• Limit BCM5701 B5 to 32-bit mode as a workaround for a bug which causes data corruption in combination with certain bridges. Information about this problem was kindly provided by davidch. [1]
• As BGE_FLAG_PCIX is meant to indicate that the controller is in PCI-X mode, revert to the pre __FreeBSD_version 602101 method of reading the bus mode register rather than checking the mere existence of a PCI-X capability, which is also there when the NIC f.e. is put into a 32-bit slot causing it not to be in PCI-X mode. Setting BGE_FLAG_PCIX inappropriately could cause the NIC to be tuned incorrectly.

PR: 128833 [1]
Reviewed by: jhb
MFC after: 3 days