[U-Boot] [PATCH v2 3/3] common: Generic loader for file system

[Chee, Tien Fong]

On Mon, 2018-06-11 at 16:03 +0200, Marek Vasut wrote:
> On 06/11/2018 03:55 PM, Chee, Tien Fong wrote:
> [...]
> > 
> > > 
> > > > 
> > > > > 
> > > > > > 
> > > > > > Linux firmware loading method is different with this
> > > > > > Linux loading firmware with
> > > > > > 1. Firmware search paths - which is hardcoded in root file
> > > > > > system
> > > > > > 2. Built-in firmware - part of kernel binaries
> > > > > > 
> > > > > > This patch loading firmware with
> > > > > > 1. Storage type and partition specified in DTS, but storage
> > > > > > type
> > > > > > can
> > > > > > be overridden dev instance and partition through U-boot
> > > > > > variable
> > > > > > environment.
> > > > > > 
> > > > > > Or:
> > > > > > 
> > > > > > 2. Storage type can be set through dev instance, and
> > > > > > partition
> > > > > > through
> > > > > > U-boot variable environment. No DTS is required.
> > > > > And why can we not do as Linux does ?
> > > > > 
> > > > Because we don't have root file system, but i have mimicked the
> > > > search
> > > > path in our variable environment, but with both storage type
> > > > and
> > > > partition.
> > > OK, so user can configure environment variable to inform U-Boot
> > > where
> > > to
> > > look for firmware, good (although, this probably fails in early
> > > env,
> > > dunno of that's a problem).
> > > 
> > Without DTS, then you need to configure env variable, so that SPL
> > and
> > U-boot only know what storage type and partiton to look for
> > firmware.
> I guess that's fine ?
> 
Yes, it is already supported in this patches.
> > 
> > > 
> > > But why do we need the DT part of things ? I don't think we do
> > > need
> > > it
> > > at all.
> > > 
> > Leverage the flexibility and benefits of the DT such as changing
> > both
> > storage type and partitions without changing the codes. 
> DT is a hardware description. Does this describe hardware ? No
> 
Okay, then i will remove DT part.