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

[Dirk Behme]

On 08.02.2012 00:48, Graeme Russ wrote:
> Hi Wolfgang,
> 
> On Wed, Feb 8, 2012 at 10:36 AM, Wolfgang Denk <wd at denx.de> wrote:
>> 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?
> 
> Agreed - And as I have stated before, this capability will come about as
> a natural side-effect of the boot process unification (see current x86
> repo ready for pull for illustrative example plus the INIT_CALL code I
> am currently working on). So there is no need to look at hackish ways
> to sidestep 'relocation' until then (at which point they won't be
> needed anyway)
> 
>> 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.
> 
> Correct - The 'issue' is the additional in-RAM copy

Yes.

Best regards

Dirk