esp_system: create ld template to abstract few common settings

PMS aware chips require prefetch padding size for instruction fetch, or
some memory alignment considerations. These settings are now exposed
through kconfig options (hidden) and used through common ld template.
This shall help to add and manage future chips support easily for
these considerations.

Closes IDF-3624

components/esp_system/ld/esp32h2/memory.ld.in

@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 /**
  *                    ESP32-H2 Linker Script Memory Layout
  * This file describes the memory layout (memory blocks) by virtual memory addresses.
@@ -7,6 +13,7 @@
  */
 
 #include "sdkconfig.h"
+#include "ld.common"
 
 #ifdef CONFIG_BOOTLOADER_CUSTOM_RESERVE_RTC
 #define ESP_BOOTLOADER_RESERVE_RTC (CONFIG_BOOTLOADER_RESERVE_RTC_SIZE + CONFIG_BOOTLOADER_CUSTOM_RESERVE_RTC_SIZE)

components/esp_system/ld/esp32h2/sections.ld.in

@@ -1,3 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2021 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 /* Default entry point */
 ENTRY(call_start_cpu0);
 
@@ -365,8 +371,9 @@ SECTIONS
   /* Marks the end of IRAM code segment */
   .iram0.text_end (NOLOAD) :
   {
-    /* C3 memprot requires 512 B alignment for split lines */
-    . = ALIGN (0x200);
+    /* ESP32-H2 memprot requires 16B padding for possible CPU prefetch and 512B alignment for PMS split lines */
+    . += _esp_memprot_prefetch_pad_size;
+    . = ALIGN(_esp_memprot_align_size);
     /* iram_end_test section exists for use by memprot unit tests only */
     *(.iram_end_test)
     _iram_text_end = ABSOLUTE(.);