820 3330 - need U3900 bypass to get SD reader working.

[Alan.L]

Firewire and ethernet were shorted on PPBUS. i had to dig a massive hole to remove the short. i also have to disable U3900 because PP1v2_enet line is also shorted.

now the board doesn't have firewire, ethernet and SD card. Why does SD card require U3900 for data connection??? anyway, to bypass u3900 so it doesn't care about sd wake?

besides 3 problems, the board is fully working without error.

 

[2informaticos]

As per schematic, SD Card connector lines go directly to U3900 (BCM57765B0), which is also Ethernet controller.
Remove R3943, to prevent wake issue.

 

[Alan.L]

ok, i'll remove it. so RIP SD reader.

 

[2informaticos]

SD card reader communicates with PCH via SPI protocol, through U3900.
SD to USB adapter is the only solution left...