TELE-audiovision - The World’s Largest Digital TV Trade Magazine - page 152

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TELE-audiovision International — The World‘s Largest Digital TV Trade Magazine
— 07-08/2013
TTL Recovery
1. To do the recovery, you need to enter
YAMON as described before and then
it is essential to configure and start the
network adapter of the AZBox.
2. Now we want to load the recovery image
called “vmlinux.bin” contained in the
recovery archives. Do not press enter, yet!
3. You need to copy the required files to a
folder, first.
4. Now it is time to start PumpKIN, the
freeware TFTP server.
5. Configure the path to the folder were
you placed the recovery files for your
AZBox.
6. Now you can press ENTER on the Putty
window and hopefully the “vmlinux.bin”
file will be loaded into the RAM of the
AZBox.
7. Type the “go” command inside the
Putty window to start the recovery Linux
from RAM. The usual start-up messages
appear…
8. …and only a short while later, you will
be prompted for the AZBOX login. Use
“root” for login and you may or may not
have to enter the password, which will be
“azbox”.
9. If everything went well, you are now
logged in.
10. Change to the “/tmp” folder with “cd /
tmp”.
11. And then confirm your network
configuration with the command
“ifconfig”. It is good to have the rooter
configured as a DHCP server, which
automatically provides the network
configuration.
12. Use your favourite FTP client (we like
the free FileZilla) and transfer the backup
kernel and the “update” file to “/tmp” of
your AZBox. Use the IP address obtained
in the last step and don’t forget to specify
the password, if required.
using the image in the RAM.
This would somewhat simplify the
recovery procedure.
First test: Image loaded into RAM,
Flash deleted. But when I tried to
flash the RAM with the image, YAMON
refused to cooperate. At this point it
wasn‘t clear why this happened. It
didn‘t matter, I thought.
So, I restarted the receiver and per-
formed the above described procedure
again. Yeah, right! In the heat of the
moment I managed to delete the EN-
TIRE Flash memory including the Boot-
loader. So, it looked like my receiver
would be a paperweight after all. Then
again…
What about JTAG? I wrote about in-
corporating a JTAG interface back in
the 10-11/2011 issue of TELE-audiovi-
sion. Would it work with that? It didn‘t
take me long to figure out everything
that would need to be done:
• The JTAG pin holes are not occupied and need to be un-
soldered. First you have to remove the existing solder and
then solder pins in place.
• A jumper has to be added that deactivates the write-
protection on the Flash memory. It involves bridging R309
located near the processor.
• Two SMD type 103 resistors (quad version) need to be
soldered in.
• The necessary JTAG interface with the parallel port
must be crafted. Four 100K resistors are needed as well as
a DB25 connector.
No problem, I thought, so I immediately sat down at my
work bench. The solder is removed using a soldering iron
and a desoldering pump. There‘s a little trick to clearing out
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