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linuxboot / heads

A minimal Linux that runs as a coreboot or LinuxBoot ROM payload to provide a secure, flexible boot environment for laptops, workstations and servers.
https://osresearch.net/
GNU General Public License v2.0
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Add support for Acer Chromebook 515 Plus (CB515-2H) / Google Omnigul Platform #1663

Open mdrobnak opened 2 months ago

mdrobnak commented 2 months ago

Add support for the Acer Chromebook 515 Plus - CB515-2H, also known as the Google Omnigul / Brya.

lspci output:

00:00.0 Host bridge: Intel Corporation Device 4609 (rev 04)
00:02.0 VGA compatible controller: Intel Corporation Alder Lake-UP3 GT1 [UHD Graphics] (rev 0c)
00:04.0 Signal processing controller: Intel Corporation Alder Lake Innovation Platform Framework Processor Participant (rev 04)
00:08.0 System peripheral: Intel Corporation 12th Gen Core Processor Gaussian & Neural Accelerator (rev 04)
00:0a.0 Signal processing controller: Intel Corporation Platform Monitoring Technology (rev 01)
00:0d.0 USB controller: Intel Corporation Alder Lake-P Thunderbolt 4 USB Controller (rev 04)
00:12.0 Serial controller: Intel Corporation Alder Lake-P Integrated Sensor Hub (rev 01)
00:12.7 Universal Flash Storage controller: Intel Corporation Device 51ff (rev 01)
00:14.0 USB controller: Intel Corporation Alder Lake PCH USB 3.2 xHCI Host Controller (rev 01)
00:14.2 RAM memory: Intel Corporation Alder Lake PCH Shared SRAM (rev 01)
00:14.3 Network controller: Intel Corporation Alder Lake-P PCH CNVi WiFi (rev 01)
00:15.0 Serial bus controller: Intel Corporation Alder Lake PCH Serial IO I2C Controller #0 (rev 01)
00:15.1 Serial bus controller: Intel Corporation Alder Lake PCH Serial IO I2C Controller #1 (rev 01)
00:15.3 Serial bus controller: Intel Corporation Alder Lake PCH Serial IO I2C Controller #3 (rev 01)
00:16.0 Communication controller: Intel Corporation Alder Lake PCH HECI Controller (rev 01)
00:19.0 Serial bus controller: Intel Corporation Alder Lake-P Serial IO I2C Controller #0 (rev 01)
00:19.1 Serial bus controller: Intel Corporation Alder Lake-P Serial IO I2C Controller #1 (rev 01)
00:1e.0 Communication controller: Intel Corporation Alder Lake PCH UART #0 (rev 01)
00:1e.3 Serial bus controller: Intel Corporation Alder Lake SPI Controller (rev 01)
00:1f.0 ISA bridge: Intel Corporation Alder Lake PCH eSPI Controller (rev 01)
00:1f.3 Multimedia audio controller: Intel Corporation Alder Lake PCH-P High Definition Audio Controller (rev 01)
00:1f.5 Serial bus controller: Intel Corporation Alder Lake-P PCH SPI Controller (rev 01)

Work already being done in https://github.com/linuxboot/heads/pull/1658.

mdrobnak commented 1 month ago

Lifecycle Extension Guide from Acer - Shows how to disassemble parts of the laptop. [

Flash chip is on underside of board.

WSON8 6x8 mm probe necessary to unlock flash descriptor.

flashrom in Ubuntu 23.10 can reach chip using external programmer.

ifdtool used to unlock flash descriptor and enable HAP bit.

flashroom used to flash modified descriptor and machine boots fine.