Hi Aneesh, On Tuesday 17 May 2011 01:45 PM, Wolfgang Denk wrote: > Dear Aneesh V, > > In message<4dd21baa.6000...@ti.com> you wrote: >> >>> What is MLO? >> >> MLO is the name of SPL created for OMAP. ROM code expects a file with >> this name as the first image when it boots from FAT. > > What does MLO mean?
On looking up ROM code spec, this seems to stand for "MMC/SD Loader" > > >>>> +#ifdef CONFIG_PRELOADER >>>> +/* SPL works from internal RAM. gd pointer can be in .data section */ >>>> +#define DECLARE_GLOBAL_DATA_PTR extern gd_t *gd >>>> +#else >>>> #define DECLARE_GLOBAL_DATA_PTR register volatile gd_t *gd asm >>>> ("r8") >>>> +#endif >>> >>> Is this appropriate for all ARM boards (e.g. those currently using >>> nand_spl)? >> >> None of the SPL's other than this one seems to be using global data >> today. If anybody wants to use it this seems to be the logical option >> for me because by definition SPL runs from some kind of RAM so global >> data can be placed in the .data section of SPL. > > But that's not what you are doing. You are not changing the storage > of the global data itself, you are changing the storage of the POINTER > TO the global data - and this makes no sense to me. The pointer can > certainly remain in a register even if the data itself is somewhere > else. Why do we want to waste a register in the entire SPL when global data can be accessed directly from .data section? best regards, Aneesh _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot