[weblacky]

So I can answer half of this after really paying attention to your posts..I should have seen this sooner.

The DS2505 is a special chip that cannot be reprogrammed (one-time data add only). Data is written in something similar to records to this chip. You can always append additional records to a chip but you cannot reclaim the areas that previous records have been written. I don’t know if you can nullify old records by putting in newer records. The point is, you put in a line of data at a time into this chip or more. You don’t flash the entire chip at once. Once that data is on the chip, it’s there forever. Cannot be reprogrammed. It’s still write-once for each storage region on the chip.


SGI often uses it to carry the board’s part # and other data needed early by PROM.  If you have a board part number for this device your troubleshooting show on hinv then likely the DS2505 works. It requires a special programmer to even program that chip the first time that you’ll never get today.  I briefly talked with another SGI forum user about this chip because it’s also used in Octane CPU modules to carry CPU ID data.  SGI loved these chips, and they rarely fail (really). So you’ll find them in several systems peripherals.

I believe it’s also way too small for your data.

Print page 253: https://bukosek.si/hardware/collection/s...ooklet.pdf

“Code+data length:0x1caac”

Which should be like 117Kb?

If you actually verify how big the tport.bin file is, it should be larger than 16Kb, yes?

So I can 100% tell you that there is no way to reprogram a DS2505 on board of system. Not possible. Not supported.  So your EEPROM cannot be the DS2505.

But this doesn’t 100% verify your other chip is the one you’re looking for.