Warning: Building ROM FS is for experienced users only. Improper operation will make your system unusable.
ROM disk file system is the image of ‘romdisk’ directory. Normally, user programs should be placed in /flash/bin directory which has much larger free space and is easier to update. There’s no need for users to rebuild the ROM file system.
We don't recommend users to do it. However, for some reasons, if one really wants to build his own ROM FS, here it is:
Manage Files in "romdisk"
Directories in romdisk
|
bin/ dev/ etc/ flash/ proc/ sd/ swap/ tmp/ usb/ usr/ var/ |
Root file system of the target device. File structure in this directory will be converted into a single image 'romfs.zip' which can be stored in flash ROM. The space limit of this ROM disk is 1 MB (before compression). |
Convert "romdisk" to romfs.zip
Change working directory to
"image".
Build it by “make”
The building process generate "romfs.img", and further compress it into "romfs.zip".
|
[john@linux
image]$ make genromfs
-d ../romdisk -f romfs.img zip
romfs.zip romfs.img updating:
romfs.img (deflated 45%) ls
-l romfs.* -rw-r--r-- 1 john users 816128 Mar 27
04:28 romfs.img -rw-r--r-- 1 john users 446324 Mar 27
04:28 romfs.zip rm
romfs.img [john@linux
image]$ |
Contents of directory "image"
|
linux.zip |
Linux system compressed binary |
|
romfs.zip |
ROM file system compressed binary |
|
rom.bin |
saved ROM image |
|
bootloader.bin |
boot loader |
|
Makefile |
script for generating ROM |
Update ROM FS with eUpg90 Utility
Use “eUpg90 –romfs” command to download “romfs.zip” to the device. See eUpg90 section.