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The Extensible Firmware Interface vs early LinuxThe Extensible Firmware Interface vs early LinuxPosted Aug 18, 2011 19:36 UTC (Thu) by giraffedata (subscriber, #1954)In reply to: The Extensible Firmware Interface vs early Linux by marcH Parent article: The Extensible Firmware Interface - an introduction I can't tell what point posting the URL listing lots of serial communication protocols is supposed to make. Is this perhaps a response to my saying I don't know of anyone proposing a protocol other than USB for talking to a bootstrap-only device? Has someone proposed some other serial communications protocol for that? Is there one you would recommend?
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The Extensible Firmware Interface vs early Linux Posted Aug 22, 2011 12:41 UTC (Mon) by marcH (subscriber, #57642) [Link]
A significant number of the interfaces in this list are used for booting. If you "simplify" your firmware design by hardcoding to any of these you will make users of the others unhappy.
Granted, you can imagine dream and modular firmware code that can be selectively trimmed down on a per-platform basis. EFI might get there but why would you do this for (expensive) PC motherboards? A development effort to lose some of your customers?!
By the way USB + managed flash is among the most expensive solutions; this matters for low cost embedded systems.
The Extensible Firmware Interface vs early Linux Posted Aug 22, 2011 19:53 UTC (Mon) by giraffedata (subscriber, #1954) [Link] A significant number of the interfaces in this list are used for booting. If you "simplify" your firmware design by hardcoding to any of these you will make users of the others unhappy. I think you're pointing out the dilemma of standardization. You pick one of many paths in order to reap the benefits of uniformity, but at the cost of going down a path that isn't ideal for some, or even all, particular cases. Of course, we standardize all the time and companies that were relying on the protocol that didn't get chosen suck it up and switch.
A development effort to lose some of your customers?! Unless you're talking about losing customers because it costs more, you've misunderstood the proposal, because customers can still use all of those boot protocols -- the ROM loads from the USB device the bootloader that knows how to load Windows from a SATA drive. By the way USB + managed flash is among the most expensive solutions; this matters for low cost embedded systems. I agree my scheme is not appropriate for embedded systems. It would add very little and cost a lot.
The Extensible Firmware Interface vs early Linux Posted Aug 22, 2011 22:35 UTC (Mon) by marcH (subscriber, #57642) [Link]
> I think you're pointing out the dilemma of standardization.
Yes something like that.
> you've misunderstood the proposal, because customers can still use all of those boot protocols -- the ROM loads from the USB device the bootloader that knows how to load Windows from a SATA drive.
I think I understood the proposal; it looks like we have different customers in mind. I am considering the "ROM loads from X" part while you are considering the "bootloader that knows..." part.
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