[U-Boot] [PATCH v2 08/29] dm: Allow drivers to be marked 'before relocation'

[Marek Vasut]

On Wednesday, July 09, 2014 at 05:37:58 AM, Simon Glass wrote:
> Driver model currently only operates after relocation is complete. In this
> state U-Boot typically has a small amount of memory available. In adding
> support for driver model prior to relocation we must try to use as little
> memory as possible.
> 
> In addition, on some machines the memory has not be inited and/or the CPU
> is not running at full speed or the data cache is off. These can reduce
> execution performance, so the less initialisation that is done before
> relocation the better.
> 
> An immediately-obvious improvement is to only initialise drivers which are
> actually going to be used before relocation. On many boards the only such
> driver is a serial UART, so this provides a very large potential benefit.
> 
> Allow drivers to mark themselves as 'pre-reloc' which means that they will
> be initialised prior to relocation. This can be done either with a driver
> flag or with a 'dm,pre-reloc' device tree property.

I think we should start marking those DT props something like 'u-boot,dm-pre-
reloc' instead . The same way as Linux marks it's own linux-specific DT props.
[...]
Best regards,
Marek Vasut