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Re: [Qemu-devel] [Qemu-ppc] BUG: qemu-system-ppc boots Mac OS 9.2.1/9.2.

From: Thomas Huth
Subject: Re: [Qemu-devel] [Qemu-ppc] BUG: qemu-system-ppc boots Mac OS 9.2.1/9.2.2 iso's extremely slow
Date: Tue, 7 Mar 2017 09:06:40 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0

On 06.03.2017 22:49, Howard Spoelstra wrote:
> Hi,
> I noticed qemu-system-ppc currently has difficulty booting Mac OS
> 9.2.1/9.2.2 iso's. Even after 5 minutes the happy mac hasn't appeared.
> This does not happen with 9.0.4 or 9.1 iso's, or PPC OS X versions.
> I bisected to this commit:
> 95ed56939eb2eaa4e2f349fe6dcd13ca4edfd8fb is the first bad commit
> commit 95ed56939eb2eaa4e2f349fe6dcd13ca4edfd8fb
> Author: Li Qiang <address@hidden>
> Date:   Tue Feb 7 02:23:33 2017 -0800
>     usb: ohci: limit the number of link eds
>     The guest may builds an infinite loop with link eds. This patch
>     limit the number of linked ed to avoid this.
>     Signed-off-by: Li Qiang <address@hidden>
>     Message-id: address@hidden
>     Signed-off-by: Gerd Hoffmann <address@hidden>
> After reverting boot time is ~20 seconds.
> It seems setting "#define ED_LINK_LIMIT 4" in hw/usb/hcd-ohci.c to a
> higher limit solves this issue.

Could you maybe find out the lowest value for that define which is still
working fine with that version of Mac OS ?


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