From: Sascha Hauer <s.hauer@pengutronix.de>
To: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: barebox@lists.infradead.org
Subject: Re: Newbie question
Date: Wed, 1 Oct 2014 14:06:43 +0200 [thread overview]
Message-ID: <20141001120643.GH4992@pengutronix.de> (raw)
In-Reply-To: <20141001193534.5A4B.AA925319@jp.panasonic.com>
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 ;)
Sascha
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next prev parent reply other threads:[~2014-10-01 12:10 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-01 10:35 Masahiro Yamada
2014-10-01 12:06 ` Sascha Hauer [this message]
2014-10-02 3:51 ` Masahiro Yamada
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