In the installed system, run 'lspci | grep -i usb', this gives the pci
bus numbers. Then run 'find /sys -name devspec', and look or the bus
numbers from the lspci output. Each devspec file contains the firmware
path. The ohci node may have subdirectories. Run 'words' in each of
them at the firmware prompt. Perhaps there is one to shutdown the
controller?
I just noticed older firmware did not have a node for ohci, newer ones
my have a /pci@80000000/usb@5 node.
Good luck.
Olaf
--
