diff --git a/env_support/cmsis-pack/LVGL.lvgl.9.4.0.pack b/env_support/cmsis-pack/LVGL.lvgl.9.4.0.pack
index e293b8c2ef..c2efc86ba9 100644
Binary files a/env_support/cmsis-pack/LVGL.lvgl.9.4.0.pack and b/env_support/cmsis-pack/LVGL.lvgl.9.4.0.pack differ
diff --git a/env_support/cmsis-pack/LVGL.lvgl.pdsc b/env_support/cmsis-pack/LVGL.lvgl.pdsc
index 2050640baf..3730475337 100644
--- a/env_support/cmsis-pack/LVGL.lvgl.pdsc
+++ b/env_support/cmsis-pack/LVGL.lvgl.pdsc
@@ -1697,6 +1697,7 @@
                 <file category="sourceC"    name="src/libs/vg_lite_driver/VGLite/vg_lite_stroke.c" />
                 <file category="sourceC"    name="src/libs/vg_lite_driver/VGLiteKernel/vg_lite_kernel.c" />
                 <file category="sourceC"    name="src/libs/vg_lite_driver/lv_vg_lite_hal/lv_vg_lite_hal.c" />
+                <file category="sourceC"    name="src/libs/vg_lite_driver/lv_vg_lite_hal/vg_lite_os.c" />
               </files>
 
               <RTE_Components_h>
diff --git a/env_support/cmsis-pack/lv_conf_cmsis.h b/env_support/cmsis-pack/lv_conf_cmsis.h
index b5ba20952d..8f8123e679 100644
--- a/env_support/cmsis-pack/lv_conf_cmsis.h
+++ b/env_support/cmsis-pack/lv_conf_cmsis.h
@@ -359,7 +359,9 @@
     /* EVE_GEN value: 2, 3, or 4 */
     #define LV_DRAW_EVE_EVE_GENERATION 4
 
-    /* the maximum number of bytes to buffer before a single SPI transmission */
+    /* The maximum number of bytes to buffer before a single SPI transmission.
+     * Set it to 0 to disable write buffering.
+     */
     #define LV_DRAW_EVE_WRITE_BUFFER_SIZE 2048
 #endif