On 10.09.21 00:44, Jack Fivedock wrote:
Much appreciated. Sorry for the lack of knowledge here, I'm very new to this. I see in the data sheet the command I need to enter to enable WREN but I'm not sure how to issue this command to the chip?
Sorry, you're on the wrong track. This command is simply send before every attempt to write, always. So that's nothing specific to your chip that flashrom could miss.
Maybe we should back up. You mentioned you were using a special connec- tor:
Using this cable from Chipset pro to connect to the hirose 12 pin EFI connector on the macbook pro.
This made me assume that there can't be any physical issue because this connector is made for flashing. But maybe it isn't, or maybe you are using it wrong. Is there any public documentation about this connector?
One thing that could go wrong is the voltage supply. If you can, you should check if the voltage drops once the flash is connected. If it drops below a certain level, it's possible that the chip would still answer to commands, but a protection circuit would prevent any write attempt.
Looking at the datasheet, this chip has a "individual block protection" mode, selected by a write-once WPSEL bit in a security register. AIUI, the state can be read with the RDSCUR (read security register) command. If WPSEL (bit 7) is set, a WREN + GBULK (gang block unlock) command sequence should allow to write.
I'm sorry, I can't provide any patch or details about the code right now. But the above should provide a starting point for anyone else who wants to help. You could also drop in on IRC, especially helpful if you want to talk about the code.
Nico
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Nico Huber