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ALi's USB uses other than INTA#.

Dear experts,

 I use ALi M1543 south bridge which have an USB function block inside.
An Ethernet device is also on the motherboard, not on a adaptor board.
INTA# pin of the Ethernet is tied to INTA# pin of M1543. The spec book
of ALi tells that USB uses INTA#. But sometimes I can see that the system
bios gives different IRQn to the USB and the Ethernet.
PIC in M1543 can do that?
Any comment would be apprecisated.

Best regards,
Takashi Nakamura
Yokogawa Electric Corporation