[U-Boot] [PATCH V3 2/3] arm/davinci: spl - boot device selection

[Sughosh Ganu <urwithsughosh@gmail.com>]

On Wed Jul 11, 2012 at 01:19:40AM -0700, Tom Rini wrote:
> On 07/10/2012 11:38 PM, Sughosh Ganu wrote:
> > On Tue Jul 10, 2012 at 11:20:53PM +0400, Mikhail Kshevetskiy wrote:
> >> On Wed, 11 Jul 2012 00:09:06 +0530
> >> Sughosh Ganu <urwithsughosh@gmail.com> wrote:
> >>>> diff --git a/arch/arm/cpu/arm926ejs/davinci/spl.c
> >>>> b/arch/arm/cpu/arm926ejs/davinci/spl.c index 74632e5..50b4bbc 100644
> >>>> --- a/arch/arm/cpu/arm926ejs/davinci/spl.c
> >>>> +++ b/arch/arm/cpu/arm926ejs/davinci/spl.c
> >>>
> >>> <snip>
> >>>
> >>>>  void board_init_r(gd_t *id, ulong dummy)
> >>>>  {
> >>>> -#ifdef CONFIG_SPL_NAND_LOAD
> >>>> -	nand_init();
> >>>> -	puts("Nand boot...\n");
> >>>> -	nand_boot();
> >>>> -#endif
> >>>> -#ifdef CONFIG_SPL_SPI_LOAD
> >>>> -	mem_malloc_init(CONFIG_SYS_TEXT_BASE - CONFIG_SYS_MALLOC_LEN,
> >>>> -			CONFIG_SYS_MALLOC_LEN);
> >>>> +	u32 boot_device;
> >>>> +	void (*uboot)(void) __noreturn;
> >>>> +
> >>>> +	mem_malloc_init(CONFIG_SYS_SPL_MALLOC_START,
> >>>> +			CONFIG_SYS_SPL_MALLOC_SIZE);
> >>>
> >>> We do not need any heap for the spl on the hawkboard, so can you
> >>> please explain why do we need the heap allocation for all spl
> >>> images. Can't this be made configurable.
> >>
> >> this is needed at least for:
> >>   * MMC support
> >>   * SPI support
> >>   * gunzip support (see next patch)
> >>
> >> it can be configurable, but is it reasonable?
> > 
> > I would think so -- i guess it should be fine to include this only for
> > boards/configurations that actually need the heap.
> 
> Shouldn't "load u-boot.img from vfat SD card" be a common case at least
> for developers?

Yes, it should be, but what i meant was that things that are not
needed for certain boards or configurations need not be made
common. Like in this case, why does setting up a heap, which is not
needed at least on my board need to be common for all spl images. If a
particular board/configuration needs it, then use it.

Loading an image from a media is a common case, but for that
particular media only. Other media might have different requirements.

-sughosh