This implements the following simple state machine:
1. Reboot to RO, Update RW first, set ANOTHER_WRITE_REQUIRED
2. Second time around, don't reboot into RO. Stay in RW.
3. Update RO.
4. Done.
Write the firmware to the usb device, first finding which section to
write to, then breaking into blocks (based on maximum pdu size),
and then into chunks, which are transferred to the device using bulk transfers.
Provide the following metadata:
"Dirty firmware" bit
Protocol version
Header type
Maximum PDU Size
Flash protection status
Raw version string
Key Version
Minimum rollback
This should do the bulk transfers using protocol 6.
The output here is now equivalent to the output of
usb_updater2 -d 18d1:501a -f
fwupdtool --plugin-whitelist cros_ec get-devices --verbose
Servo Micro
DeviceId: 84d0e3f2a0f8b2328f7995767b23ebb40494723f
Guid: 8e2f7625-a164-55d7-8f09-f193c8ec33f1 <- USB\VID_18D1&PID_501A&REV_0100
Guid: 13564257-c649-586d-b4e4-4f048d480f36 <- USB\VID_18D1&PID_501A
Serial: CMO653-00166-040491U00771
Summary: Servo Micro (aka "uServo") Debug Board
Plugin: cros_ec_usb
Flags: registered
Vendor: Google Inc.
VendorId: USB:0x18D1
Version: servo_micro_v2.4.17-df61092c3
VersionFormat: plain
Created: 2020-05-20
PhysicalId: usb:03:00:02