board: ti: am64x: Set fdtfile from C code instead of findfdt script

We now can provide a map and have the standard fdtfile variable set from
code itself. This allows for bootstd to "just work".

While at this, replace findfdt in environment with a warning as it is no
longer needed.

Reviewed-by: Jonathan Humphreys <j-humphreys@ti.com>
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Signed-off-by: Nishanth Menon <nm@ti.com>

board/ti/am64x/am64x.env

@@ -2,14 +2,6 @@
 #include <env/ti/mmc.env>
 #include <env/ti/k3_dfu.env>
 
-findfdt=
-	if test $board_name = am64x_gpevm; then
-		setenv name_fdt ti/k3-am642-evm.dtb; fi;
-	if test $board_name = am64x_skevm; then
-		setenv name_fdt ti/k3-am642-sk.dtb; fi;
-	if test $name_fdt = undefined; then
-		echo WARNING: Could not determine device tree to use; fi;
-	setenv fdtfile ${name_fdt}
 name_kern=Image
 console=ttyS2,115200n8
 args_all=setenv optargs earlycon=ns16550a,mmio32,0x02800000 ${mtdparts}
@@ -43,7 +35,6 @@ get_fit_usb=load usb ${bootpart} ${addr_fit}
 usbboot=setenv boot usb;
 	setenv bootpart 0:2;
 	usb start;
-	run findfdt;
 	run init_usb;
 	run get_kern_usb;
 	run get_fdt_usb;

board/ti/am64x/evm.c

@@ -16,6 +16,7 @@
 #include <env.h>
 
 #include "../common/board_detect.h"
+#include "../common/fdt_ops.h"
 
 #define board_is_am64x_gpevm() (board_ti_k3_is("AM64-GPEVM") || \
 				board_ti_k3_is("AM64-EVM") || \
@@ -181,6 +182,12 @@ int checkboard(void)
 }
 
 #ifdef CONFIG_BOARD_LATE_INIT
+static struct ti_fdt_map ti_am64_evm_fdt_map[] = {
+	{"am64x_gpevm", "k3-am642-evm.dtb"},
+	{"am64x_skevm", "k3-am642-sk.dtb"},
+	{ /* Sentinel. */ }
+};
+
 static void setup_board_eeprom_env(void)
 {
 	char *name = "am64x_gpevm";
@@ -198,6 +205,7 @@ static void setup_board_eeprom_env(void)
 
 invalid_eeprom:
 	set_board_info_env_am6(name);
+	ti_set_fdt_env(name, ti_am64_evm_fdt_map);
 }
 
 static void setup_serial(void)