[TUHS] Thoughts on Licenses
kevin.bowling at kev009.com
Mon Jul 4 02:55:04 AEST 2022
On Sun, Jul 3, 2022 at 9:27 AM Clem Cole <clemc at ccc.com> wrote:
> On Sun, Jul 3, 2022 at 11:30 AM Bakul Shah <bakul at iitbombay.org> wrote:
>> You may be thinking of MINIX 1. It was a from-scratch implementation that
>> was syscall compatible with V7 but IIRC it didn't have any sort of memory
>> protection as it was designed to run on 8088.
> Minux and specifically M1 was and always has been, a uK. And yes, M1 does
> not need an MMU - since it was designed to run on an 8088. IIRC this was
> Linus' original objection when he wanted to run on his 386-based PC (Wyse
> 32:16 box, IIRC). The key was Andy wanted to teach his students about V7
> without running afoul of the AT&T license as Lions had with V6.
> What runs on the Intel Management Engine
> It's called the Intelligent Platform Management Interface
> - *a.k.a.* IPMI
IPMI is an entirely different subsystem from the ME.
ME runs on one of at least two superfluous x86 cores within the CPU die of
intel CPUs for a while that can run Intel and vendor supervisors. When
this blew up in Intel’s face several years ago Minix 3 was the latest
IPMI is a sideband and could be anything including embedded Linux on a
dedicated ARM SoC which is common in large scale installations.
is MINIX 3, ... with NetBSD userland.
> Actually, if you want to pick nits, neither statement is correct (remember
> for whom I work).
Maybe you are talking about something else. Minix 3 (Andy’s last OS) does
indeed match this description, uK with NetBSD user.
MINIX 1 and MINIX 3 are related
> That's because M3 added the MMU support that M1 lacked. But there is
> nothing in M3 that IPMI is using other than it is the current version from
> Andy's team. What IPMI has as an underlying uK is heavily hacked and is a
> 'derivative work' - the local uk is basically providing V7 interfaces to
> some special programs.
> It made little sense to recreate something for the platform engine, and
> Minux was picked because it was smaller than any of the *BSDs and was not
> GPL'ed so Intel IP was still protected.
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