rpiboot hangs if CM4 is already booted about usbboot HOT 4 CLOSED

A CM4 (or any USB-bootable device) waiting for USB boot presents itself as a USB device/gadget over the OTG USB port. After the 2nd stage bootloader (bootcode*.bin) has been sent it appears as a different USB device because it is now running a different USB stack. If the downloaded image is to activate Mass Storage Device mode then you get a third kind of device - MSD.

The standard way to program a batch of devices is to run rpiboot in a loop, allowing it to detect new devices as they are attached. It is not possible to distinguish between a CM4 running an image which doesn't present a USB gadget and no CM4 - they look just the same, i.e. an absence of a USB device.

The CM4 hardware is working the way we want it to work, and unfortunately it doesn't support the features you think are important. If you want to switch to a mode where you attach a CM4 before starting rpiboot and get an error message about there being no device attached then you just need to write a wrapper script that runs lsusb and complains if it doesn't find something bootable. Alternatively you might be able to arrange that your custom images create yet another kind of USB gadget, which would then be able to be detected by your wrapper. Either way, we won't be changing the rpiboot source, but you can always fork it yourself - that's the beauty of open source software!

from usbboot.

If your aim is batch programming, you may be interested in the CM Provisioner which can work over USB or ethernet, depending on the target.

https://github.com/raspberrypi/cmprovision

from usbboot.

Wow. I didn't expect such a rebuff.

Of course I can write a wrapper to steer around the flaw. (As anybody else of the
thousands of admins out there can do . )

However. It'd be much simpler to introduce a very ,I'd expect , minor change to the program.
Instead of having a program stalling forever it could simply bail out after a couple of seconds.

I am just saying.

Anyhow. Thx for listening.

from usbboot.

The code is here to view - tell me how it should work?

from usbboot.