[LPC11U24] Take advantage of the full 8K of RAM

The linker command scripts/startup files used only 4K of RAM on this target.

Author: Bogdan Marinescu

libraries/mbed/targets/cmsis/TARGET_NXP/TARGET_LPC11UXX/TOOLCHAIN_ARM_MICRO/LPC11U24.sct

@@ -6,9 +6,12 @@ LR_IROM1 0x00000000 0x8000  {    ; load region size_region (32k)
    .ANY (+RO)
   }
   ; 8_byte_aligned(48 vect * 4 bytes) =  8_byte_aligned(0xC0) = 0xC0
-  ; 8KB - 0xC0 = 0xF40
-  RW_IRAM1 0x100000C0 0xF40  {
+  ; 8KB - 0xC0 = 0x1F40
+  RW_IRAM1 0x100000C0 0x1F40  {
    .ANY (+RW +ZI)
   }
+  RW_IRAM2 0x20004000 0x800   { ; RW data, USB RAM
+   .ANY (USBRAM)
+  }
 }
 

libraries/mbed/targets/cmsis/TARGET_NXP/TARGET_LPC11UXX/TOOLCHAIN_ARM_MICRO/startup_LPC11xx.s

@@ -25,7 +25,7 @@ Stack_Size      EQU     0x00000400
                 EXPORT  __initial_sp
 
 Stack_Mem       SPACE   Stack_Size
-__initial_sp        EQU     0x10001000  ; Top of RAM from LPC11U
+__initial_sp        EQU     0x10002000  ; Top of RAM from LPC11U
 
 
 Heap_Size       EQU     0x00000000

libraries/mbed/targets/cmsis/TARGET_NXP/TARGET_LPC11UXX/TOOLCHAIN_ARM_STD/LPC11U24.sct

@@ -6,9 +6,12 @@ LR_IROM1 0x00000000 0x8000  {    ; load region size_region (32k)
    .ANY (+RO)
   }
   ; 8_byte_aligned(48 vect * 4 bytes) =  8_byte_aligned(0xC0) = 0xC0
-  ; 8KB - 0xC0 = 0xF40
-  RW_IRAM1 0x100000C0 0xF40  {
+  ; 8KB - 0xC0 = 0x1F40
+  RW_IRAM1 0x100000C0 0x1F40  {
    .ANY (+RW +ZI)
   }
+  RW_IRAM2 0x20004000 0x800   { ; RW data, USB RAM
+   .ANY (USBRAM)
+  }
 }
 

libraries/mbed/targets/cmsis/TARGET_NXP/TARGET_LPC11UXX/TOOLCHAIN_ARM_STD/startup_LPC11xx.s

@@ -19,7 +19,7 @@
 ; *
 ; *****************************************************************************/
 
-__initial_sp        EQU     0x10001000  ; Top of RAM from LPC11U
+__initial_sp        EQU     0x10002000  ; Top of RAM from LPC11U
 
                 PRESERVE8
                 THUMB

libraries/mbed/targets/cmsis/TARGET_NXP/TARGET_LPC11UXX/TOOLCHAIN_GCC_ARM/LPC11U24.ld

@@ -4,7 +4,8 @@
 MEMORY
 {
   FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 32K
-  RAM (rwx) : ORIGIN = 0x100000C0, LENGTH = 0xF40
+  RAM (rwx) : ORIGIN = 0x100000C0, LENGTH = 0x1F40
+  USB_RAM (rwx): ORIGIN = 0x20004000, LENGTH = 0x800
 }
 
 /* Linker script to place sections and symbol values. Should be used together

libraries/mbed/targets/cmsis/TARGET_NXP/TARGET_LPC11UXX/TOOLCHAIN_GCC_CR/LPC11U24.ld

@@ -7,12 +7,12 @@ MEMORY
 {
   /* Define each memory region */
   MFlash32 (rx) : ORIGIN = 0x0, LENGTH = 0x8000 /* 32k */
-  RamLoc4 (rwx) : ORIGIN = 0x100000C0, LENGTH = 0xF40 /* 4k */
+  RamLoc8 (rwx) : ORIGIN = 0x100000C0, LENGTH = 0x1F40 /* 8k */
   RamUsb2 (rwx) : ORIGIN = 0x20004000, LENGTH = 0x800 /* 2k */
 }
   /* Define a symbol for the top of each memory region */
   __top_MFlash32 = 0x0 + 0x8000;
-  __top_RamLoc4 = 0x10000000 + 0x1000;
+  __top_RamLoc8 = 0x10000000 + 0x2000;
   __top_RamUsb2 = 0x20004000 + 0x800;
 
 ENTRY(ResetISR)
@@ -116,7 +116,7 @@ SECTIONS
     .uninit_RESERVED : ALIGN(4)
     {
         KEEP(*(.bss.$RESERVED*))
-    } > RamLoc4
+    } > RamLoc8
 
     .data : ALIGN(4)
     {
@@ -126,7 +126,7 @@ SECTIONS
         *(.data*)
         . = ALIGN(4) ;
         _edata = .;
-    } > RamLoc4 AT>MFlash32
+    } > RamLoc8 AT>MFlash32
 
 
     .bss_RAM2 : ALIGN(4)
@@ -145,8 +145,8 @@ SECTIONS
         . = ALIGN(4) ;
         _ebss = .;
         PROVIDE(end = .);
-    } > RamLoc4
+    } > RamLoc8
 
     PROVIDE(_pvHeapStart = .);
-    PROVIDE(_vStackTop = __top_RamLoc4 - 0);
+    PROVIDE(_vStackTop = __top_RamLoc8 - 0);
 }

libraries/mbed/targets/cmsis/TARGET_NXP/TARGET_LPC11UXX/TOOLCHAIN_GCC_CS/LPC11U24.ld

@@ -27,7 +27,8 @@ MEMORY
 {
   rom (rx)  : ORIGIN = 0x00000000, LENGTH = 32K
 
-  ram (rwx) : ORIGIN = 0x100000C0, LENGTH = 0xF40
+  ram (rwx) : ORIGIN = 0x100000C0, LENGTH = 0x1F40
+  usb_ram (rwx) : ORIGIN = 0x20004000, LENGTH = 0x800
 }
 
 /* These force the linker to search for particular symbols from