset PRR | ++---------------------+--------------------------+ +| Dual BIOS feature | no | ++---------------------+--------------------------+ +| Internal flashing | after flashing coreboot | ++---------------------+--------------------------+ +``` + +### Internal programming + +The SPI flash can be accessed using [flashrom]. + + flashrom -p internal -N -w coreboot.rom --ifd -i bios + +Internal programming can be used after the coreboot has been flashed externally +for the first time. Internal programming when migrating from original UEFI +firmware **has not been tested**. + +### External programming + +The external access to flash chip is available through standard SOP-8 clip. The +voltage of both SPI chips is 3.3V. + +It is recommended to flash firmware without supplying power from power adapter. + +The resulting coreboot.rom file must be split into two binaries, one for each +flash chip: + + dd if=build/coreboot.rom of=build/coreboot_flash_1.rom bs=16M count=1 + dd if=build/coreboot.rom of=build/coreboot_flash_2.rom bs=8M skip=2 + +The flash chips are marked on the mainboard as BIOS1 and BIOS2 respectively. +They can be flashed with following commands: + + flashrom -p ch341a_spi -w build/coreboot_flash_1.rom + flashrom -p ch341a_spi -w build/coreboot_flash_2.rom -c "W25Q64JV-.Q" + +## Known issues + +- front audio jacks do not work + +## Working + +Tested with edk2 payload (mrchromebox) and Ubuntu 22.04 (Linux 6.2.0): + +- Serial adapter from daughter board (COM1 connector) +- USB 3.0 and 2.0 rear and front ports (edk2 and Linux 6.2.0) +- USB-C port (charging, data) +- Gigabit Ethernet +- SATA +- internal speaker +- TPM2.0 +- WiFi slot +- HDMI +- NVMe +- PCIe x8 port + - PCIe x8 tested using BA7H70 Rev 1.2 riser and Intel X540-T2 10G dual 10GbE card + - another riser with PCIe x4 connector remains untested - please modify this + page if you do test it! + +[flashrom]: https://flashrom.org/Flashrom +[Lenovo M920 Tiny specifications]: https://psref.lenovo.com/syspool/Sys/PDF/ThinkCentre/ThinkCentre_M920_Tiny/ThinkCentre_M920_Tiny_Spec.PDF |