[U-Boot] am33xx:ddr:Fix config_sdram to work for all DDR

[Tom Rini]

On Fri, Mar 08, 2013 at 07:40:58AM -0000, Tom Rini wrote:

> From: Steve Kipisz <s-kipisz2 at ti.com>
>
> The original write to sdram_config is correct for DDR3 but incorrect
> for DDR2 so SPL was hanging. For DDR2, the write to sdram_config
> should be after the writes to ref_ctrl. This was working for DDR3
> because there was a write of 0x2800 to ref_ctrl before a write
> to sdram_config.
>
> Tested on: GP EVM 1.1A (DDR2), GP EVM 1.5A (DDR3),
>            Beaglebone A6 (DDR2), Beagleone Blacd A4A (DDR3)
>
> Signed-off-by: Steve Kipisz <s-kipisz2 at ti.com>

Applied to u-boot-ti/master (and already pulled into u-boot-arm),
thanks!

--
Tom