add prog directory with some Xilinx OpenOCD configurations files.

litex_boards/prog/openocd_netv2_rpi.cfg

@@ -0,0 +1,15 @@
+interface bcm2835gpio
+transport select jtag
+bcm2835gpio_peripheral_base 0x3F000000
+bcm2835gpio_speed_coeffs 100000 5
+bcm2835gpio_jtag_nums 4 17 27 22
+bcm2835gpio_srst_num 24
+reset_config none
+
+source [find cpld/xilinx-xc7.cfg]
+adapter_khz 10000
+
+proc fpga_program {} {
+    global _CHIPNAME
+    xc7_program $_CHIPNAME.tap
+}

litex_boards/prog/openocd_xilinx_xc6.cfg

@@ -0,0 +1,14 @@
+interface ftdi
+ftdi_vid_pid 0x0403 0x6010
+ftdi_channel 0
+ftdi_layout_init 0x00e8 0x60eb
+reset_config none
+
+source [find cpld/xilinx-xc6.cfg]
+source [find cpld/jtagspi.cfg]
+adapter_khz 25000
+
+proc fpga_program {} {
+    global _CHIPNAME
+    xc6_program $_CHIPNAME.tap
+}

litex_boards/prog/openocd_xilinx_xc7.cfg

@@ -0,0 +1,14 @@
+interface ftdi
+ftdi_vid_pid 0x0403 0x6010
+ftdi_channel 0
+ftdi_layout_init 0x00e8 0x60eb
+reset_config none
+
+source [find cpld/xilinx-xc7.cfg]
+source [find cpld/jtagspi.cfg]
+adapter_khz 25000
+
+proc fpga_program {} {
+    global _CHIPNAME
+    xc7_program $_CHIPNAME.tap
+}