[U-Boot] [PATCH v2 4/8] nios2: enlarge the code relocation range

[Marek Vasut]

On Sunday, September 06, 2015 at 01:28:08 PM, Thomas Chou wrote:
> HI Marek,

Hi!

> On 09/05/2015 08:50 PM, Marek Vasut wrote:
> >> We didn't include relocation records in nios2 binary image, so there is
> >> no real relocation like that of ARM.
> > 
> > Can we add them instead ?
> 
> I think it is possible. I recalled that we have an old flat image format
> with elf2flt to run nonmmu uclinux, which does a similar relocation. But
> I would suggest that we should keep thing simple and small in a boot
> loader like U-Boot.

We already do it on ARM though and the reason for this is to place U-Boot
at the end of the DRAM, so that most of the DRAM can be used by the user.

> >> Altera provides small boot loaders for cfi/sf along with their nios2
> >> jtag flash programmer, which will load the image to the linked address
> >> in sdram. The relocating loop in start.S works only if such Altera boot
> >> loader is not used, ie, booting directly from cfi flash.
> > 
> > Hm, Im not using the Altera loader :)
> 
> Neither am I. Look like we all use custom boot copiers, and we don't
> need the relocation in the patch above. It doesn't make sense to copy
> the code twice. Right? :)

In fact, I am loading U-Boot with GDB thus far, so I am only copying it
once ;-) Where is the second copying coming from ?

Best regards,
Marek Vasut