Greetings.
These two patches add support for automatic setting of the serial# environment variable based on OTP fuse settings. Once the serial# field is set then subsequent USB gadget mode instances of WaARP7 will export the serial number based on the OTP fuse settings.
This feature gives a handy output like this:
usb 1-1.1.1: new high-speed USB device number 17 using xhci_hcd usb 1-1.1.1: New USB device found, idVendor=0525, idProduct=a4a5 usb 1-1.1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 1-1.1.1: Product: USB download gadget usb 1-1.1.1: Manufacturer: FSL usb 1-1.1.1: SerialNumber: WaRP7-0xf42400d3000001d4
The 64 bit value post-fixed to the WaARP7 string is based on OTP fuses which provide a unique serial number for each NXP i.MX7 SoC.
We make use of this feature when discerning a unique identifier for WaARP7 boards in our automated LAVA testing environment, hopefully its useful and acceptable to others.
Bryan O'Donoghue (2): warp7: usb: Introduce a get method for serial number warp7: usb: Set u-boot serial# based on OTP value
board/warp7/warp7.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+)