[Qemu-devel] AHCI / Sata port initial error status

[John Snow]

I am in the process of writing a series of AHCI tests (for q35) that 
compare the written specifications against what the current device 
emulation actually does, and I was curious about this bit instead of 
ahci.c, in ahci_reset_port:

ide_state->error = 1;

What does this error signify, exactly, and why is it set by default on 
ports with a device attached? It trickles up inside of the PxTFD.ERR 
byte in the HBA as well as showing up in the initial Register D2H FIS 
after the PxCMD.FRE bit is set.

Thank you,
--John.