[Solved] Atheros AR9462 on x86 as an AP - can not get it to work at all

This PCI ID is guarded by the ATH9K_SUPPORT_PCOEM config symbol, which is not enabled by default (in order to trim down ath9k module size for non-x86 devices). You will have to rebuild OpenWrt with it enabled - and it probably makes sense to enable it by default for the various x86 subtargets.