Re: [Freedos-devel] VME Broken on AMD Ryzen

[Rugxulo <ru...@gm...>]

Hi,

On Fri, May 12, 2017 at 11:29 AM, Matej Horvat
<mat...@gu...> 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.