Hacking T-RBYDEUC Firmware - LE40A756 and A856

[erdem_ua]

User yawniek requested support for it's firmware and made some light investigation to file.

I just download older samsung firmware, T-RBYDEUC 1013.1
This firmware has no exe.img.enc file on index folder. Because exe.img is in place and not encrypted with xor.

I mount this image via

Code: Select all

 #mount exe.img x/ -o loop

and investigated firmware.
instead of "rc.local" file it uses "start.sh" for init works.
start.sh has some interesting lines starting from line 16

Code: Select all

## cat /proc/version > /dev/null
## ifconfig lo 127.0.0.1
## # start telnetd
## /usr/sbin/inetd > /dev/null

I think it's needed to remove all '#' from here. Will enable telnet daemon.

On the next line

Code: Select all

## mount -n -t usbfs none /proc/bus/usb

Mounting usbfs is also disabled here and because its enabled on load.sh script.

yawniek uses this firmware an I think need make some test on this firmware.

Firmware has rootfs.img too and using squashfs system.

I found that fw has only rt73.ko ( there is absence of rt2870sta.ko )
The kernel compiled with older kernel, 2.6.17 depending on module string.
So I think we could extend wireless dongle support on this firmware too.

Code: Select all

modinfo rt73.ko 
filename:       rt73.ko
author:         Paul Lin <paul_lin@ralinktech.com>
description:    RT73 Wireless Lan Linux Driver
vermagic:       2.6.17.14_stm22_0039-Samsung_7103 preempt mod_unload SH4LE gcc-4.1
depends:        usbcore
alias:          usb:v04E8p2008d*dc*dsc*dp*ic*isc*ip*
alias:          usb:v07B8pB21Dd*dc*dsc*dp*ic*isc*ip*
parm:           hostname:Host Name (charp)

Thats all for now. Any one using this firmware to make test/improvements?
Erdem

[arris69]

hi,
last week user nobody0472 contacted me for support in T-RBYDEUC Firmware
send him nearly same instruction as you wrote here.
i don't know he found time to check the changes, got no success or fail report.
for modules:
# file /home/Software/Tuxbox/Samsung-Firmware/Firmware/T-RBYDEU/dimage/exe/modules/rt73.ko
/home/Software/Tuxbox/Samsung-Firmware/Firmware/T-RBYDEU/dimage/exe/modules/rt73.ko: ELF 32-bit LSB relocatable, Renesas SH, version 1 (SYSV), not stripped

other cpu (sh)

needs new toolchain

@newage_hun
you have mail on the address you sent me, pls look in junk mail folder too,
my provider is some times on blacklists!

arris

[arris69]

Hi,

I have just discovered that project and I think that I am going to try it on my TV...

I would like to be sure that I am going to follow the good way of doing it. I have already downloaded T-AMBDFR.exe.

My commands :
....

hi,

in theorie your commands are ok, you can check with

Code: Select all

file exe.img

the version of your new image.
newer version of mksquashfs may produce version 3.1 file.

but i think no one here tested until now to upload a self generated squashfs img.

arris69

[erdem_ua]

Hi trois-six

It's bad to post your A696 information to here.
Here is T-RBYDEUC Firmware - LE40A756 and A856 topic.
your Topic needed to have T-AMBDFR Firmware - LE40A696 name.
Could you open a new thread and copy your posts to there? If I make, posts looks like belong mine.
I can clean here after.

Do you have any success with kernel compilation toolchain?
I wish 2.6.18 WiFi drivers are compatible with 2.6.17.

Regards

[erdem_ua]

I inspected T-RBYDEUC Firmware and understand that it's different program. Not compatible with LExxB65x exeDSP.
So I can't apply VideoAR Fix v1 to this firmware.
It needs hacked from zero with LE40A756 TV, debug enabled...
Instead touching exeDSP, I can add Telnet enable patch. But I don't know if this TV's has a Ethernet port or not.
If TV has USB port, I think we could add WiFi modules and with mounting NFS/Samba device, can use DLNA like features to this series