EMD-041 Flash Controller ScCmd Response Error

[asdrubale]

Hello everyone,

Lately, I seem to be getting nothing but nightmare boards. I received an EDM-041 board that had already been worked on by another technician. It arrived without the BIOS chip (which I rebuilt), without the retimer (which I reinstalled), and without the W2251 60NGDTO, which I sourced from a donor board.

However, I have not been able to get it to boot. The power-up sequence progresses to approximately 130 mA, and I get the following UART error:

80871060 FFFFFFFF FFFF0042 10000000 2039 0000 FFFF FFFF:25 (Flash Controller: Flash Controller ScCmd Response Error)

I tried replacing the CXD90070G, but I get exactly the same error. Just to rule it out, I also replaced the DDR4 memory module, but that made no difference—the error remains unchanged.

All voltages and voltage drops around the RT5127 are within spec. I cannot find any shorts on any of the main lines routed through the CXD90070G. The voltage-drop measurements on the data lines going to the APU also appear normal.

I’m reaching out to anyone who has experience with this specific error code. Is there anything else I should check that I may have overlooked?

Thanks in advance.