board: xilinx: Add support for user configurable boot script offset

Currently "script_offset_f" env variable is hardcoded, this variable
specifies from which offset of the flash boot.scr should be read/write.
As flashes are of different sizes having a fixed offset makes it
difficult to load other images into the flash which may overwrite the
boot script or cannot utilize the full memory. This current fix
creates a new config "CONFIG_BOOT_SCRIPT_OFFSET" which holds the
offset address, overwrites the "script_offset_f" variable.
Also removed existing variable with default values, as the default
values are held by CONFIG_BOOT_SCRIPT_OFFSET

Signed-off-by: T Karthik Reddy <t.karthik.reddy@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

board/xilinx/Kconfig

@@ -47,3 +47,12 @@ config XILINX_OF_BOARD_DTB_ADDR
 	depends on OF_BOARD
 	help
 	  Offset in the memory where the board configuration DTB is placed.
+
+config BOOT_SCRIPT_OFFSET
+	hex "Boot script offset"
+	depends on ARCH_ZYNQ || ARCH_ZYNQMP || ARCH_VERSAL
+	default 0xFC0000 if ARCH_ZYNQ
+	default 0x3E80000 if ARCH_ZYNQMP
+	default 0x7F80000 if ARCH_VERSAL
+	help
+	   Specifies distro boot script offset in NAND/NOR flash.

board/xilinx/versal/board.c

@@ -203,6 +203,8 @@ int board_late_init(void)
 	initrd_hi = round_down(initrd_hi, SZ_16M);
 	env_set_addr("initrd_high", (void *)initrd_hi);
 
+	env_set_hex("script_offset_f", CONFIG_BOOT_SCRIPT_OFFSET);
+
 	return 0;
 }
 

board/xilinx/zynq/board.c

@@ -76,6 +76,8 @@ int board_late_init(void)
 
 	env_set("boot_targets", new_targets);
 
+	env_set_hex("script_offset_f", CONFIG_BOOT_SCRIPT_OFFSET);
+
 	return 0;
 }
 

board/xilinx/zynqmp/zynqmp.c

@@ -667,6 +667,8 @@ int board_late_init(void)
 	initrd_hi = round_down(initrd_hi, SZ_16M);
 	env_set_addr("initrd_high", (void *)initrd_hi);
 
+	env_set_hex("script_offset_f", CONFIG_BOOT_SCRIPT_OFFSET);
+
 	reset_reason();
 
 	return 0;

include/configs/xilinx_versal.h

@@ -92,7 +92,6 @@
 	"kernel_size_r=0x10000000\0" \
 	"scriptaddr=0x20000000\0" \
 	"ramdisk_addr_r=0x02100000\0" \
-	"script_offset_f=0x7F80000\0" \
 	"script_size_f=0x80000\0"
 
 #if defined(CONFIG_MMC_SDHCI_ZYNQ)

include/configs/xilinx_zynqmp.h

@@ -114,7 +114,6 @@
 	"kernel_addr_r=0x18000000\0" \
 	"scriptaddr=0x20000000\0" \
 	"ramdisk_addr_r=0x02100000\0" \
-	"script_offset_f=0x3e80000\0" \
 	"script_size_f=0x80000\0" \
 
 #if defined(CONFIG_MMC_SDHCI_ZYNQ)

include/configs/zynq-common.h

@@ -194,7 +194,6 @@
 	"fdt_high=0x20000000\0"		\
 	"initrd_high=0x20000000\0"	\
 	"scriptaddr=0x20000\0"	\
-	"script_offset_f=0xFC0000\0"	\
 	"script_size_f=0x40000\0"	\
 	"fdt_addr_r=0x1f00000\0"        \
 	"pxefile_addr_r=0x2000000\0"    \