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Re: [Qemu-devel] ppce500 usb-ehci-pci issue on last uboot

From: Gerd Hoffmann
Subject: Re: [Qemu-devel] ppce500 usb-ehci-pci issue on last uboot
Date: Tue, 14 Nov 2017 14:33:49 +0100
User-agent: NeoMutt/20171027

> >How can this be reproduced?
> or just download my last e500 uboot build from here 
> https://www.dropbox.com/s/xxlu6ivg3izlqvu/u-boot?dl=0
> qemu-system-ppc64 -M ppce500 -cpu e5500 -m 512 -bios (path to the uboot 
> image) -device usb-ehci (or another qemulated ehci pci device)  -serial stdio
> when the machine  run and you have the uboot prompt just do "usb
> start" and you will see the hang for some second of the machine and
> after the report from uboot of an error of the ehci.

Finally found the time to look at this.  Seems to not be ehci-related at
all.  ehci doesn't see any mmio activity.

>From "info mtree" monitor command:

memory-region: pci bus memory
  0000000000000000-ffffffffffffffff (prio 0, i/o): pci bus memory
    0000000000080000-0000000000080fff (prio 1, i/o): ehci
    0000000c00004000-0000000c00007fff (prio 1, i/o): virtio-pci

memory-region: system
  0000000000000000-ffffffffffffffff (prio 0, i/o): system
    0000000000000000-000000001fffffff (prio 0, ram): mpc8544ds.ram
    0000000c00000000-0000000c1fffffff (prio 0, i/o): alias PCI Outbound Window 
1 @pci bus memory 0000000c00000000-0000000c1fffffff

Seems the ehci mmio bar is mapped outside the pci window, so the cpu
can't access it ...


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