fix a bug in fsdev introduced by #1942

hw/bsp/ch32v20x/boards/ch32v203c_r0_1v0/board.cmake

@@ -10,7 +10,6 @@ set(LD_RAM_SIZE 20K)
 function(update_board TARGET)
   target_compile_definitions(${TARGET} PUBLIC
     SYSCLK_FREQ_144MHz_HSE=144000000
-    CH32_FLASH_ENHANCE_READ_MODE=1
     CFG_EXAMPLE_MSC_DUAL_READONLY
     )
 endfunction()

hw/bsp/ch32v20x/boards/ch32v203g_r0_1v0/board.cmake

@@ -8,7 +8,6 @@ set(LD_RAM_SIZE 10K)
 function(update_board TARGET)
   target_compile_definitions(${TARGET} PUBLIC
     SYSCLK_FREQ_144MHz_HSI=144000000
-    CH32_FLASH_ENHANCE_READ_MODE=1
     CFG_EXAMPLE_MSC_DUAL_READONLY
     )
 endfunction()

hw/bsp/ch32v20x/boards/nanoch32v203/board.cmake

@@ -8,7 +8,6 @@ set(LD_RAM_SIZE 20K)
 function(update_board TARGET)
   target_compile_definitions(${TARGET} PUBLIC
     SYSCLK_FREQ_144MHz_HSE=144000000
-    CH32_FLASH_ENHANCE_READ_MODE=1
     CFG_EXAMPLE_MSC_DUAL_READONLY
     )
 endfunction()

hw/bsp/ch32v20x/family.cmake

@@ -72,6 +72,12 @@ function(add_board_target BOARD_TARGET)
 
   update_board(${BOARD_TARGET})
 
+  if (LD_FLASH_SIZE STREQUAL 224K)
+    target_compile_definitions(${BOARD_TARGET} PUBLIC
+      CH32_FLASH_ENHANCE_READ_MODE=1
+      )
+  endif()
+
   if (CMAKE_C_COMPILER_ID STREQUAL "GNU")
     target_compile_options(${BOARD_TARGET} PUBLIC
       -mcmodel=medany