Re: [Qemu-devel] [PATCH 0/3] Drop default SD card creation

[Peter Maydell]

On 16 August 2012 15:11, Markus Armbruster <address@hidden> wrote:
> Peter Maydell <address@hidden> writes:
>> As suggested in the recent discussion on Markus' patchset to suppress
>> unused default drives, this patchset cleans up the omap and pxa2xx
>> SD card controllers to behave like the other controllers:
>>  * the init function looks for the next IF_SD drive
>>  * if there isn't one, we start up as a controller with no card
>>    present

> Isn't this an incompatible change?  Before, you get an SD card reader
> backed by an empty BDS default.  You can load/unload cards in the
> monitor.  After, you get an SD card reader that isn't backed by a BDS by
> default.  Device models prepared for that can treat it as permanently
> empty.

Hmm, yes, but most of our SD controllers already act that way.
We should probably fix them all...

So what's the block layer equivalent of drive_get_next() that always
returns us something we can get a bdrv from?

-- PMM