I have a strange issue with the gigabit ethernet support on a 5510.
Table 9 in this document http://www.cisco.com/en/US/docs/security/asa/asa82/license/license82.html states that support for gigabit interfaces in the Base License was added in 8.0.4.
I have a number of 5510's and none of them support gigabit interfaces with 8.0.4. However, they all support gigabit ethernet in 8.0.3.
I searched in the Bug Tool Kit to see if this was a filed defect and I could not find anything. Has anyone else ran into this issue. I'd be interested in hearing from someone in the ASA team at Cisco to know if this is an open defect that is fixed in an interim build or just what the status is.