In P4080PCIe BSP's there is a reference to several errata, for which fix in code is provided. For example, one should be described in AN4493, but I can't find it.
Moreover, there is no errata for P4080 part at all. So, does this mean P4080 is error-free chip now?
There is errata for the P4 devices. To access any QorIQ errata you need a non-disclosure agreement with Freescale.
Contact your local FSL sales person to obtain one.