+SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2001
* Dave Ellis, SIXNET, dge@sixnetio.com
*
- * SPDX-License-Identifier: GPL-2.0+
*/
Using autoboot configuration options
"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
These options give more control over stopping autoboot. When
they are used a specific character or string is required to
character of a key string does not appear in the rest of the
string.
- 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
+ CONFIG_AUTOBOOT_ENCRYPTION
- If this option is defined, you can stop the autoboot process
- by hitting a key even in that case when "bootdelay" has been
- set to 0. You can set "bootdelay" to a negative value to
- prevent the check for console input.
+ "bootstopkeysha256" environment variable
+
+ - Hash value of the input which unlocks the device and
+ stops autoboot.
+
+ This option allows a string to be entered into U-Boot to stop the
+ autoboot. The string itself is hashed and compared against the hash
+ in the environment variable 'bootstopkeysha256'. If it matches then
+ boot stops and a command-line prompt is presented.
+
+ This provides a way to ship a secure production device which can also
+ be accessed at the U-Boot command line.
CONFIG_RESET_TO_RETRY
(Only effective when CONFIG_BOOT_RETRY_TIME is also set)
After the countdown timed out, the board will be reset to restart
again.
+
+ CONFIG_AUTOBOOT_USE_MENUKEY
+ CONFIG_AUTOBOOT_MENUKEY
+
+ If this key is pressed to stop autoboot, then the commands in the
+ environment variable 'menucmd' will be executed before boot starts.
+ For example, 33 means "!" in ASCII, so pressing ! at boot would take
+ this action.