Re: [PATCH v5 2/6] hw/sd/sdcard: Allow user-instantiated eMMC

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

On 27/10/25 13:35, Daniel P. Berrangé wrote:
> On Mon, Oct 27, 2025 at 01:23:56PM +0100, Philippe Mathieu-Daudé wrote:
>> On 27/10/25 12:55, Daniel P. Berrangé wrote:
>>> On Fri, Oct 17, 2025 at 02:03:54PM +0200, Jan Kiszka wrote:
>>>> From: Jan Kiszka <jan.kiszka@siemens.com>
>>>>
>>>> Enable user-instantiation so that PCI-attached eMMCs can be created for
>>>> virt machines, for QA purposes for the eMMC model itself and for complex
>>>> firmware/OS integrations using the upcoming RPMB partition support.
>>>
>>> IIUC, the 'emmc' device wants an 'sd-bus' but this commit talks about
>>> it being PCI-attached ?
>>
>> Sigh, it should not, but it got introduced this way and we didn't
>> have time / energy / good reason to rework the code, which currently
>> just works.
>>
>> SD / MMC cards -> plugged over external SD bus
>>
>> embedded MMC cards -> no SD bus, directly mmio-mapped.
>>
>>>
>>> Can you elaborate on / illustrate the usage example for an end user ?
>>
>> Saving time by testing virtual hardware, without having to implement a
>> real model.
> 
> Ok, more specifically, what are the suggested QEMU command line
> args to make use of this with PCI ?

See patch #6 documentation:

+    -drive file=emmc.img,if=none,format=raw,id=emmc-img
+    -device sdhci-pci
+    -device 
emmc,drive=emmc-img,boot-partition-size=1048576,rpmb-partition-size=2097152