An early driver build running on a PCIe 802.11n adapter
A tester applied pre-release driver patches to a laptop's wireless tree and found that its PCIe three-stream 802.11n adapter came up and worked, after a small local change.
The boot log showed a configuration-memory checksum warning. The tester made the driver carry on instead of stopping at that check, which allowed the card to initialise and scan normally.
Takeaway. Early drivers often print warnings that are harmless on a particular board. A checksum message in the log is a clue to check, not always the cause of a failure.