Merge branch 'bugfix/s3_increase_static_alloc_size' into 'master'

bootloader, esp_system: increase static allocation space for esp32s3

See merge request espressif/esp-idf!18045

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

@@ -5,17 +5,52 @@
  */
 /** Simplified memory map for the bootloader.
  *  Make sure the bootloader can load into main memory without overwriting itself.
- *  We put 2nd bootloader in the high address space (before ROM stack/data/bss).
- *  See memory usage for ROM bootloader at the end of this file.
+ *
+ *  ESP32-S3 ROM static data usage is as follows:
+ *  - 0x3fcd7e00 - 0x3fce9704: Shared buffers, used in UART/USB/SPI download mode only
+ *  - 0x3fce9710 - 0x3fceb710: PRO CPU stack, can be reclaimed as heap after RTOS startup
+ *  - 0x3fceb710 - 0x3fced710: APP CPU stack, can be reclaimed as heap after RTOS startup
+ *  - 0x3fced710 - 0x3fcf0000: ROM .bss and .data (not easily reclaimable)
+ *
+ *  The 2nd stage bootloader can take space up to the end of ROM shared
+ *  buffers area (0x3fce9704). For alignment purpose we shall use value (0x3fce9700).
  */
 
+/* The offset between Dbus and Ibus. Used to convert between 0x403xxxxx and 0x3fcxxxxx addresses. */
+iram_dram_offset = 0x6f0000;
+
+/* We consider 0x3fce9700 to be the last usable address for 2nd stage bootloader stack overhead, dram_seg,
+ * and work out iram_seg and iram_loader_seg addresses from there, backwards.
+ */
+
+/* These lengths can be adjusted, if necessary: */
+bootloader_usable_dram_end = 0x3fce9700;
+bootloader_stack_overhead = 0x2000; /* For safety margin between bootloader data section and startup stacks */
+bootloader_dram_seg_len = 0x4000;
+bootloader_iram_loader_seg_len = 0x7000;
+bootloader_iram_seg_len = 0x3000;
+
+/* Start of the lower region is determined by region size and the end of the higher region */
+bootloader_dram_seg_end = bootloader_usable_dram_end - bootloader_stack_overhead;
+bootloader_dram_seg_start = bootloader_dram_seg_end - bootloader_dram_seg_len;
+bootloader_iram_loader_seg_start = bootloader_dram_seg_start - bootloader_iram_loader_seg_len + iram_dram_offset;
+bootloader_iram_seg_start = bootloader_iram_loader_seg_start - bootloader_iram_seg_len;
+
 MEMORY
 {
-  iram_seg (RWX) :                  org = 0x403B6000, len = 0x3000
-  iram_loader_seg (RWX) :           org = 0x403B9000, len = 0x7000
-  dram_seg (RW) :                   org = 0x3FCD0000, len = 0x4000
+  iram_seg (RWX) :                  org = bootloader_iram_seg_start, len = bootloader_iram_seg_len
+  iram_loader_seg (RWX) :           org = bootloader_iram_loader_seg_start, len = bootloader_iram_loader_seg_len
+  dram_seg (RW) :                   org = bootloader_dram_seg_start, len = bootloader_dram_seg_len
 }
 
+/* The app may use RAM for static allocations up to the start of iram_loader_seg.
+ * If you have changed something above and this assert fails:
+ * 1. Check what the new value of bootloader_iram_loader_seg start is.
+ * 2. Update the value in this assert.
+ * 3. Update SRAM_IRAM_END in components/esp_system/ld/esp32s3/memory.ld.in to the same value.
+ */
+ASSERT(bootloader_iram_loader_seg_start == 0x403cc700, "bootloader_iram_loader_seg_start inconsistent with SRAM_IRAM_END");
+
 /* Default entry point: */
 ENTRY(call_start_cpu0);
 
@@ -180,28 +215,3 @@ SECTIONS
   } > iram_seg
 
 }
-
-
-/**
- *  Appendix: Memory Usage of ROM bootloader
- *
- *  +--------+--------------+------+ 0x3FCD_8000
- *  |        ^              |
- *  |        |              |
- *  |        | data/bss     |
- *  |        |              |
- *  |        v              |
- *  +------------------------------+ 0x3FCE_9910
- *  |        ^              |
- *  |        |              |
- *  |        | stack (pro)  |
- *  |        |              |
- *  |        v              |
- *  +------------------------------+ 0x3FCE_B910
- *  |        ^              |
- *  |        |              |
- *  |        | stack (app)  |
- *  |        |              |
- *  |        v              |
- *  +--------+--------------+------+ 0x3FCE_D910
- */

components/esp_system/ld/esp32s3/memory.ld.in

@@ -36,7 +36,7 @@
 
 #define SRAM_IRAM_START     0x40370000
 #define SRAM_DIRAM_I_START  0x40378000
-#define SRAM_IRAM_END       0x403B9000
+#define SRAM_IRAM_END       0x403CC700 /* Please refer to ESP32-S3 bootloader.ld for more information on this */
 #define I_D_SRAM_OFFSET     (SRAM_DIRAM_I_START - SRAM_DRAM_START)
 
 #define SRAM_DRAM_START     0x3FC88000