4d9dfb63bd
The old wiki no longer exists (see the announcement at [1]), the current URLs lead to an HTTP 404. To fix it, replace the URLs with the main page URL, which contains links to the current documentation, manual, etc. [1]: https://mail.coreboot.org/hyperkitty/list/flashrom@flashrom.org/thread/GNT23GQEQ5I5JCJ6YKUSRXD7JORSG4RV/ Change-Id: Ifb430a033d12f8064893f75315d577b5e78ffc9e Signed-off-by: Raphaël Mélotte <raphael.melotte@mind.be> Reviewed-on: https://review.coreboot.org/c/coreboot/+/88072 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Maximilian Brune <maximilian.brune@9elements.com> Reviewed-by: Yidi Lin <yidilin@google.com>
4 KiB
Lenovo M920 Tiny
This page describes how to run coreboot on Lenovo M920 Tiny (M920q, M920x).
Technology
+------------+---------------------------------------------------------------+
| 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
+---------------------+--------------------------+
| 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!