boot/xilinx-prebuilt: add segmented config support

AMD has created a new segmented configuration for Versal products.  It splits
the Vivado hardware design into two PDI files, one containing the minimal
required configuration for the DDR and booting the processors, and a second PDI
file which contains the rest of the FPGA design and can be loaded at run-time
via U-boot or Linux.

The file names generated when using the Vivado Segmented Configuration are as
follows:

<design>_boot.pdi - Minimal DDR and PS config for booting
<design>_pld.pdi - Remainder of FPGA design to be loaded at run-time

Since two PDI files will be included in the XSA file when using Segmented
Configuration, the xilinx-prebuilt package needs to be updated to support
this feature.

For Buildroot purposes, the <design>_boot.pdi is the file that needs to be
included in the boot.bin for booting the processors, so this patch checks
for a file named *boot*.pdi which will indicate that Segmented Configuration
is being used and will make sure to use the <design>_boot.pdi file and not
the <design>_pld.pdi file when generating the boot.bin image.

If no pdi files contain the word "boot" in the filename, it can be assumed
that Segmented Configuration is not being used, so the single file *.pdi
method is the appropriate one for this case, and this patch is thus
backwards compatible with prior designs not using Segmented Configuration.

Also, Segmented Configuration is going to become the default mode for Versal
products, so the xilinx-prebuilt github location will also soon have two PDI
files for each board.  For this reason, this patch is also handling Segmented
Configuration for files downloaded from the xilinx-prebuilt repo.

For further information about the AMD Segmented Configuration, please see the
github tutorial below.

https://github.com/Xilinx/Vivado-Design-Tutorials/tree/2024.2/Versal/Boot_and_Config/Segmented_Configuration

Signed-off-by: Neal Frager <neal.frager@amd.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

boot/xilinx-prebuilt/xilinx-prebuilt.mk

@@ -28,9 +28,6 @@ XILINX_PREBUILT_BOARD = $(call qstrip,$(BR2_TARGET_XILINX_PREBUILT_BOARD))
 XILINX_PREBUILT_BOARD_DIR = $(@D)/$(XILINX_PREBUILT_BOARD)-$(XILINX_PREBUILT_FAMILY)
 
 ifeq ($(BR2_TARGET_XILINX_PREBUILT_VERSAL),y)
-# We need the *.pdi glob, because the file has different names for the
-# different boards, but there is only one, and it has to be named
-# vpl_gen_fixed.pdi when installed.
 ifeq ($(BR2_TARGET_XILINX_PREBUILT_VERSAL_XSA),y)
 XILINX_PREBUILT_PLM = $(@D)/pdi_files/gen_files/plm.elf
 # Unlike the psmfw.elf file for Xilinx development boards,
@@ -39,11 +36,33 @@ XILINX_PREBUILT_PLM = $(@D)/pdi_files/gen_files/plm.elf
 # so to support current and future AMD Vivado versions, the filename
 # psm*fw.elf is used.
 XILINX_PREBUILT_PSMFW = $(@D)/pdi_files/static_files/psm*fw.elf
-XILINX_PREBUILT_PDI = $(@D)/*.pdi
+# We need the *.pdi glob, because the file has different names for the
+# different boards, and it has to be named vpl_gen_fixed.pdi when installed.
+# If Segmented Configuration is used, there will be two pdi files and we need
+# the file that has "_boot.pdi" in the filename.
+define XILINX_PREBUILT_INSTALL_VERSAL_XSA_BOOT_PDI
+	$(INSTALL) -D -m 0644 \
+		$(if $(wildcard $(@D)/*_boot.pdi), \
+			$(@D)/*_boot.pdi, \
+			$(@D)/*.pdi \
+		) \
+		$(BINARIES_DIR)/vpl_gen_fixed.pdi
+endef
 else # BR2_TARGET_XILINX_PREBUILT_VERSAL_XSA
 XILINX_PREBUILT_PLM = $(XILINX_PREBUILT_BOARD_DIR)/plm.elf
 XILINX_PREBUILT_PSMFW = $(XILINX_PREBUILT_BOARD_DIR)/psmfw.elf
-XILINX_PREBUILT_PDI = $(XILINX_PREBUILT_BOARD_DIR)/*.pdi
+# We need the *.pdi glob, because the file has different names for the
+# different boards, and it has to be named vpl_gen_fixed.pdi when installed.
+# If Segmented Configuration is used, there will be two pdi files and we need
+# the file that has "_boot.pdi" in the filename.
+define XILINX_PREBUILT_INSTALL_VERSAL_BOOT_PDI
+	$(INSTALL) -D -m 0644 \
+		$(if $(wildcard $(XILINX_PREBUILT_BOARD_DIR)/*_boot.pdi), \
+			$(XILINX_PREBUILT_BOARD_DIR)/*_boot.pdi, \
+			$(XILINX_PREBUILT_BOARD_DIR)/*.pdi \
+		) \
+		$(BINARIES_DIR)/vpl_gen_fixed.pdi
+endef
 endif # BR2_TARGET_XILINX_PREBUILT_VERSAL_XSA
 
 ifneq ($(BR2_TARGET_XILINX_EMBEDDEDSW_VERSAL_PLM),y)
@@ -60,10 +79,6 @@ define XILINX_PREBUILT_INSTALL_VERSAL_PSMFW
 endef
 endif # !BR2_TARGET_XILINX_EMBEDDEDSW_VERSAL_PSMFW
 
-define XILINX_PREBUILT_INSTALL_VERSAL_PDI
-	$(INSTALL) -D -m 0644 $(XILINX_PREBUILT_PDI) \
-		$(BINARIES_DIR)/vpl_gen_fixed.pdi
-endef
 else # BR2_TARGET_XILINX_PREBUILT_VERSAL
 ifneq ($(BR2_TARGET_XILINX_EMBEDDEDSW_ZYNQMP_PMUFW),y)
 define XILINX_PREBUILT_INSTALL_ZYNQMP_PMUFW
@@ -76,7 +91,8 @@ endif # BR2_TARGET_XILINX_PREBUILT_VERSAL
 define XILINX_PREBUILT_INSTALL_IMAGES_CMDS
 	$(XILINX_PREBUILT_INSTALL_VERSAL_PLM)
 	$(XILINX_PREBUILT_INSTALL_VERSAL_PSMFW)
-	$(XILINX_PREBUILT_INSTALL_VERSAL_PDI)
+	$(XILINX_PREBUILT_INSTALL_VERSAL_BOOT_PDI)
+	$(XILINX_PREBUILT_INSTALL_VERSAL_XSA_BOOT_PDI)
 	$(XILINX_PREBUILT_INSTALL_ZYNQMP_PMUFW)
 endef