[U-Boot] [PATCH 17/18] configs: am65x_evm: Add support for applying overlays

[Andreas Dannenberg <dannenberg@ti.com>]

This will allow for downloading and applying overlays from an MMC/SD
boot media based on the overlay_files ENV variable containing a list
of overlay files.

Signed-off-by: Andreas Dannenberg <dannenberg@ti.com>
---
 configs/am65x_evm_a53_defconfig | 3 ++-
 include/configs/am65x_evm.h     | 9 +++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/configs/am65x_evm_a53_defconfig b/configs/am65x_evm_a53_defconfig
index 12319dcdeb..058b7dbbf7 100644
--- a/configs/am65x_evm_a53_defconfig
+++ b/configs/am65x_evm_a53_defconfig
@@ -16,7 +16,7 @@ CONFIG_DISTRO_DEFAULTS=y
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
 CONFIG_SPL_LOAD_FIT=y
 CONFIG_OF_BOARD_SETUP=y
-CONFIG_BOOTCOMMAND="run findfdt; run envboot; run init_${boot}; run get_kern_${boot}; run get_fdt_${boot}; run run_kern"
+CONFIG_BOOTCOMMAND="run findfdt; run envboot; run init_${boot}; run get_kern_${boot}; run get_fdt_${boot}; run get_overlay_${boot}; run run_kern"
 # CONFIG_DISPLAY_CPUINFO is not set
 CONFIG_SPL_TEXT_BASE=0x80080000
 CONFIG_SPL_SYS_MALLOC_SIMPLE=y
@@ -79,3 +79,4 @@ CONFIG_DM_SERIAL=y
 CONFIG_SOC_TI=y
 CONFIG_SYSRESET=y
 CONFIG_SYSRESET_TI_SCI=y
+CONFIG_OF_LIBFDT_OVERLAY=y
diff --git a/include/configs/am65x_evm.h b/include/configs/am65x_evm.h
index 7e3d6a3b8f..e3dbcce0bf 100644
--- a/include/configs/am65x_evm.h
+++ b/include/configs/am65x_evm.h
@@ -42,6 +42,7 @@
 		"setenv overlay_files ${name_overlays}\0"		\
 	"loadaddr=0x80080000\0"						\
 	"fdtaddr=0x82000000\0"						\
+	"overlayaddr=0x83000000\0"					\
 	"name_kern=Image\0"						\
 	"console=ttyS2,115200n8\0"					\
 	"args_all=setenv optargs earlycon=ns16550a,mmio32,0x02800000\0" \
@@ -56,6 +57,14 @@
 	"rd_spec=-\0"							\
 	"init_mmc=run args_all args_mmc\0"				\
 	"get_fdt_mmc=load mmc ${bootpart} ${fdtaddr} ${bootdir}/${name_fdt}\0" \
+	"get_overlay_mmc="						\
+		"fdt address ${fdtaddr};"				\
+		"fdt resize 0x100000;"					\
+		"for overlay in $overlay_files;"			\
+		"do;"							\
+		"load mmc ${bootpart} ${overlayaddr} ${bootdir}/${overlay};"	\
+		"fdt apply ${overlayaddr};"				\
+		"done;\0"						\
 	"get_kern_mmc=load mmc ${bootpart} ${loadaddr} "		\
 		"${bootdir}/${name_kern}\0"
 
-- 
2.17.1