fe073a304d
Created lspcon-i2c-spi flashrom device that uses udev to detect i2c devices that can be updated with the lspcon-i2c-spi flashrom programmer. This change implements the logic from crrev.com/c/2792124 adapted to the upstream flashrom plugin.
2.3 KiB
Flashrom
Introduction
This plugin uses flashrom to update the system firmware.
Firmware Format
The daemon will decompress the cabinet archive and extract a firmware blob in an unspecified binary file format, which is typically the raw input for an EEPROM programmer.
This plugin supports the following protocol ID:
- org.flashrom
Coreboot Version String
The coreboot version string can have an optional prefix (see below). After the optional prefix the major, minor string follows and finally the build string, containing the exact commit and repository state, follows.
For example 4.10-989-gc8a4e4b9c5-dirty
Exception on Lenovo devices:
The thinkpad_acpi kernel module requires a specific pattern in the DMI version string. To satisfy those requirements coreboot adds the CBETxxxx prefix to the DMI version string on all Lenovo devices.
For example CBET4000 4.10-989-gc8a4e4b9c5-dirty
The coreboot DMI version string always starts with CBET.
GUID Generation
Internal device uses hardware ID values which are derived from SMBIOS.
- HardwareID-3
- HardwareID-4
- HardwareID-5
- HardwareID-6
- HardwareID-10
They should match the values provided by fwupdtool hwids or the
ComputerHardwareIds.exe Windows utility.
lspcon-i2c-spi devices use the customized DeviceInstanceId values, e.g.
- FLASHROM-LSPCON-I2C-SPI\VEN_1AF8&DEV_0175
Update Behavior
The firmware is deployed to the SPI chip when the machine is in normal runtime mode, but it is only used when the device is rebooted.
Vendor ID Security
The vendor ID is set from the BIOS vendor, for example DMI:Google
Quirk use
This plugin uses the following plugin-specific quirks:
| Quirk | Description | Minimum fwupd version |
|---|---|---|
FlashromProgrammer |
Used to specify the libflashrom programmer to be used. | 1.5.9 |
External interface access
This plugin requires access to all interfaces that libflashrom has been compiled for.
This typically is /sys/bus/spi but there may be other interfaces as well.