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Flash programming over JTAG for Xilinx FPGA devices is done using "SPI indirect" method - FPGA is loaded with JTAG to SPI gateway bit stream, and then JTAG is used to talk to the SPI flash.

Xilinx Vivado Programmer does this transparently it is not visible to the user.

 

 

 

Quad Enable Bit

For SPI Flash use in x4 mode Quad Enable bit must be set in nonvolatile Status Register. The commands for this depend the SPI Flash Vendor and/or Flash type. Vivado Flash Programmer when programming bit file generated with X4 option would set this bit automatically. All Trenz SoM's that need the Quad Enable bit set for proper operation are delivered with this bit set.

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