L'avis de theo de raadt sur la question est interessant, vu que le projet OpenBSD a longtemps tente d'obtenir de la doc pour ameliorer le support des SUNs.
Voila sa premiere intervention sur misc@openbsd.org a ce sujet:
> We don't need processor docs. That stuff is trivial.
>
> We need *chipset docs*.
>
> And those are still not available under Sun's new program.
>
> So it is STILL a complete matter of reverse engineering.
>
> Same as with Apple, of course: powerpc is trivial. But the chipsets
> on every Apple machine are subtly different, full of bugs, and reading
> Darwin is a terrific waste of time since the code is so horrid, and of
> course, it is all just a maze of workarounds.
>
> Verilog for ultrasparc? Give me a break. We don't care.
En gros, aujourd'hui la majorite de la fonctionnalite d'un systeme est compose d'un processeur et de tous les chipsets l'entourant. Par extension il semble donc plus pratique d'avoir une documentation complete des fonctionnalites d'un CPU et des chipsets qui viennent avec plutot que les 'sources' d'un CPU.
Le mot de la fin de mr de raadt:
>> David Weaver has posted some more stuff, which you might want
>> to read.
>
> None of which matters at all. Years ago Sun refused us
> documentation.
> Nothing has changed.
>
> All Sun is trying to do is act fluffy, when they are not.
# L'avis d'OpenBSD
Posté par panda panda . En réponse à la dépêche SUN libère ses processeurs SPARC. Évalué à 10.
Voila sa premiere intervention sur misc@openbsd.org a ce sujet:
> We don't need processor docs. That stuff is trivial.
>
> We need *chipset docs*.
>
> And those are still not available under Sun's new program.
>
> So it is STILL a complete matter of reverse engineering.
>
> Same as with Apple, of course: powerpc is trivial. But the chipsets
> on every Apple machine are subtly different, full of bugs, and reading
> Darwin is a terrific waste of time since the code is so horrid, and of
> course, it is all just a maze of workarounds.
>
> Verilog for ultrasparc? Give me a break. We don't care.
En gros, aujourd'hui la majorite de la fonctionnalite d'un systeme est compose d'un processeur et de tous les chipsets l'entourant. Par extension il semble donc plus pratique d'avoir une documentation complete des fonctionnalites d'un CPU et des chipsets qui viennent avec plutot que les 'sources' d'un CPU.
Le mot de la fin de mr de raadt:
>> David Weaver has posted some more stuff, which you might want
>> to read.
>
> None of which matters at all. Years ago Sun refused us
> documentation.
> Nothing has changed.
>
> All Sun is trying to do is act fluffy, when they are not.