feat(log): Reserve first 4 bytes as zero for vars pointed to NULL

For bin log, reserve the first 4 bytes as zero for variables that are pointed to NULL
and should not be printed in the log. So the esp-idf-monitor will skip printing
those variables.

components/bootloader/subproject/main/ld/esp32/bootloader.ld

@@ -268,6 +268,9 @@ SECTIONS
    */
   .noload 0 (INFO) :
   {
+    /* Reserve first 4 bytes as zero for vars pointed to NULL */
+    . = 0;
+    LONG(0);
     _noload_keep_in_elf_start = ABSOLUTE(.);
     KEEP(*(.noload_keep_in_elf .noload_keep_in_elf.*))
     _noload_keep_in_elf_end = ABSOLUTE(.);

components/bootloader/subproject/main/ld/esp32c2/bootloader.ld

@@ -279,6 +279,9 @@ SECTIONS
    */
   .noload 0 (INFO) :
   {
+    /* Reserve first 4 bytes as zero for vars pointed to NULL */
+    . = 0;
+    LONG(0);
     _noload_keep_in_elf_start = ABSOLUTE(.);
     KEEP(*(.noload_keep_in_elf .noload_keep_in_elf.*))
     _noload_keep_in_elf_end = ABSOLUTE(.);

components/bootloader/subproject/main/ld/esp32c3/bootloader.ld

@@ -279,6 +279,9 @@ SECTIONS
    */
   .noload 0 (INFO) :
   {
+    /* Reserve first 4 bytes as zero for vars pointed to NULL */
+    . = 0;
+    LONG(0);
     _noload_keep_in_elf_start = ABSOLUTE(.);
     KEEP(*(.noload_keep_in_elf .noload_keep_in_elf.*))
     _noload_keep_in_elf_end = ABSOLUTE(.);

components/bootloader/subproject/main/ld/esp32c5/bootloader.ld

@@ -277,6 +277,9 @@ SECTIONS
    */
   .noload 0 (INFO) :
   {
+    /* Reserve first 4 bytes as zero for vars pointed to NULL */
+    . = 0;
+    LONG(0);
     _noload_keep_in_elf_start = ABSOLUTE(.);
     KEEP(*(.noload_keep_in_elf .noload_keep_in_elf.*))
     _noload_keep_in_elf_end = ABSOLUTE(.);

components/bootloader/subproject/main/ld/esp32c6/bootloader.ld

@@ -278,6 +278,9 @@ SECTIONS
    */
   .noload 0 (INFO) :
   {
+    /* Reserve first 4 bytes as zero for vars pointed to NULL */
+    . = 0;
+    LONG(0);
     _noload_keep_in_elf_start = ABSOLUTE(.);
     KEEP(*(.noload_keep_in_elf .noload_keep_in_elf.*))
     _noload_keep_in_elf_end = ABSOLUTE(.);

components/bootloader/subproject/main/ld/esp32c61/bootloader.ld

@@ -277,6 +277,9 @@ SECTIONS
    */
   .noload 0 (INFO) :
   {
+    /* Reserve first 4 bytes as zero for vars pointed to NULL */
+    . = 0;
+    LONG(0);
     _noload_keep_in_elf_start = ABSOLUTE(.);
     KEEP(*(.noload_keep_in_elf .noload_keep_in_elf.*))
     _noload_keep_in_elf_end = ABSOLUTE(.);

components/bootloader/subproject/main/ld/esp32h2/bootloader.ld

@@ -277,6 +277,9 @@ SECTIONS
    */
   .noload 0 (INFO) :
   {
+    /* Reserve first 4 bytes as zero for vars pointed to NULL */
+    . = 0;
+    LONG(0);
     _noload_keep_in_elf_start = ABSOLUTE(.);
     KEEP(*(.noload_keep_in_elf .noload_keep_in_elf.*))
     _noload_keep_in_elf_end = ABSOLUTE(.);

components/bootloader/subproject/main/ld/esp32h21/bootloader.ld

@@ -277,6 +277,9 @@ SECTIONS
    */
   .noload 0 (INFO) :
   {
+    /* Reserve first 4 bytes as zero for vars pointed to NULL */
+    . = 0;
+    LONG(0);
     _noload_keep_in_elf_start = ABSOLUTE(.);
     KEEP(*(.noload_keep_in_elf .noload_keep_in_elf.*))
     _noload_keep_in_elf_end = ABSOLUTE(.);

components/bootloader/subproject/main/ld/esp32h4/bootloader.ld

@@ -269,6 +269,20 @@ SECTIONS
    * And so forth...
    */
   /DISCARD/ : { *(.rela.*) }
+
+  /**
+   * This section is not included in the binary image; it is only present in the ELF file.
+   * It is used to keep certain symbols in the ELF file.
+   */
+  .noload 0 (INFO) :
+  {
+    /* Reserve first 4 bytes as zero for vars pointed to NULL */
+    . = 0;
+    LONG(0);
+    _noload_keep_in_elf_start = ABSOLUTE(.);
+    KEEP(*(.noload_keep_in_elf .noload_keep_in_elf.*))
+    _noload_keep_in_elf_end = ABSOLUTE(.);
+  }
 }
 
 /**

components/bootloader/subproject/main/ld/esp32p4/bootloader.ld

@@ -277,6 +277,9 @@ SECTIONS
    */
   .noload 0 (INFO) :
   {
+    /* Reserve first 4 bytes as zero for vars pointed to NULL */
+    . = 0;
+    LONG(0);
     _noload_keep_in_elf_start = ABSOLUTE(.);
     KEEP(*(.noload_keep_in_elf .noload_keep_in_elf.*))
     _noload_keep_in_elf_end = ABSOLUTE(.);

components/bootloader/subproject/main/ld/esp32s2/bootloader.ld

@@ -257,6 +257,9 @@ SECTIONS
    */
   .noload 0 (INFO) :
   {
+    /* Reserve first 4 bytes as zero for vars pointed to NULL */
+    . = 0;
+    LONG(0);
     _noload_keep_in_elf_start = ABSOLUTE(.);
     KEEP(*(.noload_keep_in_elf .noload_keep_in_elf.*))
     _noload_keep_in_elf_end = ABSOLUTE(.);

components/bootloader/subproject/main/ld/esp32s3/bootloader.ld

@@ -291,6 +291,9 @@ SECTIONS
    */
   .noload 0 (INFO) :
   {
+    /* Reserve first 4 bytes as zero for vars pointed to NULL */
+    . = 0;
+    LONG(0);
     _noload_keep_in_elf_start = ABSOLUTE(.);
     KEEP(*(.noload_keep_in_elf .noload_keep_in_elf.*))
     _noload_keep_in_elf_end = ABSOLUTE(.);

components/esp_system/ld/elf_misc.ld.in

@@ -6,6 +6,9 @@
    */
   .noload 0 (INFO) :
   {
+    /* Reserve first 4 bytes as zero for vars pointed to NULL */
+    . = 0;
+    LONG(0);
     _noload_keep_in_elf_start = ABSOLUTE(.);
     KEEP(*(.noload_keep_in_elf .noload_keep_in_elf.*))
     mapping[noload_keep_in_elf]