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