Merge tdk_new and Ti375 Efinity support

Keep the current GPS software and Genesys2/VCU118 flows while integrating Ti375C529 Efinity, flash, programming, and debug support. Add board-specific SPI NOR profiles and persistent GPS flash layouts across all three boards.

Makefile

@@ -10,8 +10,8 @@ FPGA_BOARD ?= vcu118
 endif
 FPGA_TARGET_DIR := targets/fpga/$(FPGA_BOARD)
 
-.PHONY: help doctor soc-hw fpga-rtl fpga-bitstream fpga-elf-flash-image fpga-mcs fpga-flash-app fpga-flash fpga-flash-bitstream fpga-flash-mcs fpga-flash-all fpga-program fpga-debug-openocd fpga-debug-load fpga-uart fpga-config asic-rtl asic-sim clean
-.PHONY: fpga_rtl fpga_bitstream fpga_elf_flash_image fpga_mcs fpga_flash_app fpga_flash fpga_flash_bitstream fpga_flash_mcs fpga_flash_all fpga_program fpga_debug_openocd fpga_debug_load fpga_uart fpga_config
+.PHONY: help doctor soc-hw fpga-rtl fpga-bitstream fpga-elf-flash-image fpga-mcs fpga-flash-app fpga-flash fpga-flash-bitstream fpga-flash-mcs fpga-flash-all fpga-program fpga-detect fpga-debug-openocd fpga-debug-load fpga-uart fpga-config asic-rtl asic-sim clean
+.PHONY: fpga_rtl fpga_bitstream fpga_elf_flash_image fpga_mcs fpga_flash_app fpga_flash fpga_flash_bitstream fpga_flash_mcs fpga_flash_all fpga_program fpga_detect fpga_debug_openocd fpga_debug_load fpga_uart fpga_config
 
 help:
 	@printf '%s\n' \
@@ -19,11 +19,12 @@ help:
 	  '  make doctor          # check local JDK/Mill/CIRCT and RISC-V tools' \
 	  '  make soc-hw          # emit shared SoC FIRRTL through FPGA config' \
 	  '  make fpga-rtl        # emit selected FPGA SystemVerilog and wrapper' \
-	  '  make fpga-bitstream  # run selected FPGA Vivado bitstream flow' \
+	  '  make fpga-bitstream  # run selected board vendor bitstream flow' \
 	  '  make fpga-elf-flash-image' \
 	  '                       # build APP ELF and board flash-format app image' \
 	  '  make fpga-mcs        # generate combined bitstream + app MCS/BIN' \
 	  '  make fpga-program    # program selected FPGA SRAM' \
+	  '  make fpga-detect     # run selected board USB/JTAG detection target' \
 	  '  make fpga-flash-app  # build flash-format app image and program app flash region' \
 	  '  make fpga-flash      # alias for fpga-flash-app' \
 	  '  make fpga-flash-bitstream' \
@@ -39,7 +40,7 @@ help:
 	  '  make asic-sim        # run ASIC-style Questa sanity simulation' \
 	  '' \
 	  'Config:' \
-	  '  FPGA_BOARD=$(FPGA_BOARD)  # vcu118 or genesys2' \
+	  '  FPGA_BOARD=$(FPGA_BOARD)  # vcu118, genesys2, or ti375c529' \
 	  '  UART_BAUD=460800          # FPGA firmware and host listener default' \
 	  '  GPS_ESKF_ENABLE=1         # gps_system: 1 ESKF, 0 GPS-only' \
 	  '  IMU_SENSOR=auto           # gps_system: auto, tdk, st or stm' \
@@ -49,6 +50,7 @@ help:
 	  '  make -C hardware/soc help' \
 	  '  make -C targets/fpga/vcu118 help' \
 	  '  make -C targets/fpga/genesys2 help' \
+	  '  make -C targets/fpga/ti375c529 help' \
 	  '  make -C targets/asic/rocket help'
 
 doctor:
@@ -72,6 +74,9 @@ fpga-mcs:
 fpga-program:
 	$(MAKE) -C $(FPGA_TARGET_DIR) program-fpga
 
+fpga-detect:
+	$(MAKE) -C $(FPGA_TARGET_DIR) detect
+
 fpga-flash-app fpga-flash:
 	$(MAKE) -C $(FPGA_TARGET_DIR) program-flash
 
@@ -106,6 +111,7 @@ fpga_flash_bitstream: fpga-flash-bitstream
 fpga_flash_mcs: fpga-flash-mcs
 fpga_flash_all: fpga-flash-all
 fpga_program: fpga-program
+fpga_detect: fpga-detect
 fpga_debug_openocd: fpga-debug-openocd
 fpga_debug_load: fpga-debug-load
 fpga_uart: fpga-uart