Newbie question

[Masahiro Yamada]

Hi Sascha,



On Wed, 1 Oct 2014 14:06:43 +0200
Sascha Hauer <s.hauer at pengutronix.de> wrote:

> Hi,
> 
> On Wed, Oct 01, 2014 at 07:35:34PM +0900, Masahiro Yamada wrote:
> > Hi.
> > 
> > 
> > Please forgive me if I am asking a silly newbie question.
> > 
> > I have some knowledge of U-Boot
> > but I have just started digging into barebox.
> > 
> > 
> > My simple question is, something like SPL
> > (secondary program loader) in U-boot is covered by barebox?
> 
> Yes, it is, in barebox it's called PBL (PreBootLoader).
> 
> If enabled the ROM will load the PBL from the boot device (Or sometimes
> the whole image, depends on the ROM). The PBL will then load the rest
> of the image from the device, uncompress it and jump to it.
> 
> > [1] BootROM (hard-wired)
> > 
> > [2] Tiny boot program
> >     for initializing SDRAM, etc.
> > 
> > [3] High-level boot loader
> >     for loading the kernel, handling device tree etc.
> > 
> > [4] Linux
> > 
> > 
> > 
> > I guess [3] is covered by barebox.
> > 
> > Is [2] supported by barebox? Or is it like Do-It-Yourself thing?
> 
> Well, there's infrastructure for it, but due to the limited space
> and restricted environment in the PBL there's still some DIY left ;)
> 



Now I understood how it works.

 obj-y  => Main barebox
 pbl-y  => PBL


Thanks!



Best Regards
Masahiro Yamada