Re: Handling of modular boards

From: Ben Dooks
Date: Thu May 10 2012 - 07:14:53 EST

On Fri, May 04, 2012 at 11:09:45PM +0100, Mark Brown wrote:
> On Fri, May 04, 2012 at 10:33:57PM +0200, Wolfgang Denk wrote:
> > On the other hand, some of the issues we're trying to solve here
> > for the kernel are also present in the boot loader, so this needs to
> > do this anyway - whether by inserting new or modifying (enabling or
> > disabling) existing properties in the DT is not really relevant here.
> FWIW if the bootloader can usefully handle this stuff I think that's a
> good approach but there is substantial variation in quality of
> implementation between bootloaders and even when the bootloader is a
> good one it's not always practical to update it or the data it relies
> on.

I agree, the list of devices should be in the device-tree handed to
whatever OS is being booted. It isn't a Linux specific problem that
we're looking at here.

Any operating system, pre-OS test suite, etc. is going going to need
this information, and in my view the bootloader should be doing whatever
is needed to create a device-tree to passed through to the next loaded

Also, having the information available to $bootloader means the user
can verify the presence of the peripherals before the OS is loaded.

Ben Dooks, ben@xxxxxxxxx,

Large Hadron Colada: A large Pina Colada that makes the universe disappear.

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