X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=doc%2FREADME.autoboot;h=14e3660dd8d7634e058d280bed1e457de8838066;hb=3df7eebbc4fbdf6e09d8abf1cf003249d435dca9;hp=e4c41867351a2233bc623c753adc00eaf3919dd1;hpb=8b74bf31fe57edfc502f94e905977304eac943ca;p=karo-tx-uboot.git

diff --git a/doc/README.autoboot b/doc/README.autoboot
index e4c4186735..14e3660dd8 100644
--- a/doc/README.autoboot
+++ b/doc/README.autoboot
@@ -2,23 +2,7 @@
  * (C) Copyright 2001
  * Dave Ellis, SIXNET, dge@sixnetio.com
  *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier:	GPL-2.0+
  */
 
 Using autoboot configuration options
@@ -90,6 +74,7 @@ What they do
 	"bootretry" is >= 0.
 
   CONFIG_AUTOBOOT_KEYED
+  CONFIG_AUTOBOOT_KEYED_CTRLC
   CONFIG_AUTOBOOT_PROMPT
   CONFIG_AUTOBOOT_DELAY_STR
   CONFIG_AUTOBOOT_STOP_STR
@@ -114,10 +99,17 @@ What they do
 	CONFIG_AUTOBOOT_PROMPT is displayed before the boot delay
 	selected by CONFIG_BOOTDELAY starts. If it is not defined
 	there is no output indicating that autoboot is in progress.
-	If "%d" is included, it is replaced by the number of seconds
-	remaining before autoboot will start, but it does not count
-	down the seconds. "autoboot in %d seconds\n" is a reasonable
-	prompt.
+
+	Note that CONFIG_AUTOBOOT_PROMPT is used as the (only)
+	argument to a printf() call, so it may contain '%' format
+	specifications, provided that it also includes, sepearated by
+	commas exactly like in a printf statement, the required
+	arguments. It is the responsibility of the user to select only
+	such arguments that are valid in the given context. A
+	reasonable prompt could be defined as
+
+		#define CONFIG_AUTOBOOT_PROMPT \
+			"autoboot in %d seconds\n",bootdelay
 
 	If CONFIG_AUTOBOOT_DELAY_STR or "bootdelaykey" is specified
 	and this string is received from console input before
@@ -144,6 +136,13 @@ What they do
 	environment variable you can specify a second, alternate
 	string (which allows you to have two "password" strings).
 
+	The CONFIG_AUTOBOOT_KEYED_CTRLC #define allows for the boot
+	sequence to be interrupted by ctrl-c, in addition to the
+	"bootdelaykey" and "bootstopkey". Setting this variable
+	provides an escape sequence from the limited "password"
+	strings.
+
+
   CONFIG_ZERO_BOOTDELAY_CHECK
 
 	If this option is defined, you can stop the autoboot process