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I`d like to get contents of root filesystem on sl500.
it is using cramfs as i understood, and when i looked into
firmware binary file it looks like it has inside cramfs image,
but i don`t know how to get it.
Is there a way to add some custom software to asus sl500? i`d like
to add some progs, re-create firmware and load it into system.
Please use search on 'cramfs'. This gives you lots of interesting topics about hacking around in the firmware.
There are cramfs tools. Unfortunately cramfsck.c doesn't allow to extract CRAMFS with different endianess, but I wrote a fix and SL ROM was extracted. I can share patched source and compiled cygwin version.
currently i found that cramfs in firmware has big endianess and that linux kernel on pc only understands cramfs with litle endian. also i found some patches for 2.4 to enable work with big endian cramfs:Quote:
There are cramfs tools. Unfortunately cramfsck.c doesn't allow to extract CRAMFS with different endianess, but I wrote a fix and SL ROM was extracted. I can share patched source and compiled cygwin version.
http://www.ussg.iu.edu/hypermail/lin...02.3/0365.html
Also, i found this util in debian: http://packages.debian.org/unstable/utils/cramfsswap
I tried it , and on 1st time it failed here:
/* I'm not sure about the changes between v1 and v2. So for now
don't support v1. */
if ( (flags & 0x1) == 0 )
{
fprintf(stderr,"Error: Not cramfs version 2!\n");
exit(1);
}
I commented this part and tried... it converted some part of file and segfaulted, but i was able to mount image and see files:
bin dev firewall.cfg home lib mnt proc root tmp var
cpu1 etc flash0 jffs2 log opt ramfs sbin usr vmlinux
If you have/know other tools to convert cramfs image to litle endian, please post.
http://www.palmoid.com/cramfsck.c was modified to compile under cygwin with gcc -I. cramfsck.c -lz . Headers cramfs_fs.h, cramfs_fs_sb.h, fs.h were put under linux subdir. There were two dirty hacks into code:
- reading big endian fs on little endian processor
- changing symlinks and special devices to plain files with .l and .s prefixes.
http://www.palmoid.com/cramfsck.exe require cygwin dlls to run