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Re: [Qemu-devel] [PATCH 1.3] ehci-sysbus: Attach DMA context.
From: |
Peter Crosthwaite |
Subject: |
Re: [Qemu-devel] [PATCH 1.3] ehci-sysbus: Attach DMA context. |
Date: |
Tue, 4 Dec 2012 15:16:09 +1000 |
Hi Liming, Gerd,
On Tue, Dec 4, 2012 at 12:50 AM, walimis <address@hidden> wrote:
> On Mon, Dec 03, 2012 at 01:51:00PM +0100, Gerd Hoffmann wrote:
>> 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.
>>
I am using a device tree driven kernel with this:
ps7_usb_0: address@hidden {
compatible = "xlnx,ps7-usb-1.00.a";
dr_mode = "host";
interrupt-parent = <&ps7_scugic_0>;
interrupts = < 0 21 0 >;
phy_type = "ulpi";
reg = < 0xe0002000 0x1000 >;
xlnx,usb-reset = <0xffffffff>;
} ;
ps7_usb_1: address@hidden {
compatible = "xlnx,ps7-usb-1.00.a";
dr_mode = "host";
interrupt-parent = <&ps7_scugic_0>;
interrupts = < 0 44 0 >;
phy_type = "ulpi";
reg = < 0xe0003000 0x1000 >;
xlnx,usb-reset = <0xffffffff>;
} ;
And it now works for me, device successfully attaches to second controller:
| usb 2-1: New USB device found, idVendor=46f4, idProduct=0001
| usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
| usb 2-1: Product: QEMU USB HARDDRIVE
| usb 2-1: Manufacturer: QEMU
| usb 2-1: SerialNumber: 1-1
>>For the linux kernel it shouldn't matter where the usb stick is
>>connected. Assuming it finds both ehci controllers. Does it?
>
Gerd,
Is there any documentation out there on how to tell QEMU on command
line which EHCI you want your usb-storage to attach to?
> The default device tree of linux kernel has only the first ehci controller
> support, so the kernel can't detect the second controller.
> But the usb-storage disk is attached to the second controller, so that
> the disk is failed to be detected by the linux kernel.
>
>
>>
>>> For now, qemu doesn't support two EHCI controller, could we remove the
>>> second
>>> EHCI from xilinx_zynq?
>>
Prefer not. Just need a better kernel and DTB. This was definitely
broken for me recently, but I have pulled patches in my kernel, so I
think this has been fixed by the Xilinx kernel devels.
Regards,
Peter
>>Two controllers should work just fine. I'd suggest to find the root
>
> Yes, they work fine separately, but I don't know how to use them at the
> same time (I mean both controller have device attached) as I have
> mentioned in the another mail.
>
> Liming Wang
>
>>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
>>
>