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Sub-device information is retrieved from the JTAG ID in Boot Scratch Cold 4 Register. This interface is introduced to allow device-specific errata workarounds to be applied in the future, based on the detected sub-device type. Signed-off-by: Tingting Meng <tingting.meng@altera.com> Reviewed-by: Tien Fong Chee <tien.fong.chee@intel.com>