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Re: [Qemu-devel] [PATCH v2 4/6] hw/sd/pl181: expose a SDBus and connect

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH v2 4/6] hw/sd/pl181: expose a SDBus and connect the SDCard to it
Date: Tue, 6 Feb 2018 13:59:28 +0000

On 6 February 2018 at 13:53, Philippe Mathieu-Daudé <address@hidden> wrote:
> On 02/06/2018 10:06 AM, Peter Maydell wrote:
>> How do you manage to get rid of sdbus_reparent_card()? Raspi
>> needs it for its weirdo multiplexed SD controller setup, and
>> AFAIK we don't have a way to say "this thing is hotpluggable
>> but not by the user" yet...
> The card is hotpluggable, the bus isn't.
> An unique SDBus is created in the bcm2835_peripherals object (model
> closer than hardware), sdhci/sdhost/gpio controllers use it via property
> links.
> What I don't do is checking the gpio selector (sd_fsel), hoping the
> guest isn't nasty enough to use both SD controllers at once...

We do need to honour the sd_fsel -- otherwise newer Linux rpi
kernels don't boot, because they want to use the non-default
SD controller and they select it accordingly. At the moment
this works using sdbus_reparent_card(). (I do vaguely recall
looking at whether this could be done using hotplug but I
forget why I decided it was a bad idea.)

-- PMM

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