Re: [RFC PATCH 9/9] hw/sd: Allow card size not power of 2 again

[Peter Maydell]

On Thu, 24 Jun 2021 at 11:27, Tom Yan <tom.ty89@gmail.com> wrote:
> I really think we should get (/ have gotten) things clear first. What
> exactly is the bug we have been talking about here? I mean like, where
> does it occur and what's the nature of it.
>
> 1. Is it specific to a certain type / model of backend / physical
> storage device that will be made use of by qemu for the emulated
> storage? (I presume not since you mention about image, unless you
> irrationally related/bound the emulated storage type and the physical
> storage type together.)
>
> 2. Does it have anything to do with a certain flaw in qemu itself?
> Like the code that does read/write operation is flawed that it cannot
> be handled by a certain *proper* backend device?
>
> 3. Or is it actually a bug in a certain driver / firmware blob that
> will be used by an *emulated* device in the guest? In that case, can
> we emulate another model so that it won't be using the problematic
> driver / firmware?

Definitely agreed -- before we start changing QEMU code we need
to identify clearly (a) what the real hardware does and (b) what
the situation was we were originally trying to fix.

thanks
-- PMM