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university:tools:m2k:common:customizing [20 Jan 2020 14:09] – created Cristina Suteuuniversity:tools:m2k:common:customizing [22 Jun 2020 11:07] (current) – new commands Michael Hennerich
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 Setting this to ''1'' will calibrate the board. Setting this to ''1'' will calibrate the board.
 +
 +===== Changing the root password on the target =====
 +
 +In M2k firmware version v0.26 and later there are two new command/scripts,
 +facilitating persistent SSH key and password changes.
 +
 +
 +Use the ''device_passwd'' command to permanently change the password.
 +This script/command calls the Linux passwd command and stores all user/password related files on mtd2 (JFFS2).
 +The next time the system boots it will check all the MD5 sums and then uses this password instead.
 +
 +<WRAP box bggreen><wrap info>This specifies any shell prompt running on the target. The ''#'' is the prompt, and the **''bold''** is what you type</wrap>
 +<xterm>
 +# **device_passwd** 
 +Changing password for root
 +New password: 
 +Bad password: too short
 +Retype password: 
 +passwd: password for root changed by root
 +#
 +</xterm>
 +</WRAP>
 +
 +**Note:** In case you forgot your password, there a mechanism which allows you to revert to the default password using the config.txt file on the mass storage device.
 +Add ''revert_passwd = 1'' under the ''[ACTIONS]'' sections, then follow the procedure described here: [[.:customizing#config_file_actions | Config File ACTIONS]]
 +
 +===== Enabling persistent SSH keys =====
 +
 +In M2k firmware version v0.26 and later there are two new command/scripts,
 +facilitating persistent SSH key and password changes.
 +
 +Use the ''device_persistent_keys'' command to permanently store your private SSH dropbear keys.
 +This script/command copies the current key or generates one, which is now stored on mtd2 (JFFS2).
 +The next time the system boots it will check the MD5 sum and then uses this key instead.
 +
 +<WRAP box bggreen><wrap info>This specifies any shell prompt running on the target. The ''#'' is the prompt, and the **''bold''** is what you type</wrap>
 +<xterm>
 +# **device_persistent_keys** 
 +Generating 256 bit ecdsa key, this may take a while...
 +Public key portion is:
 +ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBH+cMtkirbmWjOq+EjW0Lzir5LVuWXFwRTOMOnb0eWo
 +Fingerprint: sha1!! 10:9c:40:18:f8:e3:10:f1:c8:62:ba:8d:27:48:1b:35:16:8d:a5:f5
 +#
 +</xterm>
 +</WRAP>
university/tools/m2k/common/customizing.txt · Last modified: 22 Jun 2020 11:07 by Michael Hennerich

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