Clipsal C-Bus Guia do Utilizador descarregar pdf (Página 23)

cbus Documentation, Release 0.1-dev

– cftp_daemon will not be able to copy a new project ﬁle into RAM temporarily for ﬂashing, and may be perma-

nently stuck in this state. This partial brick state could probably gotten around by writing NULL over the contents of

/dev/mtdblock/6, then transferring a new project ﬁle.

4.5 Firmware image

Firmware image for the device is bundled with the PICED software as Firmware/firmware_1_24_0.img. The

tool binwalk shows the layout of the ﬁrmware image:

0x13 uImage header, header size: 64 bytes, header CRC: 0x2781C02C,

created: Mon Oct 3 11:26:33 2011, image size: 722439 bytes,

Data Address: 0x40008000, Entry Point: 0x40008000,

data CRC: 0xF7547123, OS: Linux, CPU: ARM,

image type: OS Kernel Image, compression type: lzma,

image name: Linux-2.6.17

0x53 LZMA compressed data, properties: 0x5D,

dictionary size: 8388608 bytes, uncompressed size: 2015280 bytes

0xC0013 Squashfs filesystem, little endian, version 2.1,

size: 1736392 bytes, 435 inodes, blocksize: 65536 bytes,

created: Mon Oct 3 11:27:23 2011

Appears to be a uBoot image with some extra headers on the image.

4.5.1 Extracting root ﬁlesystem

The version of squashfs used by the root ﬁlesystem is very old, and current Linux kernels are incapable of mounting

it. It requires an LZMA version of squashfs-2.1 in order to extract it, available from ﬁrmware-mod-kit. Their SVN

repository contains all the components needed:

$ svn co https://firmware-mod-kit.googlecode.com/svn/trunk/src/lzma/

$ svn co https://firmware-mod-kit.googlecode.com/svn/trunk/src/squashfs-2.1-r2/

$ cd squashfs-2.1-r2

$ make

Once built, extract the root ﬁlesystem with:

$ binwalk -D squashfs:squashfs firmware_1_24_0.img

$ ./squashfs-2.1-r2/unsquashfs-lzma C0013.squashfs

This will then give an extracted copy of the root ﬁlesystem in the directory squashfs-root.

4.5.2 Filesystem observations

These are things that need some more investigation:

• NTP client which has 32 hard-coded NTP server IP addresses.

4.5. Firmware image 19

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