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fwupd/plugins/flashrom
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Richard Hughes faa7871b08 Remove duplicate ->probe() calls to speed up startup by 150ms 
Now incorporate is fixed to copy across the properties we need in the
superclass, we don't need to do the subclass ->probe().

Note, we still need to do the subclassed ->probe() when using
FU_UDEV_DEVICE_FLAG_VENDOR_FROM_PARENT or when looking at properties
on the parent device.

This also removes the spurious 'already set GType to FuVliUsbhubDevice,
ignoring FuVliUsbhubDevice' messages when running the daemon.
2022-06-14 21:01:57 +01:00
..
example trivial: correct parsing of sample flashrom xml file 2021-04-09 16:02:20 +01:00
flashrom.quirk plugins/flashrom: enable for 2 Tuxedo laptops 2022-04-21 15:39:47 +01:00
fu-flashrom-cmos.c Fix build error when sys/io.h is not available 2021-10-06 20:38:43 +01:00
fu-flashrom-cmos.h plugins/flashrom: Add private flag to reset CMOS 2021-09-10 16:25:32 +01:00
fu-flashrom-device.c Remove duplicate ->probe() calls to speed up startup by 150ms 2022-06-14 21:01:57 +01:00
fu-flashrom-device.h plugins/flashrom: manage flashrom context at plugin level 2022-04-21 15:39:47 +01:00
fu-plugin-flashrom.c Split out the memory helpers to a new source file 2022-06-14 14:36:52 -05:00
meson.build flashrom: Simplify the plugin to remove the indirection 2022-03-09 08:13:13 +00:00
README.md plugins/flashrom: create separate device for ME region 2022-04-21 15:39:47 +01:00

README.md

Flashrom

Introduction

This plugin uses libflashrom to update the system firmware. It can be used to update BIOS or ME regions of the flash. Device for ME region is created only if "Intel SPI" plugin indicates that such a region exists, which makes "Intel SPI" a dependency of this plugin for doing ME updates.

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.

One more GUID has the following form:

  • FLASHROM\VENDOR_{manufacturer}&PRODUCT_{product}&REGION_{ifd_region_name}

Its purpose is to target specific regions of the flash as defined by IFD (Intel SPI Flash Descriptor), examples:

  • FLASHROM\VENDOR_Notebook&PRODUCT_NS50MU&REGION_BIOS
  • FLASHROM\VENDOR_Notebook&PRODUCT_NS50MU&REGION_ME

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

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.