kernel panic with pure usb2umass pluged on pure usb1only motherboard port

[Mathieu PREVOT]

> If you see no "dev.umass*" then I think the device is stuck in attach, 
> or
> something else is wrong.
>
> What does:
>
> camcontrol devlist -v
>
> show before and after you plug/unplug your device ?

BEFORE:

scbus0 on sbp0 bus 0:
<> at scbus0 target -1 lun -1 ()
scbus-1 on xpt0 bus 0:
<> at scbus-1 target -1 lun -1 (xpt0)

WHILE trying connecting:

scbus0 on sbp0 bus 0:
<> at scbus0 target -1 lun -1 ()
scbus0 on sbp0 bus 0:
<USB2.0 ( FS) FLASH DISK 1.00> at scbus1 target 0 lun 0 (da0,pass0)
scbus-1 on xpt0 bus 0:
<> at scbus-1 target -1 lun -1 (xpt0)

AFTER: as BEFORE

I tryed FBSD on a newer hardware (aopen miniPC with P4) - which has 
usb2.0 ports on the motherboard :
- usb is seen as usb1.0
- fatal trap 12 also occur

I did camcontrol devlist -v on that newer hardware.

That was unexpected !

MP