Re: [Qemu-devel] cmdline: How to connect a SD card to a specific SD controller?

[Thomas Huth <thuth@redhat.com>]

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On 30.05.2018 01:08, Philippe Mathieu-Daudé wrote:
> On 05/28/2018 01:30 AM, Philippe Mathieu-Daudé wrote:
>> Hi,
>>
>> I'd like to connect a specific SD card to a specific SDHCI from command
>> line, and I'm getting a bit lost with command line options.
>>
>> I'm using an updated version of this patch, but this is not relevant to
>> this thread:
>> http://lists.nongnu.org/archive/html/qemu-devel/2018-05/msg01914.html
>>
>> In the following example, I'd like to connect an UHS-I enabled SD card
>> to the first SHDCI of the Exynos4210 board (Nuri).
>>
>> I tried:
>>
>> $ ./arm-softmmu/qemu-system-arm -M nuri \
>>   -device sd-card,id=sd0,uhs=1 \
>>   -drive if=sd,id=sd0,driver=null-co,size=4G \
>>   -monitor stdio -S
> 
> Peter suggested on IRC to use:
> 
>   -drive if=none,id=mydrive,... -device sd-card,...,drive=mydrive
> 
> which indeed works enough for my tests:
> 
>   $ ./arm-softmmu/qemu-system-arm -M nuri \
>     -drive if=none,id=mydrive,driver=null-co,size=4G \
>     -device sd-card,id=sd0,uhs=1,drive=mydrive \
>     -monitor stdio -S
> 
> The same issues are still here but don't bother:
> 
> (qemu) info qtree
> bus: main-system-bus
>   type System
>   dev: generic-sdhci, id ""
>     gpio-out "sysbus-irq" 1
>     sd-spec-version = 2 (0x2)
>     uhs = 0 (0x0)
>     capareg = 99090560 (0x5e80080)
>     maxcurr = 0 (0x0)
>     pending-insert-quirk = false
>     dma = ""
>     mmio 0000000012540000/0000000000000100
>     bus: sd-bus
>       type sdhci-bus
>       dev: sd-card, id "sd0"
>         drive = "mydrive"
>         spi = false
>         uhs = 1 (0x1)
>       dev: sd-card, id ""
>         drive = ""
>         spi = false
>         uhs = 0 (0x0)
> 
>         ^---- 2 cards

Looks like the nuri board always creates an sd-card by default? You
could try to change exynos4210_init() to only create it if
drive_get(IF_SD, ...) is not returning NULL - then it should be possible
to disable it with "-nodefaults".

 Thomas


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