I made some additional tests:
One JoyWarrior controller either USB2 or USB3 works. Both controllers @2+3: continuously 2 beeps per second, no boot (the chips are normally used in joysticks, here they are used to register switch positions).
USB HUB (EXSYS "EX-1177HMV") @ internal / USB Bracket: List of boot devices appears but no keyboard available -> no boot. (no bootable device is attached to the HUB!)
Everything connected: Beeps + bootlist with no Keyboard...
Also to be stated:
Everything works well if attached after boot (so nothing seems to be defect)
Both JoyWarrior chips have been attached previously at a Tyan Toledo T35q without any problems.
The RMM3 is not yet delivered.
I tried another option still without success:
Keyboard & Mouse still connected @ USB0+1, everything else connected to the HUB, the HUB connected to USB3. Same issue: continuosly 2 beeps / sec. (I get 21 beeps, then a beep-beep and 21 again and so on). The board starts with beeping while the "...continue..." countdown is displayed. The board doesn't boot. Beeping stops, after pulling the USB plug at once. Again: everything works fine, if the USB is plugged in while the OS is starting.
I see no sense to install a RMM3 module if this problem is not fixed. Nobody is there to unplug and plug the USB.
Nobody here who can help?