rp2/memmap_mp.ld: Update for latest SDK.

ports/rp2/memmap_mp.ld

@@ -35,7 +35,7 @@ SECTIONS
 {
     /* Second stage bootloader is prepended to the image. It must be 256 bytes big
        and checksummed. It is usually built by the boot_stage2 target
-       in the Pico SDK
+       in the Raspberry Pi Pico SDK
     */
 
     .flash_begin : {
@@ -59,12 +59,11 @@ SECTIONS
     */
 
     .text : {
-        __reset_start = .;
-        KEEP (*(.reset))
-        . = ALIGN(256);
-        __reset_end = .;
-        ASSERT(__reset_end - __reset_start == 256, "ERROR: reset section should only be 256 bytes");
+        __logical_binary_start = .;
         KEEP (*(.vectors))
+        KEEP (*(.binary_info_header))
+        __binary_info_header_end = .;
+        KEEP (*(.reset))
         /* TODO revisit this now memset/memcpy/float in ROM */
         /* bit of a hack right now to exclude all floating point and time critical (e.g. memset, memcpy) code from
          * FLASH ... we will include any thing excluded here in .data below by default */
@@ -247,6 +246,8 @@ SECTIONS
 
     /* Check if data + heap + stack exceeds RAM limit */
     ASSERT(__StackLimit >= __HeapLimit, "region RAM overflowed")
+
+    ASSERT( __binary_info_header_end - __logical_binary_start <= 256, "Binary info must be in first 256 bytes of the binary")
     /* todo assert on extra code */
 }