Unyaffs is a program to extract files from a YAFFS2 file system image. Currently it can only extract images created by mkyaffs2image.
Download the source from here.
Compiling:
Extract the contents into a suitable place and run the following command
make
Usage:
unyaffs [options] <image_file_name> [<extract_directory>]
Options:
-d detection of flash layout, no extraction
-b spare contains bad block information
-c <chunk size> set chunk size in KByte (default: autodetect, max: 16)
-s <spare size> set spare size in Byte (default: autodetect, max: 512)
-t list image contents
-v verbose output
-V print version
Source: Official github repository
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