gowin: add preliminary support for GW5AST-138

Arora V series is a new series of Gowin FPGA, in which the flashing
process has changed.

Add preliminary support by adding FS file line count and deal with the
SRAM writing process. Flash writing is not yet done.

Signed-off-by: Icenowy Zheng <[email protected]>

src/fsparser.cpp

@@ -180,6 +180,13 @@ int FsParser::parse()
 		case 0x0000281b: /* GW2A-55    */
 			nb_line = 2038;
 			break;
+		case 0x0001081b: /* GW5AST-138 */
+			/*
+			 * FIXME: Lack of information,
+			 * so just accept everything.
+			 */
+			nb_line = 65535;
+			break;
 		default:
 			printWarn("Warning: Unknown IDCODE");
 			nb_line = 0;