![]() cros-ec firmware are in fmap layout, and have two sections that this plugin will look for, the EC_RO, and EC_RW sections. Tested using a servo_micro firmware: $ fwupdtool firmware-parse servo_micro_v2.4.17-df61092c3.bin <select fmap option> FuCrosEcFirmware: Version: 2.4.17 FuFirmwareImage: ID: EC_RO Index: 0x1 Version: servo_micro_v2.4.17-df61092c3 Data: 0xf000 FuFirmwareImage: ID: FR_MAIN Index: 0x2 Data: 0xf000 FuFirmwareImage: ID: RO_FRID Index: 0x3 Address: 0xc4 Data: 0x20 FuFirmwareImage: ID: FMAP Index: 0x4 Address: 0x9a40 Version: 1.0 Data: 0x15e FuFirmwareImage: ID: WP_RO Index: 0x5 Data: 0x10000 FuFirmwareImage: ID: EC_RW Index: 0x6 Address: 0x10000 Version: servo_micro_v2.4.17-df61092c3 Data: 0x10000 FuFirmwareImage: ID: RW_FWID Index: 0x7 Address: 0x100c4 Data: 0x20 |
||
---|---|---|
.. | ||
data | ||
cros-ec.quirk | ||
fu-cros-ec-common.c | ||
fu-cros-ec-common.h | ||
fu-cros-ec-firmware.c | ||
fu-cros-ec-firmware.h | ||
fu-cros-ec-usb-device.c | ||
fu-cros-ec-usb-device.h | ||
fu-plugin-cros-ec.c | ||
meson.build | ||
README.md |
Chrome OS EC Support
Introduction
This plugin provides support for the firmware updates for Chrome OS EC project based devices.
Initially, it supports the USB endpoint updater, but lays the groundwork for future updaters which use other update methods other than the USB endpoint.
This is based on the chromeos ec project's usb_updater2 application [1].
Information about the USB update protocol is available at [2].
Firmware Format
The plugin at the moment does not support a firmware payload, but will
support the Google firmware format used in Chrome OS firmware
known as flashmap
[3].
GUID Generation
These devices use the standard USB DeviceInstanceId values, e.g.
USB\VID_18D1&PID_501A
Vendor ID Security
The vendor ID is set from the USB vendor, which is set to various different values depending on the model and device mode. The list of USB VIDs used is:
USB:0x18D1
[1] https://chromium.googlesource.com/chromiumos/platform/ec/+/master/extra/usb_updater/usb_updater2.c [2] https://chromium.googlesource.com/chromiumos/platform/ec/+/master/docs/usb_updater.md [3] https://www.chromium.org/chromium-os/firmware-porting-guide/fmap