[PATCH v2 1/1] cmd: add serial console support for the cls command

Heinrich Schuchardt heinrich.schuchardt at canonical.com
Fri Feb 11 18:11:05 CET 2022

Currently the cls command does not support the serial console

The screen can be cleared in the video uclass, the colored frame buffer
console, and the serial console by sending the same escape sequence.
This reduces the cls command to a single printf() statement on most

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
	support cls with CONFIG_DM_VIDEO=y and CONFIG_VIDEO_ANSI=n
 cmd/cls.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/cmd/cls.c b/cmd/cls.c
index eab4e6993b..b411fc1eb1 100644
--- a/cmd/cls.c
+++ b/cmd/cls.c
@@ -11,12 +11,16 @@
 #include <lcd.h>
 #include <video.h>
+#define CSI "\x1b["
 static int do_video_clear(struct cmd_tbl *cmdtp, int flag, int argc,
 			  char *const argv[])
-#if defined(CONFIG_DM_VIDEO)
-	struct udevice *dev;
+	__maybe_unused struct udevice *dev;
+	/*  Send clear screen and home */
+	printf(CSI "2J" CSI "1;1H");
+#if defined(CONFIG_DM_VIDEO) && !defined(CONFIG_VIDEO_ANSI)
 	if (uclass_first_device_err(UCLASS_VIDEO, &dev))
 		return CMD_RET_FAILURE;

More information about the U-Boot mailing list