add gd32vw55x configuration file

tcl/target/gd32vw55x.cfg

@@ -0,0 +1,36 @@
+#
+# GigaDevice GD32VW55x target
+#
+# https://www.gigadevice.com/products/microcontrollers/gd32/risc-v/
+#
+set _CHIPNAME riscv
+jtag newtap $_CHIPNAME cpu -irlen 5 -expected-id 0x10307a6d
+
+set _TARGETNAME $_CHIPNAME.cpu
+target create $_TARGETNAME riscv -chain-position $_TARGETNAME
+$_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size 20480 -work-area-backup 0
+
+
+# Work-area is a space in RAM used for flash programming
+if { [info exists WORKAREASIZE] } {
+   set _WORKAREASIZE $WORKAREASIZE
+} else {
+   set _WORKAREASIZE 0x5000
+}
+
+# Allow overriding the Flash bank size
+if { [info exists FLASH_SIZE] } {
+    set _FLASH_SIZE $FLASH_SIZE
+} else {
+    # autodetect size
+    set _FLASH_SIZE 0
+}
+
+# flash size will be probed
+set _FLASHNAME $_CHIPNAME.flash
+
+flash bank $_FLASHNAME gd32vw55x 0x08000000 0x400000 0 0 $_TARGETNAME
+riscv set_reset_timeout_sec 1
+init
+
+halt