diff --git a/boards/snps/nsim/arc_classic/nsim_nsim_em7d_v22.dts b/boards/snps/nsim/arc_classic/nsim_nsim_em7d_v22.dts
index 4b52355589a..ef9791ff0d7 100644
--- a/boards/snps/nsim/arc_classic/nsim_nsim_em7d_v22.dts
+++ b/boards/snps/nsim/arc_classic/nsim_nsim_em7d_v22.dts
@@ -6,6 +6,9 @@
 
 /dts-v1/;
 
+#define ICCM_SIZE DT_SIZE_K(256)
+#define DCCM_SIZE DT_SIZE_K(128)
+
 #include "nsim_em.dtsi"
 
 / {
diff --git a/boards/snps/nsim/arc_classic/support/mdb_em7d_v22.args b/boards/snps/nsim/arc_classic/support/mdb_em7d_v22.args
index ea1fa9efbfe..e827823df82 100644
--- a/boards/snps/nsim/arc_classic/support/mdb_em7d_v22.args
+++ b/boards/snps/nsim/arc_classic/support/mdb_em7d_v22.args
@@ -38,10 +38,10 @@
 	-dcache_feature=2
 	-icache=16384,32,2,a
 	-icache_feature=2
-	-dccm_size=0x80000
+	-dccm_size=0x20000
 	-dccm_base=0x80000000
 	-dccm_interleave
-	-iccm0_size=0x80000
+	-iccm0_size=0x40000
 	-iccm0_base=0x00000000
 	-Xpct_counters=8
 	-dmac