2020-03-02 20:16:04 +08:00
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README
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======
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Overview
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--------
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This directory contains logic to support a custom ROMFS start-up script.
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This startup script is used by by the NSH when it starts provided that
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CONFIG_NSH_ARCHROMFS=y. The script provides a ROMFS volume that will be
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mounted at /etc and will look like this at run-time:
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NuttShell (NSH) NuttX-8.2
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nsh> ls -l /etc
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/etc:
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dr-xr-xr-x 0 .
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-r--r--r-- 20 group
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dr-xr-xr-x 0 init.d/
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-r--r--r-- 35 passwd
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/etc/init.d:
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dr-xr-xr-x 0 ..
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-r--r--r-- 110 rcS
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nsh>
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/etc/init.d/rcS is the start-up script; /etc/passwd is a the password
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file. It supports a single user:
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USERNAME: admin
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PASSWORD: Adminstrator
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nsh> cat /etc/passwd
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admin:8Tv+Hbmr3pLddSjtzL0kwC:0:0:/
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The encrypted passwords in the provided passwd file are only valid if the
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TEA key is set to: 012345678 9abcdef0 012345678 9abcdef0. Changes to either
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the key or the password word will require regeneration of the nsh_romfimg.h
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header file.
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The format of the password file is:
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user:x:uid:gid:home
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Where:
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user: User name
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x: Encrypted password
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uid: User ID (0 for now)
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gid: Group ID (0 for now)
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home: Login directory (/ for now)
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/etc/group is a group file. It is not currently used.
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nsh> cat /etc/group
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root:*:0:root,admin
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The format of the group file is:
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group:x:gid:users
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Where:
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group: The group name
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x: Group password
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gid: Group ID
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users: A comma separated list of members of the group
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2020-11-28 12:03:51 +08:00
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/etc/init.d/rcS should have the following contents :
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2020-03-02 20:16:04 +08:00
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vi rcS
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echo "This is NuttX"
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Updating the ROMFS File System
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------------------------------
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The content on the nsh_romfsimg.h header file is generated from a sample
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directory structure. That directory structure is contained in the etc/ directory and can be modified per the following steps:
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1. Change directory to etc/:
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cd etc/
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2. Make modifications as desired.
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3. Create the new ROMFS image.
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genromfs -f romfs_img -d etc -V SimEtcVol
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4. Convert the ROMFS image to a C header file
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xxd -i romfs_img >nsh_romfsimg.h
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5. Edit nsh_romfsimg.h, mark both data definitions as 'const' so that
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that will be stored in FLASH.
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