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[Bug 1895895] Re: Attaching SD-Card to specific SD-Bus Sabrelite (ARM)

From: Peter Maydell
Subject: [Bug 1895895] Re: Attaching SD-Card to specific SD-Bus Sabrelite (ARM)
Date: Mon, 23 Nov 2020 19:04:15 -0000

The fsl-imx* SoC devices need to create aliases onto the sd-buses with
unique names; see discussion here:


** Changed in: qemu
       Status: New => Confirmed

** Tags added: arm

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  Attaching SD-Card to specific SD-Bus Sabrelite (ARM)

Status in QEMU:

Bug description:
  Currently, I am looking for a method of attaching an sd-card to a
  specific bus as opposed to defaulting to the first.

  QEMU Version: 5.0.0
  Specifically trying to use qemu-system-arm binary

  Running an "info qtree" shows the output seen in the attached image. I have 
attempted multiple different combinations of arguments to attempt to get the 
sd-card to appear on the FOURTH sd-bus but no luck. The machine type being used 
is Sabrelite. It should be noted that I was able to PATCH QEMU to achieve the 
result I expected but I had hoped this functionality was already available and 
did not require modification to QEMU itself.

  For reference, this is the patch that was made to source to allow the card to 
attach to a specific bus. After the change was made, an sd-card could be 
attached to a bus with the following flags:

  -drive file=sdcard.img,format=raw,id=mycard -device sd-

  diff qemu-5.1.0.orig/hw/sd/sdhci.c qemu-5.1.0/hw/sd/sdhci.c
  >     static int index=0;
  >     char name[64];
  >     sprintf(name, "sd-bus.%d", index++);
  <                         TYPE_SDHCI_BUS, DEVICE(s), "sd-bus");
  >                         TYPE_SDHCI_BUS, DEVICE(s), name);

  If there is a way to attach an sd-card to the specific bus that does
  NOT require this change, I'd appreciate it.

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