[U-Boot] Patch for OLinuXino Lime boards: default DRAM settings

[Josh Marshall]

We have a number of OlinuXino Lime2 boards (both NAND and eMMC versions)
which were experiencing sporadic hangs. After testing with some heavy
benchmarking and help from the Armbian forum, it was pinned down as the
DRAM settings for the board. The default is 480MHz, but this is unstable,
and even the build instructions from the vendor Olimex themselves say to
set the DRAM clock to 384. (See line 96 at:
https://github.com/OLIMEX/OLINUXINO/blob/master/SOFTWARE/A20/A20-build-3.4.103-release-2/BUILD_DESCRIPTION_A20_Olimex_kernel_3.4.103%2B_Jessie_rel_2.txt
)

I’ve attached a patch against master to change this default:

diff --git a/configs/A20-OLinuXino-Lime2_defconfig
b/configs/A20-OLinuXino-Lime2_defconfig
index 54343de..21c792a 100644
--- a/configs/A20-OLinuXino-Lime2_defconfig
+++ b/configs/A20-OLinuXino-Lime2_defconfig
@@ -2,7 +2,7 @@ CONFIG_ARM=y
 CONFIG_ARCH_SUNXI=y
 CONFIG_SPL_I2C_SUPPORT=y
 CONFIG_MACH_SUN7I=y
-CONFIG_DRAM_CLK=480
+CONFIG_DRAM_CLK=384
 CONFIG_MMC0_CD_PIN="PH1"
 CONFIG_USB0_VBUS_PIN="PC17"
 CONFIG_USB0_VBUS_DET="PH5"
diff --git a/configs/A20-OLinuXino-Lime_defconfig
b/configs/A20-OLinuXino-Lime_defconfig
index c4f6e1a..024dc2d 100644
--- a/configs/A20-OLinuXino-Lime_defconfig
+++ b/configs/A20-OLinuXino-Lime_defconfig
@@ -2,7 +2,7 @@ CONFIG_ARM=y
 CONFIG_ARCH_SUNXI=y
 CONFIG_SPL_I2C_SUPPORT=y
 CONFIG_MACH_SUN7I=y
-CONFIG_DRAM_CLK=480
+CONFIG_DRAM_CLK=384
 CONFIG_MMC0_CD_PIN="PH1"
 CONFIG_DEFAULT_DEVICE_TREE="sun7i-a20-olinuxino-lime"
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set