1 files changed, 76 insertions, 0 deletions
diff --git a/cmd/terminal.c b/cmd/terminal.c
new file mode 100644
index 0000000000..4b9c0b34de
--- /dev/null
+++ b/cmd/terminal.c
@@ -0,0 +1,76 @@
+/*
+ * (C) Copyright 2007 OpenMoko, Inc.
+ * Written by Harald Welte <laforge@openmoko.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/*
+ * Boot support
+ */
+#include <common.h>
+#include <command.h>
+#include <stdio_dev.h>
+#include <serial.h>
+
+int do_terminal(cmd_tbl_t * cmd, int flag, int argc, char * const argv[])
+{
+	int last_tilde = 0;
+	struct stdio_dev *dev = NULL;
+
+	if (argc < 1)
+		return -1;
+
+	/* Scan for selected output/input device */
+	dev = stdio_get_by_name(argv[1]);
+	if (!dev)
+		return -1;
+
+	serial_reinit_all();
+	printf("Entering terminal mode for port %s\n", dev->name);
+	puts("Use '~.' to leave the terminal and get back to u-boot\n");
+
+	while (1) {
+		int c;
+
+		/* read from console and display on serial port */
+		if (stdio_devices[0]->tstc()) {
+			c = stdio_devices[0]->getc();
+			if (last_tilde == 1) {
+				if (c == '.') {
+					putc(c);
+					putc('\n');
+					break;
+				} else {
+					last_tilde = 0;
+					/* write the delayed tilde */
+					dev->putc('~');
+					/* fall-through to print current
+					 * character */
+				}
+			}
+			if (c == '~') {
+				last_tilde = 1;
+				puts("[u-boot]");
+				putc(c);
+			}
+			dev->putc(c);
+		}
+
+		/* read from serial port and display on console */
+		if (dev->tstc()) {
+			c = dev->getc();
+			putc(c);
+		}
+	}
+	return 0;
+}
+
+
+/***************************************************/
+
+U_BOOT_CMD(
+	terminal,	3,	1,	do_terminal,
+	"start terminal emulator",
+	""
+);