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VME Broken on AMD Ryzen

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VME Broken on AMD Ryzen

Matej Horvat
"To be clear, the problem is not at all specific to virtualization. It has  
been confirmed on a Ryzen 5 1500X running FreeDOS—which comes with the  
JemmEx memory manager, which enables VME by default. Until VME was  
disabled, any attempt to boot with JemmEx failed with invalid opcode  
exceptions. After disabling VME, FreeDOS worked normally."

http://www.os2museum.com/wp/vme-broken-on-amd-ryzen/

Should the FreeDOS Web site warn users about this? Should JEMMEX or the  
FreeDOS installer work around this?

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Re: VME Broken on AMD Ryzen

Rugxulo
Hi,

On Fri, May 12, 2017 at 11:29 AM, Matej Horvat
<[hidden email]> wrote:
>
> "To be clear, the problem is not at all specific to virtualization. It has
> been confirmed on a Ryzen 5 1500X running FreeDOS—which comes with the
> JemmEx memory manager, which enables VME by default. Until VME was
> disabled, any attempt to boot with JemmEx failed with invalid opcode
> exceptions. After disabling VME, FreeDOS worked normally."
>
> http://www.os2museum.com/wp/vme-broken-on-amd-ryzen/

It basically says mask out the VME bit when running XP/2k3 under a VM,
and that this bug is almost certainly fixable in a microcode update.

> Should the FreeDOS Web site warn users about this?

Doubtful (unless you think AMD won't fix this any time soon).

> Should JEMMEX or the FreeDOS installer work around this?

Just use "NOVME", and don't worry about it.

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Re: VME Broken on AMD Ryzen

Alain Mouette


On 12-05-2017 16:14, Rugxulo wrote:
>> Should JEMMEX or the FreeDOS installer work around this?
> Just use "NOVME", and don't worry about it.
Could you please explain that...

Alain


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Re: VME Broken on AMD Ryzen

Ralf Quint
On 5/12/2017 4:33 PM, Alain Mouette wrote:
>
> On 12-05-2017 16:14, Rugxulo wrote:
>>> Should JEMMEX or the FreeDOS installer work around this?
>> Just use "NOVME", and don't worry about it.
> Could you please explain that...
>
Use that parameter when you load JEMMEX, as per instructions

http://help.fdos.org/en/hhstndrd/base/jemmex.htm

Ralf ;-)

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Re: VME Broken on AMD Ryzen

Rugxulo
Hi,

On Fri, May 12, 2017 at 6:36 PM, Ralf Quint <[hidden email]> wrote:

> On 5/12/2017 4:33 PM, Alain Mouette wrote:
>>
>> On 12-05-2017 16:14, Rugxulo wrote:
>>>> Should JEMMEX or the FreeDOS installer work around this?
>>> Just use "NOVME", and don't worry about it.
>> Could you please explain that...
>>
> Use that parameter when you load JEMMEX, as per instructions
>
> http://help.fdos.org/en/hhstndrd/base/jemmex.htm
>
> Ralf ;-)

"
 VME/NOVME  options will enable/disable using the V86 Mode Extensions
            on Pentium+ CPUs. These options can be set from the command line.
"

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