install/51794: NetBSD/sparc64 7.0.2 on Blade 2500 - Trouble on install

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>Number:         51794
>Category:       install
>Synopsis:       NetBSD/sparc64 7.0.2 on Blade 2500 - Trouble on install
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    install-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Jan 07 18:05:00 +0000 2017
>Originator:     Maurizio Caltabiano
>Release:        7.0.2
>Organization:
Maurizio Caltabiano
>Environment:
sun4u
>Description:
The goal is to move from Solaris 10 to NetBSD, but after "boot cdrom", the procees of check of hardware is goimg on till the message "uhub#: device problem, disabling port 1" and at the next one "uhub#: device problem, disabling port 2" the system is freezed. At the first I keep out the USB 2.0 and firewire board on PCI, but I understood the trouble was on mainboard USB ports (working well with mouse and keyboard on Solaris and before launching "boot cdrom")
>How-To-Repeat:
Please launch the 7.0.2 on a standard Sun Blade 2500 Red
>Fix: