[U-Boot] Reading data from SPI flash before relocation - what is the best way to do this?

[Krzeminski, Marcin (Nokia - PL/Wroclaw)]

> -----Original Message-----
> From: EXT Wolfgang Denk [mailto:wd at denx.de]
> Sent: Thursday, October 22, 2015 7:16 PM
> To: Krzeminski, Marcin (Nokia - PL/Wroclaw)
> <marcin.krzeminski at nokia.com>
> Cc: u-boot at lists.denx.de
> Subject: Re: [U-Boot] Reading data from SPI flash before relocation - what is
> the best way to do this?
> 
> Dear Marcin,
> 
> In message
> <CA0E6F9BA6AED7458C23277BD87075E50F731841 at DEMUMBX014.nsn-
> intra.net> you wrote:
> >
> > I want to chose the best aproach to achive something like this:
> > There is a u-boot without SPL and it is copied by bootrom to SDRAM.
> 
> OK, the question why you don't use SPL has already been asked.
> 
> > In first phase (while running  *_f functions) I need to read some
> configuration data from SPI NOR, and it must be done before DDR config.
> 
> Why do you need to read it separately?  Can you not "attach" it to the
> U-Boot image, so the boot ROM will read that combined image (U-Boot
> plus your config data) ?
> 

Because many configuration are expected, so avoiding many u-boot binaries is the target.

Generally it seems that I want to do something that is against u-boot design, so my question should be,
how to do it harmless?

I changed linker script, cleared bss and it seem that this is working fine, so probably I'll try this way.

> 
> Best regards,
> 
> Wolfgang Denk
> 
> --
> DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
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Best regards,
Marcin Krzemiński