mirror of
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6fdae41ae0
For a while we flirted with the idea of updating non-internal libflashrom-derived devices but the impedance mismatch was just too great. We removed the extra unused subclasses of FuFlashromDevice, but never removed the indirection we added for the writing. Remove the unused code now that we agree on the longer term plan.
61 lines
1.7 KiB
Markdown
61 lines
1.7 KiB
Markdown
# Flashrom
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## Introduction
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This plugin uses `flashrom` to update the system firmware.
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## Firmware Format
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The daemon will decompress the cabinet archive and extract a firmware blob in
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an unspecified binary file format, which is typically the raw input for an
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EEPROM programmer.
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This plugin supports the following protocol ID:
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* org.flashrom
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## Coreboot Version String
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The coreboot version string can have an optional prefix (see below).
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After the optional prefix the *major*, *minor* string follows and finally
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the *build string*, containing the exact commit and repository state, follows.
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For example `4.10-989-gc8a4e4b9c5-dirty`
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### Exception on Lenovo devices
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The thinkpad_acpi kernel module requires a specific pattern in the DMI version
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string. To satisfy those requirements coreboot adds the CBETxxxx prefix to the
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DMI version string on all Lenovo devices.
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For example `CBET4000 4.10-989-gc8a4e4b9c5-dirty`
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The coreboot DMI version string always starts with `CBET`.
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## GUID Generation
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Internal device uses hardware ID values which are derived from SMBIOS.
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* HardwareID-3
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* HardwareID-4
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* HardwareID-5
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* HardwareID-6
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* HardwareID-10
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They should match the values provided by `fwupdtool hwids` or the
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`ComputerHardwareIds.exe` Windows utility.
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## Update Behavior
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The firmware is deployed to the SPI chip when the machine is in normal runtime
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mode, but it is only used when the device is rebooted.
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## Vendor ID Security
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The vendor ID is set from the BIOS vendor, for example `DMI:Google`
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## External Interface Access
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This plugin requires access to all interfaces that `libflashrom` has been compiled for.
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This typically is `/sys/bus/spi` but there may be other interfaces as well.
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