This answer record serves as the Vivado 2014.4 tool update (2014.4.1) Release Notes and contains links to information about what is included in the update.
The Vivado 2014.4 tool update (2014.4.1) addresses the following issues:
Note: This update is only required for users targeting UltraScale devices.
Downloading and installing the Vivado 2014.4 update (2014.4.1)
Known issues specific to Vivado 2014.4.1
|(Xilinx Answer 63696)||Running write_bitstream with Authentication and Encryption bitstream options results in a crash if required files are not present|
|(Xilinx Answer 63698)||Using ILA cores will show Hold slack violation which can safely be ignored|
|(Xilinx Answer 63596)||MIG UltraScale - HOLD violations might be seen when using 2014.4.1|
For Vivado 2014.4 known issues (likely also to apply to Vivado 2014.4.1) see: (Xilinx Answer 59464)
For known issues related to a specific IP, please search the support site for "Known Issues" and the IP name.