[U-Boot-Users] Increasing U-Boot partition size

Wolfgang Denk wd at denx.de
Mon Aug 4 22:33:11 CEST 2008


In message <489765FB.1010002 at ge.com> you wrote:
>
> > Your choices are 0xfff00000 and zero, based on the BMS (Boot Memory 
> > Space) bit of the low reset control word.
> > 
> > -Scott
> 
> ...and of the two options, I recommend 0xfff00000 ("boot high").  Note 
> that the start of u-boot is 0xfff00000 but the reset vector itself is 
> 0xfff00100 (or 0x00000100 for "boot low").  The first 0x100 bytes has 
> the u-boot signature and version info.

I disagree.

High-booting systems are a PITA. You always lose a full  megabyte  at
the  end of the flash of which usually only 256 kB or less are needed
for U-Boot, wasting 0.75 MB.

Also, systems with varying number of flash banks and/or flash sizes
are not really straightforward to handle.

Low-booting is much, much saner.

Best regards,

Wolfgang Denk

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