078beafb2d
It is far too easy to forget to set FWUPD_DEVICE_FLAG_NO_GUID_MATCHING for new
plugins, and without it it all works really well *until* a user has two devices
of the same type installed at the same time and then one 'disappears' for hard
to explain reasons. Typically we only need it for replug anyway!
Explicitly opt-in to this rarely-required behaviour, with the default to just
use the physical and logical IDs. Also document the update behavior for each
plugin to explain why the flag is being used.
This allows you to have two identical Unifying plugged in without one of them
being hidden from the user, at the same time allowing a HIDRAW<->USB transition
when going to and from bootloader and runtime modes.
This removes the workaround added in 99eb3f06b6.
Fixes https://github.com/fwupd/fwupd/issues/2915
1.4 KiB
SuperIO
This plugin enumerates the various ITE85* SuperIO embedded controller ICs found
in many laptops. Vendors wanting to expose the SuperIO functionality will need
to add a HwId quirk entry to superio.quirk.
See https://en.wikipedia.org/wiki/Super_I/O for more details about SuperIO and what the EC actually does.
Other useful links:
- https://raw.githubusercontent.com/system76/ecflash/master/ec.py
- https://github.com/system76/firmware-update/tree/master/src
- https://github.com/coreboot/coreboot/blob/master/util/superiotool/superiotool.h
- https://github.com/flashrom/flashrom/blob/master/it85spi.c
- http://wiki.laptop.org/go/Ec_specification
GUID Generation
These devices use a custom GUID generated using the SuperIO chipset name:
SuperIO-$(chipset), for exampleSuperIO-IT8512
Update Behavior
The firmware is deployed when the device is in normal runtime mode, but it is only activated on machine reboot. The firware write is normally scheduled to be done very early in the boot process to minimize the chance the EC chip locking up if the user is actually using the kerboard controller.
Vendor ID Security
The vendor ID is set from the baseboard vendor, for example DMI:Star Labs
External interface access
This plugin requires access to raw system memory via inb/outb.