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Re: [Qemu-ppc] [PATCH] Changes default cdrom options to work better with
From: |
Alexander Graf |
Subject: |
Re: [Qemu-ppc] [PATCH] Changes default cdrom options to work better with Mac OS X. |
Date: |
Sun, 23 Jun 2013 18:38:58 +0200 |
Am 23.06.2013 um 14:37 schrieb Programmingkid <address@hidden>:
>
> On Jun 22, 2013, at 9:20 PM, Alexander Graf wrote:
>
>>
>> On 23.06.2013, at 03:14, Programmingkid wrote:
>>
>>>
>>> On Jun 22, 2013, at 9:08 PM, Alexander Graf wrote:
>>>
>>>>
>>>> On 23.06.2013, at 03:04, Programmingkid wrote:
>>>>
>>>>> This patch makes the default cdrom options more compatible with Mac OS X.
>>>>>
>>>>> With this patch I was finally able to see "Got boot device" printed by
>>>>> Darwin 8! This made the installer for Darwin 8 actually show up in QEMU.
>>>>>
>>>>> signed-off-by: John Arbuckle <address@hidden>
>>>>>
>>>>> ---
>>>>> vl.c | 2 +-
>>>>> 1 files changed, 1 insertions(+), 1 deletions(-)
>>>>>
>>>>> diff --git a/vl.c b/vl.c
>>>>> index a8dc73d..cb53656 100644
>>>>> --- a/vl.c
>>>>> +++ b/vl.c
>>>>> @@ -3085,7 +3085,7 @@ int main(int argc, char **argv, char **envp)
>>>>> qemu_opts_set(qemu_find_opts("machine"), 0, "dtb", optarg);
>>>>> break;
>>>>> case QEMU_OPTION_cdrom:
>>>>> - drive_add(IF_DEFAULT, 2, optarg, CDROM_OPTS);
>>>>> + drive_add(IF_IDE, 0, optarg, CDROM_OPTS);
>>>>
>>>> Consider me puzzled. Why is IF_DEFAULT and different from IF_IDE on
>>>> g3beige?
>>>>
>>>>
>>>> Alex
>>>
>>>
>>> Because IF_DEFAULT is equal to -1 and IF_IDE is equal to 0. Their
>>> definition is in blockdev.h.
>>
>> So? The default block bus on g3beige is IDE, so IF_DEFAULT should behave
>> identical to IF_IDE.
>
> Sounds like a good idea.
>
>>
>> The real change you did was to go from "2" to "0". So instead of attaching
>> the CD-ROM to hdc (on cmd646) you now attach it to hda (on mac-io).
>>
>> So the real underlying problem is that we expose the second IDE channel on a
>> cmd646 IDE controller, not mac-io. I think we did this back then to support
>> booting at all, because the mac-io emulation was so broken that booting from
>> CD-ROM simply didn't work. I guess it's time to switch back ...
>
> Yes, using mac-io is the best thing to do now.
>
> One of the last major problems with making Mac OS X boot in QEMU is with a
> function called IOSleep(). This is an XNU function that does not work
> correctly. Whenever a call to this function is made, the kernel pauses for a
> much longer time than it should. This will have to be fixed somehow.
This is probably because you have a local patch to override tbfreq, right? :)
Alex
Re: [Qemu-ppc] [PATCH] Changes default cdrom options to work better with Mac OS X., Mark Cave-Ayland, 2013/06/24