sama7d65: Add eth_phy overlay support

Adding support for using the eth_phy uboot variable to include the
appropriate gmac overlay.

Also including gmac0 as the primary ethernet interface for uboot and
creating the loadaddr variable so that the iminfo command knows the
default address when no address is specified.

Signed-off-by: Jerry Ray <[email protected]>
Reviewed-by: Nayab Sayed <[email protected]>
Signed-off-by: Conor Dooley <[email protected]>

Author: Jerry0443

board/microchip/sama7d65_curiosity/uboot-env.txt

@@ -3,16 +3,18 @@ board_name=sama7d65_curiosity
 video_mode_mipi=Unknown-1:720x1280-16
 video_mode_lvds=Unknown-1:800x480-16
 eth_phy=lan8840
-at91_display_detect=run lvdstest; run mipitest; run at91_prepare_bootargs; run at91_prepare_display_overlay
+at91_display_detect=run lvdstest; run mipitest; run at91_prepare_bootargs; run at91_prepare_display_overlay; run at91_prepare_eth_overlay
 lvdstest=test -n $display && test $display = ST7262 && setenv display_var 'lvds' && setenv at91_video_bootargs video=${video_mode_lvds}
 mipitest=test -n $display && test $display = HX8394 && setenv display_var 'mipi' && setenv at91_video_bootargs video=${video_mode_mipi}
 at91_prepare_bootargs=test -n $at91_video_bootargs && setenv bootargs ${bootargs} ${at91_video_bootargs}
 at91_prepare_display_overlay=test -n $display_var && setenv at91_overlays_config ${at91_overlays_config}'#'${display_var}
+at91_prepare_eth_overlay=test -n $eth_phy && setenv at91_overlays_config ${at91_overlays_config}'#'${eth_phy}
 bootargs=console=ttyS0,115200 root=/dev/mmcblk0p2 rw rootfstype=ext4 rootwait atmel.pm_modes=standby,ulp0 cma=192m
 bootcmd=run at91_display_detect; run bootcmd_boot;
-bootcmd_boot=fatload mmc 0:1 0x63000000 sama7d65_curiosity.itb; bootm 0x63000000#kernel_dtb${at91_overlays_config}
+bootcmd_boot=fatload mmc 0:1 ${loadaddr} sama7d65_curiosity.itb; bootm ${loadaddr}#kernel_dtb${at91_overlays_config}
 bootdelay=1
-ethact=gmac0
+ethprime=gmac0
+loadaddr=0x63000000
 stderr=serial
 stdin=serial
 stdout=serial