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Re: [Qemu-devel] [PATCH 1.3] ehci-sysbus: Attach DMA context.
From: |
Gerd Hoffmann |
Subject: |
Re: [Qemu-devel] [PATCH 1.3] ehci-sysbus: Attach DMA context. |
Date: |
Mon, 03 Dec 2012 13:51:00 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:10.0.11) Gecko/20121116 Thunderbird/10.0.11 |
Hi,
> As said in another mail, I found that the root cause is that xilinx_zynq has
> two EHCI controller. If we use usb-storage disk, the disk will be attached to
> the second EHCI controller, which the kernel uses the first EHCI controller
> by default.
For the linux kernel it shouldn't matter where the usb stick is
connected. Assuming it finds both ehci controllers. Does it?
> For now, qemu doesn't support two EHCI controller, could we remove the second
> EHCI from xilinx_zynq?
Two controllers should work just fine. I'd suggest to find the root
cause instead of doctoring like this. ehci + usb core are fine with two
controllers & busses, maybe the arch plumbing (device tree?) misses
something so the linux kernel doesn't find the second ehci controller.
cheers,
Gerd