diff --git a/sdk/CMakeLists.txt b/sdk/CMakeLists.txt
index 69400fd89..9b6b30ee0 100644
--- a/sdk/CMakeLists.txt
+++ b/sdk/CMakeLists.txt
@@ -150,6 +150,12 @@ enable_testing()
 #   per-model (llama-hexagon-power-mode.patch alone only reads it once, from
 #   GGML_HEXAGON_POWER_MODE, at backend-registry construction). See
 #   sdk/plugins/llama_cpp/src/htp_session.cpp for the caller.
+# * llama-hexagon-hmx-f16-batched-prefetch.patch fixes the prefetch source of
+#   the second weight chunk in the batched F16 HMX matmul (GQA broadcast). It
+#   read one row past the first chunk, so the second chunk's output was wrong
+#   whenever the weights span more than one chunk (attention prefill without
+#   flash attention at long KV). Upstream ggml-org/llama.cpp#29626 carries the
+#   same fix; delete this file once the submodule is bumped past it.
 # * llama-opencl-adreno-cpy-constreg.patch works around an Adreno OpenCL
 #   compiler crash: kernel_cpy_f32_f32_pack's min(ne00, get_local_size(0))
 #   emits an IMINrr with two constant-class operands, which the driver's
@@ -175,7 +181,8 @@ if(GENIEX_PLUGIN_LLAMA_CPP)
         list(APPEND _LLAMA_PATCHES
             "${CMAKE_CURRENT_SOURCE_DIR}/patches/llama-hexagon-release-sessions.patch"
             "${CMAKE_CURRENT_SOURCE_DIR}/patches/llama-hexagon-power-mode.patch"
-            "${CMAKE_CURRENT_SOURCE_DIR}/patches/llama-hexagon-power-mode-setter.patch")
+            "${CMAKE_CURRENT_SOURCE_DIR}/patches/llama-hexagon-power-mode-setter.patch"
+            "${CMAKE_CURRENT_SOURCE_DIR}/patches/llama-hexagon-hmx-f16-batched-prefetch.patch")
     endif()
     if(GGML_OPENCL)
         list(APPEND _LLAMA_PATCHES
diff --git a/sdk/patches/llama-hexagon-hmx-f16-batched-prefetch.patch b/sdk/patches/llama-hexagon-hmx-f16-batched-prefetch.patch
new file mode 100644
index 000000000..ff831ae06
--- /dev/null
+++ b/sdk/patches/llama-hexagon-hmx-f16-batched-prefetch.patch
@@ -0,0 +1,13 @@
+diff --git a/ggml/src/ggml-hexagon/htp/matmul-ops.c b/ggml/src/ggml-hexagon/htp/matmul-ops.c
+index a09bc7a28..526f200b0 100644
+--- a/ggml/src/ggml-hexagon/htp/matmul-ops.c
++++ b/ggml/src/ggml-hexagon/htp/matmul-ops.c
+@@ -3356,7 +3356,7 @@ static int hmx_mm_f16_f32_batched(struct htp_context *ctx, const hmx_mm_f16_f32_
+                 }
+                 if (n_chunk_n_cols < (size_t) params->n) {
+                     const size_t n_cols_second = hex_smin((size_t) params->n - n_chunk_n_cols, n_chunk_n_cols);
+-                    dma_queue_push(weight_dma, dma_make_data(vtcm_scratch1, weight_group + params->weight_stride * sizeof(__fp16)),
++                    dma_queue_push(weight_dma, dma_make_data(vtcm_scratch1, weight_group + n_chunk_n_cols * params->weight_stride * sizeof(__fp16)),
+                                       fp16_row_bytes, weight_row_bytes, fp16_row_bytes, n_cols_second);
+                 }
+