From a209df39d200e7f7e7f9f06f9389a683540429b4 Mon Sep 17 00:00:00 2001
From: fengkehan <fengkehan@bosc.ac.cn>
Date: Tue, 4 Nov 2025 14:33:43 +0800
Subject: [PATCH] FPGA: Fix the makefile to adapt to the  fpgadifftop

---
 Makefile | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index ad287646..389c36fe 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,12 @@
 TOP = TopMain
 SIM_TOP = SimTop
+FPGA_DIFF_TOP = FpgaDiffTop
 FPGATOP = Top
-REAL_TOP = $(if $(strip $(subst sim,,$(BOARD))),$(FPGATOP),$(SIM_TOP))
+# REAL_TOP selection:
+# - if BOARD is exactly "fpgadiff" -> use FPGA_DIFF_TOP
+# - else if BOARD starts with "sim" -> use SIM_TOP
+# - otherwise use FPGATOP
+REAL_TOP = $(if $(filter fpgadiff,$(BOARD)),$(FPGA_DIFF_TOP),$(if $(filter sim,$(BOARD)),$(SIM_TOP),$(FPGATOP)))
 
 BUILD_DIR = $(abspath ./build)