xilinx: Make Xilinx custom distro boot commands more verbose

Extend description of Xilinx custom boot commands to make clear what runs
and what failed.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/include/configs/xilinx_zynqmp.h b/include/configs/xilinx_zynqmp.h
index 0107383..eddc2b4 100644
--- a/include/configs/xilinx_zynqmp.h
+++ b/include/configs/xilinx_zynqmp.h
@@ -160,7 +160,8 @@
 #define BOOTENV_DEV_QSPI(devtypeu, devtypel, instance) \
 	"bootcmd_" #devtypel #instance "=sf probe " #instance " 0 0 && " \
 		       "sf read $scriptaddr $script_offset_f $script_size_f && " \
-		       "source ${scriptaddr}; echo SCRIPT FAILED: continuing...;\0"
+		       "echo QSPI: Trying to boot script at ${scriptaddr} && " \
+		       "source ${scriptaddr}; echo QSPI: SCRIPT FAILED: continuing...;\0"
 
 #define BOOTENV_DEV_NAME_QSPI(devtypeu, devtypel, instance) \
 	#devtypel #instance " "
@@ -168,7 +169,8 @@
 #define BOOTENV_DEV_NAND(devtypeu, devtypel, instance) \
 	"bootcmd_" #devtypel #instance "= nand info && " \
 		       "nand read $scriptaddr $script_offset_f $script_size_f && " \
-		       "source ${scriptaddr}; echo SCRIPT FAILED: continuing...;\0"
+		       "echo NAND: Trying to boot script at ${scriptaddr} && " \
+		       "source ${scriptaddr}; echo NAND: SCRIPT FAILED: continuing...;\0"
 
 #define BOOTENV_DEV_NAME_NAND(devtypeu, devtypel, instance) \
 	#devtypel #instance " "
@@ -176,7 +178,8 @@
 #define BOOT_TARGET_DEVICES_JTAG(func)	func(JTAG, jtag, na)
 
 #define BOOTENV_DEV_JTAG(devtypeu, devtypel, instance) \
-	"bootcmd_jtag=source $scriptaddr; echo SCRIPT FAILED: continuing...;\0"
+	"bootcmd_jtag=echo JTAG: Trying to boot script at ${scriptaddr} && " \
+		"source ${scriptaddr}; echo JTAG: SCRIPT FAILED: continuing...;\0"
 
 #define BOOTENV_DEV_NAME_JTAG(devtypeu, devtypel, instance) \
 	"jtag "