> >>>why? > >>>and NACK the start.S MUST be generic > >>>I'll rework the RM9200 code for this too > >>start.S is not generic already. > >but it must not become more board specific with ifdef > > what could you suggest instead this? in your case the prelooder > > > > >>and answer is: Gemini does NOT execute code from flash after start up. > >>Some hardware copies 2048 bytes of code from flash to internal SRAM memory. > >>After that it starts execute code from SRAM. We must use position > >>independent code before reallocation. But start.S calls some functions, > >>linked below (TEXT_BASE + 0x800) address. > >>This copy loop copies code from 0x0 base address, which in case of > >>Gemini is not Flash, but SRAM. I must add additional offset to copy code > >>from Flash. Flash physical base is 0x30000000. > >>Because of this specific Gemini feature, I must change start.S and > >>create custom linker script. > >>NOTE: this is not Faraday FA526 core specific, this is Gemini SoC > >>specific. Other SoCs with FA526 core may use different boot approach. > >so it will be better to use a PRELOADER such as we do for nand or onenand > >which will boot u-boot > > you suggest to use two separate boot loaders? this is bad idea. it does not > it's not better for users. they will have problems with firmware > upgrade and similar. no > Problem is solved with several code lines in u-boot, and it is working. > Additional package (preloader) increases system complexity and > decreases reliability. > btw, It is not attractive to use u-boot if I need additional loader. please take a look on the nand_spl and onenand_ipl the preloader is part of u-boot source when you build you u-boot it will result to only one binary with first the preloder and then concat u-boot itself we do this for nand and onenand controler which are allow to download in internal SRAM or so a small piece of code as example on samsung soc for onenand only 2KiB of code
and with what you describe it's clearly the same for you here Best Regards, J. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
