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Re: [Qemu-devel] [PATCH] Make rtl8139 network interface card compatible
From: |
Mark Cave-Ayland |
Subject: |
Re: [Qemu-devel] [PATCH] Make rtl8139 network interface card compatible with Mac OS 10.4 |
Date: |
Wed, 30 Dec 2015 16:58:19 +0000 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Icedove/38.4.0 |
On 30/12/15 16:47, Programmingkid wrote:
> I did disable the change I made to the pci_dma_read() function and applied
> this
> patch to OpenBIOS. It makes Mac OS X stop booting. This is the message it is
> stuck at when Zoltan's patch is applied:
> mig_table_max_displ = 70
>
> I even removed the rtl8139 from QEMU's options and Mac OS X still stopped
> booting
> at the same exact spot.
Okay. I've just posted a revised patchset to the OpenBIOS list which may
(or may not) help, so please test with that aswell to see if it makes a
difference.
>> It looks like we have to face up to the reality that Apple's OF
>> implementation likes to enable bus mastering for some cards and emulate
>> this behaviour in OpenBIOS, since because of this some drivers don't
>> explicitly enable bus mastering and so fail under emulation.
>>
>> I'll go back and revisit Zoltan's patches to see if we can come up with
>> something that works better for OpenBIOS upstream. In the meantime I
>> still can't quite work out why you still need to swap the BARs around as
>> AFAICT both the mmio and io BARs are mapped onto the chip registers -
>> any chance you could add some debugging to QEMU in order to figure out
>> what is going wrong without your patch?
>
> I have done a lot of debugging. With only the pci_dma_read() change applied
> to QEMU, nothing the Mac OS X driver does ever accesses any of the functions
> from the rtl8139.c file (as far as I can tell). I will add that when this
> code "if ( csrRead8( RTL_CM ) & R_CM_RST )" is executed by the driver, the
> value is 16. It appeared to be pretty consistent. The value returned by just
> "csrRead8( RTL_CM )" is 24.
Right, so then the question to ask is what is the difference in
behaviours both before and after the BAR swap? It seems that you're
getting a value back but presumably it must be a different value with
your patch applied.
ATB,
Mark.
- [Qemu-devel] [PATCH] Make rtl8139 network interface card compatible with Mac OS 10.4, Programmingkid, 2015/12/29
- Re: [Qemu-devel] [PATCH] Make rtl8139 network interface card compatible with Mac OS 10.4, Mark Cave-Ayland, 2015/12/29
- Re: [Qemu-devel] [PATCH] Make rtl8139 network interface card compatible with Mac OS 10.4, Programmingkid, 2015/12/29
- Re: [Qemu-devel] [PATCH] Make rtl8139 network interface card compatible with Mac OS 10.4, Programmingkid, 2015/12/29
- Re: [Qemu-devel] [PATCH] Make rtl8139 network interface card compatible with Mac OS 10.4, Mark Cave-Ayland, 2015/12/30
- Re: [Qemu-devel] [PATCH] Make rtl8139 network interface card compatible with Mac OS 10.4, Programmingkid, 2015/12/30
- Re: [Qemu-devel] [PATCH] Make rtl8139 network interface card compatible with Mac OS 10.4,
Mark Cave-Ayland <=
- Re: [Qemu-devel] [PATCH] Make rtl8139 network interface card compatible with Mac OS 10.4, Programmingkid, 2015/12/30
- Re: [Qemu-devel] [PATCH] Make rtl8139 network interface card compatible with Mac OS 10.4, Mark Cave-Ayland, 2015/12/31
- Re: [Qemu-devel] [PATCH] Make rtl8139 network interface card compatible with Mac OS 10.4, Programmingkid, 2015/12/31
- Re: [Qemu-devel] [PATCH] Make rtl8139 network interface card compatible with Mac OS 10.4, Mark Cave-Ayland, 2015/12/31
- Re: [Qemu-devel] [PATCH] Make rtl8139 network interface card compatible with Mac OS 10.4, Programmingkid, 2015/12/31