Messages in this thread | | | Date | Fri, 26 Jun 2009 17:00:51 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH 3/9] x86/moorestown: add moorestown platform flags |
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* Ingo Molnar <mingo@elte.hu> wrote:
> And? There's an obvious quality difference between various > platform enumeration methods - and we strive for the highest > quality methods. > > Using boot flags is one of the lowest quality enumeration methods > and the fact that there's precedence for it in other architectures > is not a technical reason to make the same mistakes on x86 too. > > Especially here where there's two other enumeration methods easily > available: SFI and PCI. Any of those suffices.
btw., the "I am MRST" bootstrap info is certainly doable via a bootloader flag as well, if this platform is _so_ deprived of basic PC features that it has no other channel of information. Especially if it has no BIOS and if the bootloader provides the memory map as well - which seems to be the case here.
I can understand the PCI ID space being potentially awkward (if many models with mismatching PCI IDs are planned) - so it's certainly possible that the only thing that remains in the end is the bootloader provided flag - no matter how sucky that may be.
So i am not trying to make a bigger deal out of this than it really deserves and this is not a showstopper in my eyes - but this is really an exceptional case and shouldnt be the glory model for how ultra embedded should be done on x86 ...
Ingo
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