View source for Samsung A Series (sh4 CPU) Hacks

==T-AMBDFRC (Models LExxA676)==

A SH4 CPU model - please add details.


==T-RBYDEUC (Models LExxA756, LExxA856, LExxA956/959)==

==='''Available hacks / software'''===

Look for latest versions in [http://download.samygo.tv/A%20Series/ download area]


[[SamyGO Firmware Patcher]]
* WiseLink video player aspect ratio fix (arfix-sh) is applied
* optionally enabling boot time call to a script /SamyGO/rcSGO from USB disk (answer upercase '''U''') - e.g. for Extension Pack


[[SamyGO Extensions Pack]]

A collection of command line linux applications. Unpack files to USB disk and insert to tv set.
A firmware patch or [http://wiki.samygo.tv/index.php?title=Enable_Serial_Console_on_non_CI%2B_Devices serial console] is necessary to start extensions (call a script /SamyGO/rcSGO on USB disk)
* SSH daemon for linux command line access ( user: root, password: SamyGO )
* kernel modules/scripts for mounting CIFS (Windows) shares and NFS shares
* lot lot more... see [http://forum.samygo.tv/viewtopic.php?f=8&t=1313 discussion]


[[Video player aspect ratio fix (SH4)]]

arfix-sh fixes part of internal firmware, WiseLink video player.
Also see [http://forum.samygo.tv/viewtopic.php?f=5&t=384 discussion]


==='''T-RBYDEUC technical info'''===

The main CPU of these models is NOT an ARM processor but the '''SH4 processor''' [http://www.st.com/stonline/products/literature/bd/11660/sti7109.pdf STi7109]. Therefore ARM-based hacks and tools won't run!


[[Getting access to u-boot (SH4)]]


Official firmware from Samsung: T-RBYDEU (T-RBYDEUC) in version 1013.1

Linux version:
   Linux version 2.6.17.14_stm22_0039-Samsung_7103 (gcc version 4.1.1 (STMicroelectronics/Linux Base 4.1.1-23)) #363 PREEMPT Sun Jul 27 17:14:14 KST 2008

Other differences from ARM model line:
* exeDSP has all symbols stripped
* libGame.so loading and running is completely blocked in exeDSP
* First USB is connected to MTK8226 (secondary CPU) so the first USB disk appears as /dev/sdb (mountpoint /dtv/usb/sdb1)
* busybox has a malfunctioning telnet-deamon compiled in (busybox is compiled without /dev/pts filesystem support however kernel needs it)



==Manual firmware patching T-RBYDEUC==

'''<span style="color:red">Obsoleted by SamyGO Firmware Patcher and Extension Pack.</span>'''

So, what you need is an updated BusyBox, a modified exe.img to enable script-starts from USB-Pens and a good USB-Script to start telnet-daemon.
You can find most of the things in the following thread:

Hacking T-RBYDEUC Firmware - LE40A756 and A856 
[http://forum.samygo.tv/viewtopic.php?f=2&t=49]

So, what you need to do, to get access to your TV:

1. Modifiy your start.sh in exe.img, either by unpacking and repacking it (see below how to do), or by using a hex-editor.
There are many descriptions how to modify exe.img and to correct the crc-hash. What you need to add to start.sh:

   export LOGNAME="root" [already there]
   ...
   cd /dtv/usb
   PATH_USB=`cat log | grep Mount`
   PATH_USB=`echo ${PATH_USB##MountDir : }`
   echo $PATH_USB
   $PATH_USB/usb.sh &
   ## mount -n -t usbfs none /proc/bus/usb
   ...

<span style="color:red">Modification may not work as some USB disks get mounted later than the modified code is executed</span>

and now I can run scripts (usb.sh) from pendrive. Therefore you need to build (or copy from archive) the folloing script to the root of your pendrive:

   #! /bin/sh
   
   echo "!!!!!!!!!!!!!! USB START !!!!!!!!!!!!!!"
   /bin/stty -F /dev/ttyAS0 ospeed 57600 ispeed 57600
   #line before enables console for speed 57600. Put 'debug' to console and you see menu, put '12' and ENTER
   echo "!!!!!!!!!!!!!! start console on 57600 !!!!!!!!!!!!!!"
   
   #sleep 25 (m)sec is need for wait ethernet start
   sleep 25
   
   cd /dtv/usb
   PU=`cat log | grep Mount`
   PU=`echo ${PU##MountDir : }`
   
   echo "!!!!!!!!!!!!!! start telnet !!!!!!!!!!!!!!"
   $PU/busybox telnetd -l /bin/sh
   
   echo "!!!!!!!!!!!!!! start cifs.ko !!!!!!!!!!!!!!"
   cd $PU
   insmod cifs.ko
   
   sleep 4
   
   echo "!!!!!!!!!!!!!! clear old contents USB on TV  !!!!!!!!!!!!!!"
   rm /mtd_contents/V* -R
   rm /mtd_contents/database -R
   
   echo "!!!!!!!!!!!!!! start mount !!!!!!!!!!!!!!"
   mount -t cifs //XXX.XXX.XXX.XXX/photo $PU/photo -o user=user_xp -o pass=password_xp
   mount -t cifs //XXX.XXX.XXX.XXX/mp3 $PU/mp3 -o user=user_xp -o pass=password_xp
   mount -t cifs //XXX.XXX.XXX.XXX/video $PU/video -o user=user_xp -o pass=password_xp
   
   mount
   echo "!!!!!!!!!!!!!! USB END !!!!!!!!!!!!!!"

On pendrive you have to have empty folders: photo, mp3, video and files: usb.sh, cifs.ko (size for my compilation 2707316 bytes), busybox (size for my compilation 992084 bytes)

You can download the whole package here: 
[http://forum.samygo.tv/download/file.php?id=62]