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Hardware root/JTAG pinout

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By Determined, Junior Member on 29th April 2014, 01:22 AM
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17th May 2014, 12:08 AM |#21  
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Quote:
Originally Posted by jcase

I spent a bit trying today, I never could get a response from RTCK at all

Ignore it, RTCK is not always available and JTAG works without it as long as your clock is within acceptable range. I used 1000khz-3000khz. Don't know if clock is configurable in riffbox that I believe you use. Also, does riffbox support 1.8v levels?
 
 
17th May 2014, 12:54 AM |#22  
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Quote:
Originally Posted by Determined

Ignore it, RTCK is not always available and JTAG works without it as long as your clock is within acceptable range. I used 1000khz-3000khz. Don't know if clock is configurable in riffbox that I believe you use. Also, does riffbox support 1.8v levels?

Clock is configurable, I believe it does 1.8 but I'm not home now so can't verify

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17th May 2014, 07:29 PM |#23  
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Hi!

One noob question, if you can develop a root method or a way to flash the device using jtag, what kind of device will be necessary to do it?

something like this? http://dangerousprototypes.com/docs/Bus_Blaster

thanks!
10th June 2014, 04:34 PM |#24  
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Any advances with JTAG?

thanks!
4th July 2014, 08:50 AM |#25  
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Quote:
Originally Posted by Determined

Connecting to JTAG with OpenOCD needs a few changes in the cortex_a.c source to enable support for Cortex-A15. If you actually make those changes and play with debug registers, you will discover that DBGEN and SPIDEN signals/fuses are disabled, so debug mode is not accessible.

I have not yet tried flashing.

that's not true, i currently play with openocd, flyswatter2 and ifc6410 (another apq8064 box) and i discovered, that problem is how openocd handles writing to crtlstat register. seems openocd implements dap ver. 0 way, but not dap ver. 1 and dap ver. 2 ways. i'm currently diving to arm coresight documentation and openocd code.
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4th July 2014, 03:57 PM |#26  
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Quote:
Originally Posted by cz172638

that's not true, i currently play with openocd, flyswatter2 and ifc6410 (another apq8064 box) and i discovered, that problem is how openocd handles writing to crtlstat register. seems openocd implements dap ver. 0 way, but not dap ver. 1 and dap ver. 2 ways. i'm currently diving to arm coresight documentation and openocd code.

Good to know that somebody is working in JTAG solution for AFTV box. Let us know your findings!

Thanks!
26th March 2015, 09:19 PM |#27  
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Long time ago since last post?
Hi there folks,

is there any progress in finding a reliable jtag connection, i. e. with a busblaster to root it?
Found http://forum.xda-developers.com/fire...-chip-t2885344 which is of core a little bit risky in doing it because of http://forum.xda-developers.com/fire...8#post55673788

I know I can solder but I dont have the other required hardware especially the emmc-adapter to make the connection with the flash chip on the board.
I do have a busblaster and I did some JTAG on a pogoplug. It worked well with OpenOCD.
So know I just want to know if somebody is working on it because it would be a pleasure to me to get a rooted FireTV.
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