[U-Boot] [PATCH 2/3] am43xx_evm: add usb host boot support

[Mugunthan V N]

While booting via usb host mode, ROM uses DMA to copy MLO over USB so
ARM internal RAM cannot be used. Adding USB host boot support by
introducing new config target which sets SPL_TEXT_BASE to OCMC ram.

Signed-off-by: Mugunthan V N <mugunthanvnm at ti.com>
---
 configs/am43xx_evm_usbhost_boot_defconfig | 5 +++++
 include/configs/am43xx_evm.h              | 9 +++++++++
 2 files changed, 14 insertions(+)
 create mode 100644 configs/am43xx_evm_usbhost_boot_defconfig

diff --git a/configs/am43xx_evm_usbhost_boot_defconfig b/configs/am43xx_evm_usbhost_boot_defconfig
new file mode 100644
index 0000000..9455707
--- /dev/null
+++ b/configs/am43xx_evm_usbhost_boot_defconfig
@@ -0,0 +1,5 @@
+CONFIG_ARM=y
+CONFIG_TARGET_AM43XX_EVM=y
+CONFIG_SPL=y
+CONFIG_SYS_EXTRA_OPTIONS="SERIAL1,CONS_INDEX=1,NAND,USBHOST_BOOT"
+CONFIG_CMD_NET=y
diff --git a/include/configs/am43xx_evm.h b/include/configs/am43xx_evm.h
index e5b10ad..3bd9abd 100644
--- a/include/configs/am43xx_evm.h
+++ b/include/configs/am43xx_evm.h
@@ -42,7 +42,16 @@
 #define CONFIG_POWER_TPS62362
 
 /* SPL defines. */
+#ifdef CONFIG_USBHOST_BOOT
+/*
+ * For USB host boot, ROM uses DMA for copying MLO from USB storage
+ * and ARM internal ram is not accessible for DMA, so SPL text base
+ * should be in OCMC ram
+ */
+#define CONFIG_SPL_TEXT_BASE		0x40300350
+#else
 #define CONFIG_SPL_TEXT_BASE		0x402F4000
+#endif
 #define CONFIG_SPL_MAX_SIZE		(220 << 10)	/* 220KB */
 #define CONFIG_SYS_SPL_ARGS_ADDR	(CONFIG_SYS_SDRAM_BASE + \
 					 (128 << 20))
-- 
2.4.2.387.gf86f31a