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Joel Stanley 60e5f7b958 spi: Fix dat_i_l constraints 
No cells matched 'get_cells -hierarchical -filter {NAME =~*/spi_rxtx/dat_i_l*}'. [build/microwatt_0/src/microwatt_0/fpga/arty_a7.xdc:42]

The signal is in it's own process so the net name ends up being
spi_rxtx/input_delay_1.dat_i_l_reg.

After this change the log shows:

Applied set_property IOB = TRUE for soc0/\spiflash_gen.spiflash /spi_rxtx/\input_delay_1.dat_i_l_reg . (constraint file  fpga/arty_a7.xdc, line 42).
Applied set_property IOB = TRUE for soc0/\spiflash_gen.spiflash /spi_rxtx/\input_delay_1.dat_i_l_reg . (constraint file  fpga/arty_a7.xdc, line 42).
Applied set_property IOB = TRUE for soc0/\spiflash_gen.spiflash /spi_rxtx/\input_delay_1.dat_i_l_reg . (constraint file  fpga/arty_a7.xdc, line 42).
Applied set_property IOB = TRUE for soc0/\spiflash_gen.spiflash /spi_rxtx/\input_delay_1.dat_i_l_reg . (constraint file  fpga/arty_a7.xdc, line 42).

Signed-off-by: Joel Stanley <joel@jms.id.au>
..
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arty_a7.xdc spi: Fix dat_i_l constraints
clk_gen_bypass.vhd Fix clk_gen_bypass
clk_gen_mcmm.vhd Improve PLL/MMCM clocks configuration
clk_gen_plle2.vhd Improve PLL/MMCM clocks configuration
cmod_a7-35.xdc Add SPI configuration to Xilinx constraint files
firmware.hex Add a few more FPGA related files
hello_world.hex hello_world: Use new headers and frequency from syscon
main_bram.vhdl Fix some ghdlsynth issues with fpga_bram
nexys-video.xdc spi: Add SPI Flash controller
nexys_a7.xdc Add SPI configuration to Xilinx constraint files
pp_fifo.vhd pp_fifo: Fix full fifo losing all data on simultaneous push & pop
pp_soc_uart.vhd uart: Remove combinational loops on ack and stall signal
pp_utilities.vhd
…
soc_reset.vhdl soc_reset: Use counters, add synchronizers
soc_reset_tb.vhdl Exit cleanly from testbench on success
top-arty.vhdl Merge pull request from paulusmack/faster
top-generic.vhdl soc: Don't require dram wishbones signals to be wired by toplevel
top-nexys-video.vhdl soc: Rename wb_dram_ctrl to wb_ext_io and rework decoding