perf: reclaim NanoKVM cvifb memory

* board: reclaim NanoKVM cvifb memory

build/boards/sg200x/sg2002_licheervnano_sd/dts_riscv/sg2002_licheervnano_sd.dts

@@ -173,6 +173,7 @@
         /delete-property/ mute-gpio-r;
 };
 
+#if (CVIMMAP_FRAMEBUFFER_SIZE > 0)
 &fb_reserved {
         status = "okay";
 };
@@ -180,6 +181,7 @@
 &cvi_fb {
         status = "okay";
 };
+#endif
 
 &mipi_rx {
         snsr-reset = <&porte 1 GPIO_ACTIVE_LOW>;

build/boards/sg200x/sg2002_licheervnano_sd/memmap.py

@@ -56,9 +56,9 @@ class MemoryMap:
 
     assert ISP_MEM_BASE_ADDR + ISP_MEM_BASE_SIZE <= ION_ADDR + ION_SIZE
 
-    # Boot logo is after the ION buffer
-    # Framebuffer uses boot logo's reserved memory
-    BOOTLOGO_SIZE = 8000 * SIZE_1K
+    # NanoKVM has no display output, so do not reserve framebuffer/bootlogo
+    # memory.  Keeping this at zero returns the region to Linux.
+    BOOTLOGO_SIZE = 0
     BOOTLOGO_ADDR = ION_ADDR - BOOTLOGO_SIZE
     FRAMEBUFFER_SIZE = BOOTLOGO_SIZE
     FRAMEBUFFER_ADDR = BOOTLOGO_ADDR

build/envsetup_soc.sh

@@ -735,6 +735,11 @@ function cvi_setup_env()
 
   PROJECT_FULLNAME="$CHIP"_"$BOARD"
 
+  # NanoKVM has no display output; do not build or load the vendor bootlogo.
+  if [[ "$PROJECT_FULLNAME" == "sg2002_licheervnano_sd" ]]; then
+    ENABLE_BOOTLOGO=0
+  fi
+
   # output folder path
   INSTALL_PATH="$TOP_DIR"/install
   OUTPUT_DIR="$INSTALL_PATH"/soc_"$PROJECT_FULLNAME"