Re: [Qemu-devel] [RFC 3/7] sd.c: introduce "start bit" and "busy deasserted" callbacks

[Peter Maydell]

On 10 May 2013 17:10, Igor Mitsyanko <address@hidden> wrote:
> Start bit callback models arrival of first bit of data on card's DAT line.
>
> Busy deasserted callback models releasing of DAT0 line by card when it
> transitions from a programming state to a writing data state.
>
> Both of them will be used for async IO later.

This patch could really use some documentation comments that
clarify the interface between the SD controller and the card
model, so people writing SD controllers know what they have
to implement and what the expected semantics of the callbacks
are.

thanks
-- PMM