Hello,

When supporting multiple hardware targets, overlay_map.dtb might
be needed to map overlay names to one of several implementations.

Signed-off-by: Rutger Sassen <rsassen@comecer.com>
---
Changes v2 -> v3:
- in Config.in use if statement instead of depends (suggested by Peter
Seiderer)
- mention the filename overlay_map.dtb in the help text (suggested by
Peter Seiderer)

Changes v1 -> v2:
- instead of always copying overlay_map.dtb, make it configurable
(suggested by Peter Seiderer)
- do not copy README since it a special case, only needed when
installing overlays to a non-standard location (suggested by Peter
Seiderer)

When supporting multiple hardware targets, overlay_map.dtb might
be needed to map overlay names to one of several implementations.

Signed-off-by: Rutger Sassen <rsassen@comecer.com>
---
package/rpi-firmware/Config.in | 12 ++++++++++++
package/rpi-firmware/rpi-firmware.mk | 7 +++++++
2 files changed, 19 insertions(+)

diff --git a/package/rpi-firmware/Config.in b/package/rpi-firmware/Config.in
index 8070dc3019..36054353f8 100644
--- a/package/rpi-firmware/Config.in
+++ b/package/rpi-firmware/Config.in
@@ -93,6 +93,18 @@ config BR2_PACKAGE_RPI_FIRMWARE_INSTALL_DTB_OVERLAYS
overlays, to support HATs (Hardware Attached on Top, add-on
modules).

+if BR2_PACKAGE_RPI_FIRMWARE_INSTALL_DTB_OVERLAYS
+
+config BR2_PACKAGE_RPI_FIRMWARE_INSTALL_DTB_OVERLAY_MAP
+ bool "Install DTB overlay map"
+ default n

+ help
+ Say 'y' here if you need to support multiple hardware targets
+ and you need overlay_map.dtb for target dependent mapping of
+ overlay names to one of several overlay implementations.
+
+endif # BR2_PACKAGE_RPI_FIRMWARE_INSTALL_DTB_OVERLAYS
+
config BR2_PACKAGE_RPI_FIRMWARE_INSTALL_VCDBG
bool "vcdbg"
depends on BR2_arm # prebuilt arm binary, rpi-userland
diff --git a/package/rpi-firmware/rpi-firmware.mk b/package/rpi-firmware/rpi-firmware.mk
index b46a7f5270..800b560070 100644
--- a/package/rpi-firmware/rpi-firmware.mk
+++ b/package/rpi-firmware/rpi-firmware.mk
@@ -57,6 +57,12 @@ define RPI_FIRMWARE_INSTALL_DTB_OVERLAYS
endef
endif

+ifeq ($(BR2_PACKAGE_RPI_FIRMWARE_INSTALL_DTB_OVERLAY_MAP),y)
+define RPI_FIRMWARE_INSTALL_DTB_OVERLAY_MAP
+ $(INSTALL) -D -m 0644 $(@D)/boot/overlays/overlay_map.dtb $(BINARIES_DIR)/rpi-firmware/overlays/
+endef
+endif
+
# Install prebuilt libraries if RPI_USERLAND not enabled
ifneq ($(BR2_PACKAGE_RPI_USERLAND),y)
define RPI_FIRMWARE_INSTALL_TARGET_LIB
@@ -83,6 +89,7 @@ define RPI_FIRMWARE_INSTALL_IMAGES_CMDS
$(RPI_FIRMWARE_INSTALL_CONFIG)
$(RPI_FIRMWARE_INSTALL_DTB)
$(RPI_FIRMWARE_INSTALL_DTB_OVERLAYS)
+ $(RPI_FIRMWARE_INSTALL_DTB_OVERLAY_MAP)
endef

$(eval $(generic-package))
--
2.20.1

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