* (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
CONFIG_BOOT_RETRY_TIME
CONFIG_BOOT_RETRY_MIN
- bootretry environment variable
+ "bootretry" environment variable
These options determine what happens after autoboot is
stopped and U-Boot is waiting for commands.
CONFIG_BOOT_RETRY_TIME must be defined to enable the boot
- retry feature. If the environment variable 'bootretry' is
+ retry feature. If the environment variable "bootretry" is
found then its value is used, otherwise the retry timeout is
CONFIG_BOOT_RETRY_TIME. CONFIG_BOOT_RETRY_MIN is optional and
defaults to CONFIG_BOOT_RETRY_TIME. All times are in seconds.
If CONFIG_BOOT_RETRY_TIME < 0 the feature is there, but
doesn't do anything unless the environment variable
- 'bootretry' is >= 0.
+ "bootretry" is >= 0.
CONFIG_AUTOBOOT_KEYED
+ CONFIG_AUTOBOOT_KEYED_CTRLC
CONFIG_AUTOBOOT_PROMPT
CONFIG_AUTOBOOT_DELAY_STR
CONFIG_AUTOBOOT_STOP_STR
CONFIG_AUTOBOOT_DELAY_STR2
CONFIG_AUTOBOOT_STOP_STR2
- bootdelaykey environment variable
- bootstopkey environment variable
- bootdelaykey2 environment variable
- bootstopkey2 environment variable
+ "bootdelaykey" environment variable
+ "bootstopkey" environment variable
+ "bootdelaykey2" environment variable
+ "bootstopkey2" environment variable
These options give more control over stopping autoboot. When
they are used a specific character or string is required to
stop or delay autoboot.
Define CONFIG_AUTOBOOT_KEYED (no value required) to enable
- this group of options. CONFIG_AUTOBOOT_DELAY_STR,
+ this group of options. CONFIG_AUTOBOOT_DELAY_STR,
CONFIG_AUTOBOOT_STOP_STR or both should be specified (or
specified by the corresponding environment variable),
otherwise there is no way to stop autoboot.
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.
- If CONFIG_AUTOBOOT_DELAY_STR or bootdelaykey is specified and
- this string is received from console input before autoboot
- starts booting, U-Boot gives a command prompt. The U-Boot
- prompt will time out if CONFIG_BOOT_RETRY_TIME is used,
- otherwise it never times out.
+ 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
- If CONFIG_AUTOBOOT_STOP_STR or bootstopkey is specified and
+ #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
+ autoboot starts booting, U-Boot gives a command prompt. The
+ U-Boot prompt will time out if CONFIG_BOOT_RETRY_TIME is
+ used, otherwise it never times out.
+
+ If CONFIG_AUTOBOOT_STOP_STR or "bootstopkey" is specified and
this string is received from console input before autoboot
starts booting, U-Boot gives a command prompt. The U-Boot
prompt never times out, even if CONFIG_BOOT_RETRY_TIME is
character of a key string does not appear in the rest of the
string.
- Using the CONFIG_AUTOBOOT_DELAY_STR2 / bootdelaykey2 and/or
- CONFIG_AUTOBOOT_STOP_STR2 / bootstopkey #defines and/or
- environment variables you can specify a second, alternate
- string (which allows you to haw two "password" strings).
+ Using the CONFIG_AUTOBOOT_DELAY_STR2 #define or the
+ "bootdelaykey2" environment variable and/or the
+ CONFIG_AUTOBOOT_STOP_STR2 #define or the "bootstopkey"
+ 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
projects / karo-tx-uboot.git / blobdiff