I'm looking for some tips here. Anyone know which module in an AMI Aptio UEFI initializes HD Audio codecs?
I'm doing all this on my p8z77-v_le_plus. My hope is, once I find the module responsible, I can quickly inspect that module in every board in the family and build a correct hda_verb.c for each without actually having one on hand to run autoport on. I'm now able to extract the VBT and USB port configurations straight from vendor firmware image. And if it does something special with its onboard devices, I know which module to load into Ghidra for a deeper look after blowing it apart with uefiextract. However, I'm not yet able to find the part of the firmware that initializes the HDA codec. Based on the two boards I actually own and brought into coreboot, there are setup options within the firmware that touch on the codec, and it certainly is involved on their bringup. One involves the front audio panel and whether a HD Audio or AC97 panel is connected. The setup variables are stored in EFI variable "Setup" with GUID EC87D643-EBA4-4BB5-A1E5-3F3E36B20DA9. There are usually three HDA settings: A main enable, HDA/AC97 front panel selection, and sometimes a SPDIF/HDMI selection. I found their offset within Setup, but I can't find the module that reads the variable(s) and act on them. Currently I use binwalk to scan all the extracted "body.bin" for "Setup" in unicode and try to find those with both signatures, to load them into Ghidra one by one. I'm looking for hints to make the process faster or narrow my scope. Thanks Keith _______________________________________________ coreboot mailing list -- [email protected] To unsubscribe send an email to [email protected]
