[U-Boot] [PATCH] arm: Add option to disable code relocation

[Wolfgang Denk]

Dear Graeme Russ,

In message <CALButCKfG+guStJP+M5E=NSr34VPhzgbREbxQuXD6028sw6x6A at mail.gmail.com> you wrote:
> 
> > If SPL was to determing the relocation address, it would also have to
> > read the environment, because there are a number of environment
> > variables which can cause (dynamically) the relocation address to
> > change.
> 
> But this is not neccessarily the case for every board (or even every arch)

Not neccessarily, but possible.

> For those boards/arches which CAN calculate the relocation address (either
> because it is fixed do to npn-variable RAM size, or fixed in relation to
> the maximum RAM address) why should we prohibit a method of skipping the
> redundant copy operation in a way which is 100% transparent to everyone
> else?

Can we please focus on unifying the boot process first, before we try
to come up with micro-optimizations?

Most of the people who complain here that they need to skip
relocation are probably wrong in at least two accounts:

- They are not actually talking about relocation at all.
- They don't base their accessment on any real, measured timings, or
  otherwise they would start optimizing completely different areas of
  the code.

Best regards,

Wolfgang Denk

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