[U-Boot] Falcon mode boot support

[Tom Rini <trini@ti.com>]

On Mon, Dec 15, 2014 at 09:08:08PM -0000, Andy Pont wrote:
> Hi Tom,
> 
> > So first, take a look at drivers/mtd/spi/spi_spl_load.c as that's what
> > will be doing falcon mode work on your SPI flash.
> > 
> > Second, take a look at board/ti/am335x/README, you're looking for the
> > lines that read like:
> > Using Device Tree in place at 80f80000, end 80f85928
> 
> I have managed to make some progress and I think I have got what I think is
> the right data stored in the flash.  Unfortunately when I try to boot it
> locks up at:
> 
> spl: payload image: Linu load addr: 0x80007fc0 size: 3893360
> Jumping to Linux
> Entering kernel arg pointer: 0x80000100
> 
> I'm guessing the kernel arg pointer value is incorrect either that or it has
> ignored the boot arguments and not picked up the console parameter.
> 
> Could you advise?

How big is the args file?  We default to placing the args at 0x88000000
in ti_am335x_common.h (see CONFIG_SYS_SPL_ARGS_ADDR) to make sure that
we don't have an overlap between the DT and the kernel which is quite
possible with a reasonably sized DT and placing it at 0x80000100.

-- 
Tom
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