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

[Alexander Graf <agraf@suse.de>]

On 30.06.14 21:14, John Snow wrote:
> 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.

I honestly don't remember :). We do unset the error bit once we get the 
first working command though.


Alex