[U-Boot-Users] Can U-Boot be divided into TWO stages

[Woodruff, Richard]

In another email to me, he indicated this was for an OMAP processor.
Someone I work with already has done this and its working.  Most of the
u-boot code has been removed.  Enough of the structure exists, so it
feels like a u-boot build environment (and more or less looks like one
also).  We don't plan to merge it as it wouldn't make sense.  We will
provide it to people who want it for OMAPs and NAND booting, it is of
coarse GPL.  The when its easily available is probably the only minor
issue.

Regards,

Richard W.

> -----Original Message-----
> From: u-boot-users-admin at lists.sourceforge.net [mailto:u-boot-users-
> admin at lists.sourceforge.net] On Behalf Of Wolfgang Denk
> Sent: Sunday, June 13, 2004 3:37 AM
> To: chaidy at lenovo.com
> Cc: u-boot-users at lists.sourceforge.net
> Subject: Re: [U-Boot-Users] Can U-Boot be divided into TWO stages
> 
> In message <OF7269A263.F3284F70-ON48256EB2.0013759A at legend.com.cn> you
> wrote:
> >
> > As I would not use any NOR Flash on
> > my project, U-Boot and
> > Linux Kernel are both seated on the
> > NAND Flash. The bootrom
> > can boot only a piece of code not
> > more than 16K, so I must
> > cut U-Boot down to 16k or divide it
> > into two stages (like GRUB).
> 
> This is not (easily) possible. The whole design of U-Boot is based on
> the assumption that we can call C code (including the needed  library
> routines)  as  early  after power-on as possible. Even before initia-
> lizing the memory controller we arrange  for  a  serial  console  and
> messages printed to the console. All this does not fit in 16 kB.
> 
> You could use your own botstrap code which  performs  enough  of  the
> necessary  hardware  intiialization, and which then could load a full
> U-Boot image (whih the relkevant initialization parts disabled)  form
> NAND flash - but to do so you would have to implement your own simple
> boot loader.
> 
> It can be done, but it includes a lot of work and I doubt it if makes
> sense.
> 
> U-Boot was not designed for this, and we don't plan to support such a
> configuration.
> 
> Best regards,
> 
> Wolfgang Denk
> 
> --
> Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
> Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
> There is nothing in this world constant but inconstancy.      - Swift
> 
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