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Re: [Qemu-devel] Commit b2a575a1c652 broke i486 support.
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] Commit b2a575a1c652 broke i486 support. |
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Date: |
Wed, 31 May 2017 14:34:08 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.0 |
On 30/05/2017 21:05, Rob Landley wrote:
> On 05/29/2017 05:14 AM, Richard W.M. Jones wrote:
>> I see in the disassembly use of cmovne (new in Pentium Pro) and
>> bswap (new in 486).
>> [http://cse.unl.edu/~goddard/Courses/CSCE351/IntelArchitecture/InstructionSetSummary.pdf]
>>
>> The cmovne instruction is generated by the compiler (GCC in my case),
>>
>> The following patch removes the cmovne instruction, so it should work
>> on 486 (although I didn't test it). It's not possible to remove bswap
>> without surgery on the inline assembler.
>
> Is there any way to make it just _not_ load the option rom for -cpu 486?
> It ran fine before that thing went in...
You were loading another option ROM. Thomas's suggested -global
invocation will revert to that ROM until we fix it.
Paolo