Jonah Probell has written a history of Lexra. After searching with a multimeter I could not find where the JTAG pins broke out to on the PCB – I would have expected a bunch of pads or holes for an unused header to provide easy access to the signals. Personal tools Create account Log in. That’s all for tonight. Type “help” for help. Jonah Probell has written a history of Lexra Contents.

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This is a shame. On the Minitar board this can be achieved by shorting out R28 on the underside. This weekend should bring some interesting results. Retrieved from ” ftl8181 If you don’t ftl8181 access to one then the schematic is provided freely for it here. This resulted in the end of Lexra’s former products and so at this time there also seems to be little interest in actually adding Linux support. Technically support for Lexra processors without adding emulation of these instructions would be possible but the question is how much sense it would make as some software may rely on it fairly heavily.

Linux on Realtek RTL

With the Xilinx unit I noticed there seemed to be inordinately short data chains ie Later the LX core added hardware multithreading. In the next rtll8181 or so I hope to dig a little further with this tool so see what I can discover.

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Lexra therefore choose to implement these instructions by software emulation. Pin when pulled to ground sets the processor into JTAG mode.

Several key employees of Lexra founded the digital video core company Ultra Data Corporationthe intellectual property assets of which have since been acquired. This would be a faster and cheaper way than using slow old JTAG to program the boards.

Realtek SOC

Which means it isn’t clear if Linux can or cannot legally emulate the instructions. I got my mitts on a real life Macraigor parallel port Wiggler and reran the jtag program and got some more positive results. Type “quit” to exit! Personal tools Create account Log in. All the parts should be available at a good electronics store such as Jaycar I’ll have to give the pod back and make one up myself.

No doubt some code will have to be written to support the RTL properly, but the best thing would be the BSDL file from Realtek which would be an enourmous help and allow things like FLASH reprogramming and possibly debugging with gdb. Type “help” for help. The interface is a bog standard IEEE JTAG Tools may damage your hardware! That’s all for tonight. The manufacturers ID of the chip looks like it’s surprise surprise and the part number is 6. Noteworthy architectural feature was the lack of the MIPS I instructions lwl, lwr, swl and swr that optimize the handling of unaligned loads.

Jonah Probell has written a history of Lexra. After searching with a multimeter I could not find where the JTAG pins broke out to on the PCB – I would have expected a bunch of pads or holes for an unused header to provide easy access to the signals. Lexra did implement a bit variant of the MIPS architecture. Cavnex have kindly sent me their parallel port JTAG interface and their own software that is Lexra compatible!

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When you run jtag make sure you have privileges to the parallel port and make sure the parallel port is running in EPP mode usually the default case but can be set in your BIOS.

Realtek RTL8181 JTAGing

Today Lexra is a defunct company. I have used a Minitar AP board that someone had given me after accidentally overwriting the bootblock with the wrong flash command.

As can be seen below there are too many registers missing. This time I have had more luck and as you can see the 96 bit register is probably the boundary scan chain. You can see this on the clearly in the photo.

You can see in the picture below that I had to solder fine green wire onto a single inline header.