[weblacky]

Hi Jan-Jaap,

now I have finally managed to get machine running at 800 MHz, not keen to take it back to 600 MHz….

Seriously though this CPU module was originally shipped from China (Shanghai) in Feb 2021.  Is has taken 8 months to get to me. The package was badly handled and a lot of stuff was smashed / bent.  The CPU module survived, but with lots of squashed pins on CPU connector, as well as cracked connector plastic. I very carefully unbent the pins with very fine tweezers and gave it a go, not expecting it would boot. But I got lucky and it was ok, so did flash to get it back running at 800 MHz.  As the connector is now in poor condition I am not keen to take it back out at the moment.

Based on prior very old posting from Nekochan (and Hamei at start of this thread), the only way to recover a Fuel board that has been flashed to higher clock speed is to put a module of right speed into the machine and then use that to down flash it to lower speed. Then swap in the slower CPU module.

As part of shipment from China, I also got the Fuel system board that went with CPU, but that has got at least one capacitor ripped off board and a lot of very badly bent fan and cable pins. I might see if I can set this up as bench test machine.. then I could play with that and slower CPU.

Likely a task beyond my repair skills.

EDIT #1: looking at log and seeing this running, the flash is doing more than just putting a couple of values in an eeprom. It first wiped the “Bedrock PROM” (which had already been written to 14 time according to log) and then rewrote to this (Writing 1476168 bytes of data). So if people are looking for the undocumented POD way of doing this then it would likely be knowing offset and value to stuff data into “Bedrock PROM”.

EDIT #2: thinking about this a bit more…. On O350 Chimera, the Bedrock ASIC (had hence the referenced PROM) is on the removable CPU board, not the system interface board. That is why the PROM and board go together as one and there is no need to flash PROM cpu speed when you swap an O350 CPU board over. On Fuel the Bedrock is on system board and not the PIMM. So separation of these creates need for flashing of Bedrock PROM. Me thinks, the PROM is not on the IO9 board, so looking for one there is not going to find the common Bedrock related components. So to find common components you need to look at Fuel system board and O350 CPU boards….

Cheers from Oz,

jwhat/John.

jwhat,
Please provide photos of the damaged areas of that board.  When I do my Fuel board I can make notes and pics of what components you need.