diff --git a/dsv4/kernels/attention/fmha.py b/dsv4/kernels/attention/fmha.py
index 8a136b6f..d7c04886 100644
--- a/dsv4/kernels/attention/fmha.py
+++ b/dsv4/kernels/attention/fmha.py
@@ -359,8 +359,12 @@ class FmhaKernel:
                             n2 = n // 64
                             pv_coord = ((m, n0), 0, (n1, n2), 0)
                             
-                            # Convert Float32 → BF16 and write to SMEM
-                            p_val_bf16 = tTMEM_LOADrS_frg[k, j].to(self.q_dtype)
+                            # DEBUG: Write simple test pattern (k+j)*0.01
+                            # This helps verify coordinate mapping
+                            # k and j are loop indices (0-31, 0-3)
+                            pattern_val = Float32(k + j) * Float32(0.01)
+                            p_val_bf16 = pattern_val.to(self.q_dtype)
+                            # Original: p_val_bf16 = tTMEM_LOADrS_frg[k, j].to(self.q_dtype)
                             sP[pv_coord] = p_val_bf16
                         
                         row_sum = row_sum + tTMEM_LOADrS_frg[k, j]