On Sat, 7 Jun 2003 21:53:14 -0600, Erik Andersen wrote:
> I went through a similar exercise several weeks ago when I saw
> the thread on the l-k mailing list. It took just a fix minutes
> to extract the linux kernel and cramfs filesystem from their
> firmware. Linksys is indeed shipping BusyBox and the Linux
BTW, this is what I did to open up the Linksys rom...
#!/bin/sh
wget ftp://ftp.linksys.com/pub/network/WRT54G_1.02.1_US_code.bin
# I noticed a GZIP signature for a file name "piggy" at offset
# 60 bytes from the start, suggesting we have a compressed Linux
# kernel
dd if=WRT54G_1.02.1_US_code.bin bs=60 skip=1 | zcat > kernel
# Noticed there was a cramfs magic signature (bytes 45 3D CD 28
followed shortly by "Compressed ROMFS") at offset 786464
dd if=WRT54G_1.02.1_US_code.bin of=cramfs.image bs=786464 skip=1
file cramfs.image
sudo mount -o loop,ro -t cramfs ./cramfs.image /mnt
ls -la /mnt/bin
file /mnt/bin/busybox
strings /mnt/bin/busybox | grep BusyBox
# Use uClibc's ldd to get useful answers for non-x86 binaries
/usr/i386-linux-uclibc/bin/i386-uclibc-ldd /mnt/bin/busybox
-Erik
-- Erik B. Andersen http://codepoet-consulting.com/ --This message was written using 73% post-consumer electrons-- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Sun Jun 15 2003 - 22:00:19 EST