Replicant

h1. OmapUsbBootCheckSignedSOC

h3. How to check with command line utilities

To get the bootrom to try to boot on USB, you need to do the following:

* Connect the USB cable to the device but make sure it's not connected on the computer.

* Power off the device

* Connect the USB cable

If we do that, we get the following in the kernel log of your laptop:

<pre>

usb 1-1: new high-speed USB device number 24 using ehci-pci

usb 1-1: unable to get BOS descriptor or descriptor too short

usb 1-1: New USB device found, idVendor=0451, idProduct=d00f, bcdDevice= 0.00

usb 1-1: New USB device strings: Mfr=33, Product=37, SerialNumber=0

usb 1-1: Product: OMAP4430

usb 1-1: Manufacturer: Texas Instruments

</pre>

Note that your kernel might need to be compiled with CONFIG_USB_ANNOUNCE_NEW_DEVICES=y

to print that. In Parabola CONFIG_USB_ANNOUNCE_NEW_DEVICES=y is enabled.

We can also try to get a bit more infos with omap-usb-boot:

<pre>

$ sudo omap-usb-boot -v -w boot invalidbootmedia

Finding and opening USB device

Found and opened omap4 USB device: OMAP4430

ASIC device id: 4430, HS device

Booting from device invalidbootmedia...

Booting device invalidbootmedia not found

Booting from device failed

</pre>

Here we know the device is signed because it's a "HS device".

If it was not signed it would print "GP device" instead.