riscv32: Implemented probing for the GD32VF1

src/target/jep106.h

@@ -68,6 +68,11 @@
 #define JEP106_MANUFACTURER_RASPBERRY    0x913U /* Raspberry Pi */
 #define JEP106_MANUFACTURER_RENESAS      0x423U /* Renesas */
 #define JEP106_MANUFACTURER_XILINX       0x309U /* Xilinx */
+/*
+ * This JEP code should belong to "Andes Technology Corporation", but is used on RISC-V by GigaDevice,
+ * so in the unlikely event we need to support chips by them, here be dragons.
+ */
+#define JEP106_MANUFACTURER_RV_GIGADEVICE 0x61eU
 
 /*
  * This code is not listed in the JEP106 standard, but is used by some stm32f1 clones

src/target/riscv32.c

@@ -35,7 +35,9 @@
 #include "target.h"
 #include "target_internal.h"
 #include "target_probe.h"
+#include "jep106.h"
 #include "riscv_debug.h"
+#include "gdb_packet.h"
 
 typedef struct riscv32_regs {
 	uint32_t gprs[32];
@@ -91,6 +93,17 @@ bool riscv32_probe(target_s *const target)
 	target->breakwatch_set = riscv32_breakwatch_set;
 	target->breakwatch_clear = riscv32_breakwatch_clear;
 
+	switch (target->designer_code) {
+	case JEP106_MANUFACTURER_RV_GIGADEVICE:
+		PROBE(gd32vf1_probe);
+		break;
+	}
+
+#if PC_HOSTED == 0
+	gdb_outf("Please report unknown device with Designer 0x%x\n", target->designer_code);
+#else
+	DEBUG_WARN("Please report unknown device with Designer 0x%x\n", target->designer_code);
+#endif
 	return false;
 }