fix linker script bug using ALL of RAM (#1872)

Author: kilograham

src/rp2_common/pico_crt0/rp2040/memmap_blocked_ram.ld

@@ -213,11 +213,10 @@ SECTIONS
         __end__ = .;
         end = __end__;
         KEEP(*(.heap*))
-        /* historically on GCC sbrk was growing past __HeapLimit to __StackLimit, however
-           to be more compatible, we now set __HeapLimit explicitly to where the end of the heap is */
-        . = ORIGIN(RAM) + LENGTH(RAM);
-        __HeapLimit = .;
     } > RAM
+    /* historically on GCC sbrk was growing past __HeapLimit to __StackLimit, however
+       to be more compatible, we now set __HeapLimit explicitly to where the end of the heap is */
+    __HeapLimit = ORIGIN(RAM) + LENGTH(RAM);
 
     /* Start and end symbols must be word-aligned */
     .scratch_x : {

src/rp2_common/pico_crt0/rp2040/memmap_copy_to_ram.ld

@@ -214,11 +214,10 @@ SECTIONS
         __end__ = .;
         end = __end__;
         KEEP(*(.heap*))
-        /* historically on GCC sbrk was growing past __HeapLimit to __StackLimit, however
-           to be more compatible, we now set __HeapLimit explicitly to where the end of the heap is */
-        . = ORIGIN(RAM) + LENGTH(RAM);
-        __HeapLimit = .;
     } > RAM
+    /* historically on GCC sbrk was growing past __HeapLimit to __StackLimit, however
+       to be more compatible, we now set __HeapLimit explicitly to where the end of the heap is */
+    __HeapLimit = ORIGIN(RAM) + LENGTH(RAM);
 
     /* Start and end symbols must be word-aligned */
     .scratch_x : {

src/rp2_common/pico_crt0/rp2040/memmap_default.ld

@@ -213,11 +213,10 @@ SECTIONS
         __end__ = .;
         end = __end__;
         KEEP(*(.heap*))
-        /* historically on GCC sbrk was growing past __HeapLimit to __StackLimit, however
-           to be more compatible, we now set __HeapLimit explicitly to where the end of the heap is */
-        . = ORIGIN(RAM) + LENGTH(RAM);
-        __HeapLimit = .;
     } > RAM
+    /* historically on GCC sbrk was growing past __HeapLimit to __StackLimit, however
+       to be more compatible, we now set __HeapLimit explicitly to where the end of the heap is */
+    __HeapLimit = ORIGIN(RAM) + LENGTH(RAM);
 
     /* Start and end symbols must be word-aligned */
     .scratch_x : {

src/rp2_common/pico_crt0/rp2040/memmap_no_flash.ld

@@ -181,11 +181,10 @@ SECTIONS
         __end__ = .;
         end = __end__;
         KEEP(*(.heap*))
-        /* historically on GCC sbrk was growing past __HeapLimit to __StackLimit, however
-           to be more compatible, we now set __HeapLimit explicitly to where the end of the heap is */
-        . = ORIGIN(RAM) + LENGTH(RAM);
-        __HeapLimit = .;
     } > RAM
+    /* historically on GCC sbrk was growing past __HeapLimit to __StackLimit, however
+       to be more compatible, we now set __HeapLimit explicitly to where the end of the heap is */
+    __HeapLimit = ORIGIN(RAM) + LENGTH(RAM);
 
     /* Start and end symbols must be word-aligned */
     .scratch_x : {

src/rp2_common/pico_crt0/rp2350/memmap_copy_to_ram.ld

@@ -234,11 +234,10 @@ SECTIONS
         __end__ = .;
         end = __end__;
         KEEP(*(.heap*))
-        /* historically on GCC sbrk was growing past __HeapLimit to __StackLimit, however
-           to be more compatible, we now set __HeapLimit explicitly to where the end of the heap is */
-        . = ORIGIN(RAM) + LENGTH(RAM);
-        __HeapLimit = .;
     } > RAM
+    /* historically on GCC sbrk was growing past __HeapLimit to __StackLimit, however
+       to be more compatible, we now set __HeapLimit explicitly to where the end of the heap is */
+    __HeapLimit = ORIGIN(RAM) + LENGTH(RAM);
 
     /* Start and end symbols must be word-aligned */
     .scratch_x : {

src/rp2_common/pico_crt0/rp2350/memmap_default.ld

@@ -227,11 +227,10 @@ SECTIONS
         __end__ = .;
         end = __end__;
         KEEP(*(.heap*))
-        /* historically on GCC sbrk was growing past __HeapLimit to __StackLimit, however
-           to be more compatible, we now set __HeapLimit explicitly to where the end of the heap is */
-        . = ORIGIN(RAM) + LENGTH(RAM);
-        __HeapLimit = .;
     } > RAM
+    /* historically on GCC sbrk was growing past __HeapLimit to __StackLimit, however
+       to be more compatible, we now set __HeapLimit explicitly to where the end of the heap is */
+    __HeapLimit = ORIGIN(RAM) + LENGTH(RAM);
 
     /* Start and end symbols must be word-aligned */
     .scratch_x : {

src/rp2_common/pico_crt0/rp2350/memmap_no_flash.ld

@@ -186,11 +186,10 @@ SECTIONS
         __end__ = .;
         end = __end__;
         KEEP(*(.heap*))
-        /* historically on GCC sbrk was growing past __HeapLimit to __StackLimit, however
-           to be more compatible, we now set __HeapLimit explicitly to where the end of the heap is */
-        . = ORIGIN(RAM) + LENGTH(RAM);
-        __HeapLimit = .;
     } > RAM
+    /* historically on GCC sbrk was growing past __HeapLimit to __StackLimit, however
+       to be more compatible, we now set __HeapLimit explicitly to where the end of the heap is */
+    __HeapLimit = ORIGIN(RAM) + LENGTH(RAM);
 
     /* Start and end symbols must be word-aligned */
     .scratch_x : {