LPC1768: Update linker script, support split heap (#430)

* LPC1768: Update linker script, support split heap

* Reclaim even more space if Ethernet is not used

* Fix assert

* Let's not assign absolute addresses to .

* Revert "Let's not assign absolute addresses to ."

This reverts commit 421fe70.

* aha! Remove offending ASM code

* Fix FlashIAP test failure

* Style

Author: Jamie Smith

.gitignore

@@ -103,6 +103,8 @@ cmake_install.cmake
 CMakeFiles/
 cmake_build/
 Testing/
+cmake-variants.yaml
+CMakeUserPresets.json
 
 # CLion
 cmake-build-*/

connectivity/lwipstack/lwip-sys/arch/lwip_sys_arch.c

@@ -37,7 +37,7 @@
 #  elif defined(TOOLCHAIN_GCC_CR)
 #     define ETHMEM_SECTION __attribute__((section(".data.$RamPeriph32")))
 #  else
-#     define ETHMEM_SECTION __attribute__((section("AHBSRAM0"),aligned))
+#     define ETHMEM_SECTION __attribute__((section("AHBSRAM"),aligned))
 #  endif
 #elif defined(TARGET_STM32H7)
 #  if defined (__ICCARM__)

connectivity/netsocket/tests/TESTS/netsocket/tcp/tcpsocket_recv_100k.cpp

@@ -117,7 +117,7 @@ void rcv_n_chk_against_rfc864_pattern(TCPSocket &sock)
         recvd_size += rd;
     }
     timer.stop();
-    tr_info("MBED: Time taken: %fs", timer.read());
+    tr_info("MBED: Time taken: %" PRIi64 "ms", std::chrono::duration_cast<std::chrono::milliseconds>(timer.elapsed_time()).count());
 }
 
 void TCPSOCKET_RECV_100K()
@@ -172,7 +172,7 @@ void rcv_n_chk_against_rfc864_pattern_nonblock(TCPSocket &sock)
         }
     }
     timer.stop();
-    tr_info("MBED: Time taken: %fs", timer.read());
+    tr_info("MBED: Time taken: %" PRIi64 "ms", std::chrono::duration_cast<std::chrono::milliseconds>(timer.elapsed_time()).count());
 }
 
 static void _sigio_handler(osThreadId id)

connectivity/netsocket/tests/emac_test_utils/EmacTestMemoryManager.cpp

@@ -51,7 +51,7 @@ char s_trace_buffer[100] = MEM_MNGR_TRACE;
 #  elif defined(TOOLCHAIN_GCC_CR)
 #     define ETHMEM_SECTION __attribute__((section(".data.$RamPeriph32")))
 #  else
-#     define ETHMEM_SECTION __attribute__((section("AHBSRAM0"),aligned))
+#     define ETHMEM_SECTION __attribute__((section("AHBSRAM"),aligned))
 #  endif
 #endif
 #endif

drivers/tests/TESTS/mbed_drivers/flashiap/main.cpp

@@ -249,11 +249,11 @@ void flashiap_timing_test()
     std::chrono::microseconds curr_time{};
     std::chrono::microseconds avg_erase_time{};
     unsigned int num_write_sizes;
-    unsigned int byte_usec_ratio;
+    float byte_sec_ratio;
     std::chrono::microseconds max_erase_time(0), min_erase_time(-1);
     const unsigned int max_writes = 128;
     const unsigned int max_write_sizes = 6;
-    const unsigned int max_byte_usec_ratio = 200;
+    const unsigned int max_byte_sec_ratio = 200000000;
 
     uint32_t page_size = flash_device.get_page_size();
     uint32_t write_size = page_size;
@@ -294,28 +294,33 @@ void flashiap_timing_test()
             }
             timer.reset();
             ret = flash_device.program(buf, address, write_size);
+
+            if (ret) {
+                printf("Failed programming %" PRIu32 " bytes at address 0x%" PRIx32 "\n!", write_size, address);
+                TEST_FAIL();
+            }
+
             curr_time = timer.elapsed_time();
             avg_write_time += curr_time;
-            TEST_ASSERT_EQUAL_INT32(0, ret);
             max_write_time = us_max(max_write_time, curr_time);
             min_write_time = us_min(min_write_time, curr_time);
             address += write_size;
         }
         delete[] buf;
         avg_write_time /= num_writes;
-        byte_usec_ratio = write_size / avg_write_time.count();
-        utest_printf("Write size %6u bytes: avg %10" PRIi64 ", min %10" PRIi64 ", max %10" PRIi64 " (usec), rate %10u bytes/usec\n",
-                     write_size, avg_write_time.count(), min_write_time.count(), max_write_time.count(), byte_usec_ratio);
-        TEST_ASSERT(byte_usec_ratio < max_byte_usec_ratio);
+        byte_sec_ratio = write_size / std::chrono::duration_cast<std::chrono::duration<float>>(avg_write_time).count();
+        utest_printf("Write size %6u bytes: avg %10" PRIi64 ", min %10" PRIi64 ", max %10" PRIi64 " (usec), rate %.01f bytes/sec\n",
+                     write_size, avg_write_time.count(), min_write_time.count(), max_write_time.count(), byte_sec_ratio);
+        TEST_ASSERT(byte_sec_ratio < max_byte_sec_ratio);
         write_size *= 4;
     }
 
     if (num_write_sizes) {
         avg_erase_time /= num_write_sizes;
-        byte_usec_ratio = sector_size / avg_erase_time.count();
-        utest_printf("\nErase size %6u bytes: avg %10" PRIi64 ", min %10" PRIi64 ", max %10" PRIi64" (usec), rate %10u bytes/usec\n\n",
-                     sector_size, avg_erase_time.count(), min_erase_time.count(), max_erase_time.count(), byte_usec_ratio);
-        TEST_ASSERT(byte_usec_ratio < max_byte_usec_ratio);
+        byte_sec_ratio = sector_size / std::chrono::duration_cast<std::chrono::duration<float>>(avg_erase_time).count();
+        utest_printf("\nErase size %6u bytes: avg %10" PRIi64 ", min %10" PRIi64 ", max %10" PRIi64" (usec), rate %.01f bytes/sec\n\n",
+                     sector_size, avg_erase_time.count(), min_erase_time.count(), max_erase_time.count(), byte_sec_ratio);
+        TEST_ASSERT(byte_sec_ratio < max_byte_sec_ratio);
     }
 
     ret = flash_device.deinit();

targets/TARGET_NXP/TARGET_LPC176X/device/TOOLCHAIN_GCC_ARM/LPC1768.ld

@@ -1,26 +1,36 @@
-/* Linker script for mbed LPC1768 */
-#if !defined(MBED_APP_START)
-  #define MBED_APP_START 0x00000000
-#endif
-
-#if !defined(MBED_APP_SIZE)
-  #define MBED_APP_SIZE 512K
-#endif
+/* mbed Microcontroller Library
+ * Copyright (c) 2025 Jamie Smith
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+  
+#include "../cmsis_nvic.h"
 
 #if !defined(MBED_CONF_TARGET_BOOT_STACK_SIZE)
     #define MBED_CONF_TARGET_BOOT_STACK_SIZE 0x400
 #endif
 
 STACK_SIZE = MBED_CONF_TARGET_BOOT_STACK_SIZE;
 
+#define VTORS_NEEDED_SPACE NVIC_NUM_VECTORS * 4
+
 /* Linker script to configure memory regions. */
 MEMORY
 {
-  FLASH (rx) : ORIGIN = MBED_APP_START, LENGTH = MBED_APP_SIZE
-  RAM (rwx) : ORIGIN = 0x100000C8, LENGTH = (32K - 0xC8 - 32)  /* topmost 32 bytes used by IAP functions */
-
-  USB_RAM(rwx) : ORIGIN = 0x2007C000, LENGTH = 16K
-  ETH_RAM(rwx) : ORIGIN = 0x20080000, LENGTH = 16K
+  FLASH (rx) : ORIGIN = MBED_CONFIGURED_ROM_BANK_IROM1_START, LENGTH = MBED_CONFIGURED_ROM_BANK_IROM1_SIZE
+  RAM (rwx) : ORIGIN = MBED_RAM_BANK_IRAM1_START + VTORS_NEEDED_SPACE, LENGTH = (MBED_RAM_BANK_IRAM1_SIZE - VTORS_NEEDED_SPACE - 32)  /* topmost 32 bytes used by IAP functions */
+  AHBSRAM(rwx) : ORIGIN = MBED_RAM_BANK_IRAM2_START, LENGTH = MBED_RAM_BANK_IRAM2_SIZE
 }
 
 /* Linker script to place sections and symbol values. Should be used together
@@ -56,9 +66,13 @@ SECTIONS
     .text :
     {
         KEEP(*(.isr_vector))
-        /* Code Read Protect data */
+
+#if MBED_CONFIGURED_ROM_BANK_IROM1_START == MBED_ROM_BANK_IROM1_START
+        /* Code Read Protect data, if this is at the start of flash*/
         . = 0x000002FC ;
         KEEP(*(.CRPSection))
+#endif
+
         /* End of Code Read Protect */
         *(.text*)
 
@@ -144,14 +158,13 @@ SECTIONS
         Image$$RW_IRAM1$$ZI$$Limit = . ;
     } > RAM
 
-    
-    .heap (NOLOAD):
+    .heap_0 (NOLOAD): ALIGN(8)
     {
         __end__ = .;
         end = __end__;
-        *(.heap*)
-        . = ORIGIN(RAM) + LENGTH(RAM) - STACK_SIZE;
-        __HeapLimit = .;
+        __mbed_sbrk_start_0 = .;
+        . = (ORIGIN(RAM) + LENGTH(RAM) - STACK_SIZE);
+        __mbed_krbs_start_0 = .;
     } > RAM
 
     /* .stack_dummy section doesn't contains any symbols. It is only
@@ -169,24 +182,23 @@ SECTIONS
     PROVIDE(__stack = __StackTop);
 
     /* Check if data + heap + stack exceeds RAM limit */
-    ASSERT(__StackLimit >= __HeapLimit, "region RAM overflowed with stack")
+    ASSERT(__StackLimit >= __end__, "region RAM overflowed with stack")
 
 
     /* Code can explicitly ask for data to be 
-       placed in these higher RAM banks where
+       placed in this higher RAM bank where
        they will be left uninitialized. 
     */
-    .AHBSRAM0 (NOLOAD):
+    .AHBSRAM_bss (NOLOAD):
     {
-        Image$$RW_IRAM2$$Base = . ;
-        *(AHBSRAM0)
-        Image$$RW_IRAM2$$ZI$$Limit = .;
-    } > USB_RAM
+        *(AHBSRAM)
+    } > AHBSRAM
 
-    .AHBSRAM1 (NOLOAD):
+    /* Fill remaining space in AHBSRAM with additional heap */
+    .heap (NOLOAD): ALIGN(8)
     {
-        Image$$RW_IRAM3$$Base = . ;
-        *(AHBSRAM1)
-        Image$$RW_IRAM3$$ZI$$Limit = .;
-    } > ETH_RAM
+        __mbed_sbrk_start = .;
+        . = ORIGIN(AHBSRAM) + LENGTH(AHBSRAM);
+        __mbed_krbs_start = .;
+    } > AHBSRAM
 }

targets/TARGET_NXP/TARGET_LPC176X/device/TOOLCHAIN_GCC_ARM/startup_LPC17xx.S

@@ -30,21 +30,6 @@
    aborting compilation, it is not the run time limit:
    Heap_Size + Stack_Size = 0x80 + 0x80 = 0x100
  */
-
-    .section .heap
-    .align 3
-#ifdef __HEAP_SIZE
-    .equ    Heap_Size, __HEAP_SIZE
-#else
-    .equ    Heap_Size, 0x800
-#endif
-    .globl    __HeapBase
-    .globl    __HeapLimit
-__HeapBase:
-    .space    Heap_Size
-    .size __HeapBase, . - __HeapBase
-__HeapLimit:
-    .size __HeapLimit, . - __HeapLimit
 
     .section .isr_vector
     .align 2

targets/TARGET_NXP/TARGET_LPC176X/device/cmsis_nvic.h

@@ -31,7 +31,7 @@
 #ifndef MBED_CMSIS_NVIC_H
 #define MBED_CMSIS_NVIC_H
 
-#define NVIC_NUM_VECTORS        (16 + 33)
+#define NVIC_NUM_VECTORS        (16 + 35)
 #define NVIC_RAM_VECTOR_ADDRESS 0x10000000    // Location of vectors in RAM
 
 #endif

targets/TARGET_NXP/TARGET_LPC176X/device/flash_api.c

@@ -22,6 +22,8 @@
 #include "cmsis.h"
 #include <stdlib.h>
 #include <string.h>
+#include <stdio.h>
+#include <inttypes.h>
 
 #define MEMMAP     (*((volatile unsigned long *) 0x400FC040))
 
@@ -122,10 +124,18 @@ int32_t flash_program_page(flash_t *obj, uint32_t address,
     // On LPC1768, the first RAM bank starts at 0x1000000, so anywhere below that has to be flash.
     // The IAP firmware does not support flash to flash copies, so if the source data is in flash
     // it must be buffered in RAM.
-    bool isFlashToFlashCopy = (ptrdiff_t)(data) < 0x10000000;
+    // Additionally, there seems to be an issue where the IAP ROM won't operate if a source page to be copied
+    // crosses the boundary between AHBSRAM0 and AHBSRAM1
+    const bool startsInAHBSRAM1 = ((uint32_t)data) >= MBED_CONFIGURED_RAM_BANK_IRAM2_START && ((uint32_t)data) < (MBED_CONFIGURED_RAM_BANK_IRAM2_START + 16384);
+    const bool endsInAHBSRAM2 = startsInAHBSRAM1 && ((((uint32_t)data) + size) >= MBED_CONFIGURED_RAM_BANK_IRAM2_START + 16384);
+    const bool sourceAddressPageAligned = (((uint32_t)data) % pageSize) == 0;
+    bool mustBuffer = ((ptrdiff_t)(data) < MBED_CONFIGURED_RAM_BANK_IRAM1_START) || (startsInAHBSRAM1 && endsInAHBSRAM2 && !sourceAddressPageAligned);
+
+    // printf("Flash program: flash address = 0x%" PRIx32 ", source data = 0x%" PRIx32 ", size = 0x%" PRIx32 ", startsInAHBSRAM1 = %d, endsInAHBSRAM2=%d, mustBuffer=%d\n",
+    //         address, (ptrdiff_t)data, size, !!startsInAHBSRAM1, !!endsInAHBSRAM2, !!mustBuffer);
 
     // check word boundary
-    if (isFlashToFlashCopy) {
+    if (mustBuffer) {
         // always malloc outside critical section
         tempBuffer = malloc(pageSize);
         if (tempBuffer == 0) {
@@ -140,7 +150,7 @@ int32_t flash_program_page(flash_t *obj, uint32_t address,
     for(size_t pageIdx = 0; pageIdx < (size / pageSize); ++pageIdx)
     {
         uint8_t * pageSourceAddr = source + (pageIdx * pageSize);
-        if (isFlashToFlashCopy) {
+        if (mustBuffer) {
             memcpy(tempBuffer, pageSourceAddr, pageSize);
             pageSourceAddr = tempBuffer;
         }
@@ -166,6 +176,7 @@ int32_t flash_program_page(flash_t *obj, uint32_t address,
         IAP_Call (&IAP.cmd, &IAP.stat); // Call IAP Command
         if (IAP.stat) {
             core_util_critical_section_exit();
+            //printf("IAP copy failed, address=0x%lx, pageSourceAddr=0x%lx, pageSize=%u\n", address, pageSourceAddr, pageSize);
             return -1; // Command Failed
         }
 

targets/targets.json5

@@ -419,6 +419,9 @@ mode is recommended for target MCUs with small amounts of flash and RAM.",
         "supported_toolchains": [
             "GCC_ARM"
         ],
+        "macros": [
+            "MBED_SPLIT_HEAP"
+        ],
         "device_has": [
             "RTC",
             "USTICKER",