Merge branch 'feature/ext_ram_allocatable_using_heap_alloc_cap' into 'master'

Make external RAM allocatable using heap_alloc_cap

See merge request !1226

components/esp32/Kconfig

@@ -57,8 +57,7 @@ choice SPIRAM_USE
 config SPIRAM_USE_MEMMAP
     bool "Integrate RAM into ESP32 memory map"
 config SPIRAM_USE_CAPS_ALLOC
-    bool "Make RAM allocatable using heap_caps_malloc(..., MALLOC_CAP_SPISRAM)"
-    depends on TO_BE_DONE
+    bool "Make RAM allocatable using heap_caps_malloc(..., MALLOC_CAP_SPIRAM)"
 config SPIRAM_USE_MALLOC
     bool "Make RAM allocatable using malloc as well"
     depends on TO_BE_DONE

components/esp32/clk.c

@@ -174,7 +174,10 @@ void esp_perip_clk_init(void)
                               DPORT_LEDC_CLK_EN |
                               DPORT_UHCI1_CLK_EN |
                               DPORT_TIMERGROUP1_CLK_EN |
+//80MHz SPIRAM uses SPI2 as well; it's initialized before this is called. Do not disable the clock for that if this is enabled.
+#if !CONFIG_SPIRAM_SPEED_80M
                               DPORT_SPI_CLK_EN_2 |
+#endif
                               DPORT_PWM0_CLK_EN |
                               DPORT_I2C_EXT1_CLK_EN |
                               DPORT_CAN_CLK_EN |
@@ -196,6 +199,7 @@ void esp_perip_clk_init(void)
                               DPORT_WIFI_CLK_SDIO_HOST_EN |
                               DPORT_WIFI_CLK_EMAC_EN;
     }
+
     /* Change I2S clock to audio PLL first. Because if I2S uses 160MHz clock,
      * the current is not reduced when disable I2S clock.
      */

components/esp32/cpu_start.c

@@ -255,6 +255,15 @@ void start_cpu0_default(void)
 {
     esp_err_t err;
     esp_setup_syscall_table();
+
+#if CONFIG_SPIRAM_BOOT_INIT && (CONFIG_SPIRAM_USE_CAPS_ALLOC || CONFIG_SPIRAM_USE_MALLOC)
+    esp_err_t r=esp_spiram_add_to_heapalloc();
+    if (r != ESP_OK) {
+        ESP_EARLY_LOGE(TAG, "External RAM could not be added to heap!");
+        abort();
+    }
+#endif
+
 //Enable trace memory and immediately start trace.
 #if CONFIG_ESP32_TRAX
 #if CONFIG_ESP32_TRAX_TWOBANKS

components/esp32/include/esp_spiram.h

@@ -39,6 +39,12 @@ esp_err_t esp_spiram_init();
 bool esp_spiram_test();
 
 
+/**
+ * @brief Add the initialized SPI RAM to the heap allocator.
+ */
+esp_err_t esp_spiram_add_to_heapalloc();
+
+
 /**
  * @brief Get the size of the attached SPI RAM chip selected in menuconfig
  *

components/esp32/spiram.c

@@ -28,6 +28,8 @@ we add more types of external RAM memory, this can be made into a more intellige
 #include "freertos/FreeRTOS.h"
 #include "freertos/xtensa_api.h"
 #include "soc/soc.h"
+#include "esp_heap_caps_init.h"
+#include "soc/soc_memory_layout.h"
 #include "soc/dport_reg.h"
 #include "rom/cache.h"
 
@@ -120,6 +122,12 @@ esp_err_t esp_spiram_init()
 }
 
 
+esp_err_t esp_spiram_add_to_heapalloc()
+{
+    //Add entire external RAM region to heap allocator. Heap allocator knows the capabilities of this type of memory, so there's
+    //no need to explicitly specify them.
+    return heap_caps_add_region((intptr_t)SOC_EXTRAM_DATA_LOW, (intptr_t)SOC_EXTRAM_DATA_LOW + CONFIG_SPIRAM_SIZE-1);
+}
 
 size_t esp_spiram_get_size()
 {

components/esp32/spiram_psram.c

@@ -94,9 +94,6 @@ typedef enum {
 
 static psram_cache_mode_t s_psram_mode = PSRAM_CACHE_MAX;
 
-//For now, we only use F40M + S40M, and we don't have to go through gpio matrix
-#define ENABLE_GPIO_MATRIX_SPI   1
-
 /* dummy_len_plus values defined in ROM for SPI flash configuration */
 extern uint8_t g_rom_spiflash_dummy_len_plus[];
 
@@ -528,9 +525,7 @@ esp_err_t IRAM_ATTR psram_enable(psram_cache_mode_t mode, psram_vaddr_mode_t vad
     }
     CLEAR_PERI_REG_MASK(SPI_USER_REG(PSRAM_SPI_1), SPI_CS_SETUP_M);
 
-#if ENABLE_GPIO_MATRIX_SPI
     psram_gpio_config(mode);
-#endif
     WRITE_PERI_REG(GPIO_ENABLE_W1TS_REG, BIT(PSRAM_CS_IO)| BIT(PSRAM_CLK_IO));
     PIN_FUNC_SELECT(GPIO_PIN_MUX_REG[PSRAM_CS_IO], 2);
     PIN_FUNC_SELECT(GPIO_PIN_MUX_REG[PSRAM_CLK_IO], 2);

components/esp32/test/test_spiram_cache_flush.c

@@ -56,12 +56,15 @@ TEST_CASE("Spiram cache flush on mmap", "[spiram][ignore]")
     void *mem[2];
     res[0]=0; res[1]=0;
 #if CONFIG_SPIRAM_USE_CAPS_ALLOC
-    mem[0]=pvPortMallocCaps(TSTSZ, MALLOC_CAP_SPIRAM);
-    mem[1]=pvPortMallocCaps(TSTSZ, MALLOC_CAP_SPIRAM);
+    printf("Allocating SPI RAM chunk...\n");
+    mem[0]=heap_caps_malloc(TSTSZ, MALLOC_CAP_SPIRAM);
+    mem[1]=heap_caps_malloc(TSTSZ, MALLOC_CAP_SPIRAM);
 #else
     mem[0]=(void*)0x3f800000;
     mem[1]=(void*)0x3f800000+TSTSZ;
 #endif
+    assert(mem[0]);
+    assert(mem[1]);
     TaskHandle_t th[2];
     err[0]=0; err[1]=0;
     printf("Creating tasks\n");
@@ -99,12 +102,15 @@ TEST_CASE("Spiram cache flush on write/read", "[spiram][ignore]")
     void *mem[2];
     res[0]=0; res[1]=0;
 #if CONFIG_SPIRAM_USE_CAPS_ALLOC
-    mem[0]=pvPortMallocCaps(TSTSZ, MALLOC_CAP_SPIRAM);
-    mem[1]=pvPortMallocCaps(TSTSZ, MALLOC_CAP_SPIRAM);
+    printf("Allocating SPI RAM chunk...\n");
+    mem[0]=heap_caps_malloc(TSTSZ, MALLOC_CAP_SPIRAM);
+    mem[1]=heap_caps_malloc(TSTSZ, MALLOC_CAP_SPIRAM);
 #else
     mem[0]=(void*)0x3f800000;
     mem[1]=(void*)0x3f800000+TSTSZ;
 #endif
+    assert(mem[0]);
+    assert(mem[1]);
     TaskHandle_t th[2];
     const esp_partition_t* part = get_test_data_partition();
     assert(part!=NULL);
@@ -138,4 +144,40 @@ TEST_CASE("Spiram cache flush on write/read", "[spiram][ignore]")
 #endif
 }
 
+IRAM_ATTR TEST_CASE("Spiram memcmp weirdness at 80MHz", "[spiram][ignore]") {
+    char *mem1=malloc(0x10000);
+#if CONFIG_SPIRAM_USE_CAPS_ALLOC
+    char *mem2=heap_caps_malloc(0x10000, MALLOC_CAP_SPIRAM);
+#else
+    char *mem2=(void*)0x3f800000;
+#endif
+
+#if !CONFIG_SPIRAM_SPEED_80M
+    printf("**** WARNING **** Spi memory isn't running at 80MHz, so this test is somewhat meaningless.\n");
+#endif
+
+    printf("RAM: Got %p and %p\n", mem1, mem2);
+    assert(mem1);
+    assert(mem2);
+    for (int i=0; i<0x10000; i++) mem1[i]=i^0xAAAAAAAA;
+    
+    for (int cycle=1; cycle<100; cycle++) {
+        memcpy(mem2, mem1, 0x10000);
+        if (memcmp(mem1, mem2, 0x10000)!=0) {
+            printf("Memcmp failed! Cycle %d\n", cycle);
+            for (int i=0; i<0x10000; i++) {
+                if (mem1[i]!=mem2[i]) {
+                    printf("Found real difference at index %d: 0x%x vs 0x%x\n", i, mem1[i], mem2[i]);
+                    break;
+                }
+            }
+        }
+    }
+}
+
+
 #endif  //CONFIG_SPIRAM_USE_CAPS_ALLOC || CONFIG_SPIRAM_USE_MEMMAP
+
+
+
+

components/heap/heap_caps.c

@@ -133,6 +133,24 @@ IRAM_ATTR void *heap_caps_malloc( size_t size, uint32_t caps )
     return NULL;
 }
 
+/*
+ Default memory allocation implementation. Should return standard 8-bit memory. malloc() essentially resolves to this function.
+*/
+IRAM_ATTR void *heap_caps_malloc_default( size_t size )
+{
+    return heap_caps_malloc( size, MALLOC_CAP_8BIT | MALLOC_CAP_INTERNAL );
+}
+
+/*
+ Same for realloc()
+ Note: keep the logic in here the same as in heap_caps_malloc_default (or merge the two as soon as this gets more complex...)
+ */
+IRAM_ATTR void *heap_caps_realloc_default( void *ptr, size_t size )
+{
+    return heap_caps_realloc( ptr, size, MALLOC_CAP_8BIT | MALLOC_CAP_INTERNAL );
+}
+
+
 /* Find the heap which belongs to ptr, or return NULL if it's
    not in any heap.
 

components/heap/heap_caps_init.c

@@ -180,7 +180,7 @@ void heap_caps_init()
 
     heap_t *heaps_array = NULL;
     for (int i = 0; i < num_heaps; i++) {
-        if (heap_caps_match(&temp_heaps[i], MALLOC_CAP_8BIT)) {
+        if (heap_caps_match(&temp_heaps[i], MALLOC_CAP_8BIT|MALLOC_CAP_INTERNAL)) {
             /* use the first DRAM heap which can fit the data */
             heaps_array = multi_heap_malloc(temp_heaps[i].heap, sizeof(heap_t) * num_heaps);
             if (heaps_array != NULL) {

components/heap/heap_private.h

@@ -48,6 +48,16 @@ extern SLIST_HEAD(registered_heap_ll, heap_t_) registered_heaps;
 
 bool heap_caps_match(const heap_t *heap, uint32_t caps);
 
+
+/*
+ Because we don't want to add _another_ known allocation method to the stack of functions to trace wrt memory tracing,
+ these are declared private. The newlib malloc()/realloc() implementation also calls these, so they are declared 
+ separately in newlib/syscalls.c.
+*/
+void *heap_caps_realloc_default(void *p, size_t size);
+void *heap_caps_malloc_default(size_t size);
+
+
 #ifdef __cplusplus
 }
 #endif

components/heap/heap_trace.c

@@ -25,6 +25,8 @@
 #include "freertos/task.h"
 #include "soc/soc_memory_layout.h"
 
+#include "heap_private.h"
+
 #define STACK_DEPTH CONFIG_HEAP_TRACING_STACK_DEPTH
 
 static portMUX_TYPE trace_mux = portMUX_INITIALIZER_UNLOCKED;
@@ -303,13 +305,25 @@ static IRAM_ATTR __attribute__((noinline)) void get_call_stack(void **callers)
 _Static_assert(STACK_DEPTH >= 0 && STACK_DEPTH <= 10, "CONFIG_HEAP_TRACING_STACK_DEPTH must be in range 0-10");
 
 
+typedef enum {
+    TRACE_MALLOC_CAPS,
+    TRACE_MALLOC_DEFAULT
+} trace_malloc_mode_t;
+
+
 void *__real_heap_caps_malloc(size_t size, uint32_t caps);
 
 /* trace any 'malloc' event */
-static IRAM_ATTR __attribute__((noinline)) void *trace_malloc(size_t size, uint32_t caps)
+static IRAM_ATTR __attribute__((noinline)) void *trace_malloc(size_t size, uint32_t caps, trace_malloc_mode_t mode)
 {
     uint32_t ccount = get_ccount();
-    void *p = __real_heap_caps_malloc(size, caps);
+    void *p;
+    if ( mode == TRACE_MALLOC_CAPS ) {
+        p = __real_heap_caps_malloc(size, caps);
+    } else { //TRACE_MALLOC_DEFAULT
+        p = heap_caps_malloc_default(size);
+    }
+
     if (tracing && p != NULL) {
         heap_trace_record_t rec = {
             .address = p,
@@ -338,7 +352,7 @@ static IRAM_ATTR __attribute__((noinline)) void trace_free(void *p)
 void * __real_heap_caps_realloc(void *p, size_t size, uint32_t caps);
 
 /* trace any 'realloc' event */
-static IRAM_ATTR __attribute__((noinline)) void *trace_realloc(void *p, size_t size, uint32_t caps)
+static IRAM_ATTR __attribute__((noinline)) void *trace_realloc(void *p, size_t size, uint32_t caps, trace_malloc_mode_t mode)
 {
     void *callers[STACK_DEPTH];
     uint32_t ccount = get_ccount();
@@ -346,7 +360,12 @@ static IRAM_ATTR __attribute__((noinline)) void *trace_realloc(void *p, size_t s
         get_call_stack(callers);
         record_free(p, callers);
     }
-    void *r = __real_heap_caps_realloc(p, size, caps);
+    void *r;
+    if (mode == TRACE_MALLOC_CAPS ) {
+        r = __real_heap_caps_realloc(p, size, caps);
+    } else { //TRACE_MALLOC_DEFAULT
+        r = heap_caps_realloc_default(p, size);
+    }
     if (tracing && r != NULL) {
         get_call_stack(callers);
         if (p != NULL) {
@@ -370,7 +389,7 @@ static IRAM_ATTR __attribute__((noinline)) void *trace_realloc(void *p, size_t s
 
 IRAM_ATTR void *__wrap_malloc(size_t size)
 {
-    return trace_malloc(size, MALLOC_CAP_8BIT);
+    return trace_malloc(size, 0, TRACE_MALLOC_DEFAULT);
 }
 
 IRAM_ATTR void __wrap_free(void *p)
@@ -380,13 +399,13 @@ IRAM_ATTR void __wrap_free(void *p)
 
 IRAM_ATTR void *__wrap_realloc(void *p, size_t size)
 {
-    return trace_realloc(p, size, MALLOC_CAP_8BIT);
+    return trace_realloc(p, size, 0, TRACE_MALLOC_DEFAULT);
 }
 
 IRAM_ATTR void *__wrap_calloc(size_t nmemb, size_t size)
 {
     size = size * nmemb;
-    void *result = trace_malloc(size, MALLOC_CAP_8BIT);
+    void *result = trace_malloc(size, 0, TRACE_MALLOC_DEFAULT);
     if (result != NULL) {
         memset(result, 0, size);
     }
@@ -395,12 +414,12 @@ IRAM_ATTR void *__wrap_calloc(size_t nmemb, size_t size)
 
 IRAM_ATTR void *__wrap_heap_caps_malloc(size_t size, uint32_t caps)
 {
-    return trace_malloc(size, caps);
+    return trace_malloc(size, caps, TRACE_MALLOC_CAPS);
 }
 
 IRAM_ATTR void __wrap_heap_caps_free(void *p) __attribute__((alias("__wrap_free")));
 
 IRAM_ATTR void *__wrap_heap_caps_realloc(void *p, size_t size, uint32_t caps)
 {
-    return trace_realloc(p, size, caps);
+    return trace_realloc(p, size, caps, TRACE_MALLOC_CAPS);
 }

components/heap/include/esp_heap_caps.h

@@ -30,7 +30,8 @@
 #define MALLOC_CAP_PID5             (1<<7)  ///< Memory must be mapped to PID5 memory space (PIDs are not currently used)
 #define MALLOC_CAP_PID6             (1<<8)  ///< Memory must be mapped to PID6 memory space (PIDs are not currently used)
 #define MALLOC_CAP_PID7             (1<<9)  ///< Memory must be mapped to PID7 memory space (PIDs are not currently used)
-#define MALLOC_CAP_SPISRAM          (1<<10) ///< Memory must be in SPI SRAM
+#define MALLOC_CAP_SPIRAM           (1<<10) ///< Memory must be in SPI RAM
+#define MALLOC_CAP_INTERNAL         (1<<11) ///< Memory must be internal; specifically it should not disappear when flash/spiram cache is switched off
 #define MALLOC_CAP_INVALID          (1<<31) ///< Memory can't be used / list end marker
 
 /**
@@ -48,6 +49,7 @@
  */
 void *heap_caps_malloc(size_t size, uint32_t caps);
 
+
 /**
  * @brief Free memory previously allocated via heap_caps_malloc() or heap_caps_realloc().
  *

components/newlib/syscalls.c

@@ -23,9 +23,18 @@
 #include "freertos/FreeRTOS.h"
 #include "esp_heap_caps.h"
 
+
+/*
+ These contain the business logic for the malloc() and realloc() implementation. Because of heap tracing
+ wrapping reasons, we do not want these to be a public api, however, so they're not defined publicly.
+*/
+extern void *heap_caps_malloc_default( size_t size );
+extern void *heap_caps_realloc_default( void *ptr, size_t size );
+
+
 void* IRAM_ATTR _malloc_r(struct _reent *r, size_t size)
 {
-    return heap_caps_malloc( size, MALLOC_CAP_8BIT );
+    return heap_caps_malloc_default( size );
 }
 
 void IRAM_ATTR _free_r(struct _reent *r, void* ptr)
@@ -35,12 +44,12 @@ void IRAM_ATTR _free_r(struct _reent *r, void* ptr)
 
 void* IRAM_ATTR _realloc_r(struct _reent *r, void* ptr, size_t size)
 {
-    return heap_caps_realloc( ptr, size, MALLOC_CAP_8BIT );
+    return heap_caps_realloc_default( ptr, size );
 }
 
 void* IRAM_ATTR _calloc_r(struct _reent *r, size_t count, size_t size)
 {
-    void* result = heap_caps_malloc(count * size, MALLOC_CAP_8BIT);
+    void* result = heap_caps_malloc_default(count * size);
     if (result) {
         bzero(result, count * size);
     }

components/soc/esp32/soc_memory_layout.c

@@ -40,28 +40,28 @@ The prioritised capabilities work roughly like this:
 */
 const soc_memory_type_desc_t soc_memory_types[] = {
     //Type 0: Plain ole D-port RAM
-    { "DRAM", { MALLOC_CAP_DMA|MALLOC_CAP_8BIT, MALLOC_CAP_32BIT, 0 }, false, false},
+    { "DRAM", { MALLOC_CAP_DMA|MALLOC_CAP_8BIT|MALLOC_CAP_INTERNAL, MALLOC_CAP_32BIT, 0 }, false, false},
     //Type 1: Plain ole D-port RAM which has an alias on the I-port
     //(This DRAM is also the region used by ROM during startup)
-    { "D/IRAM", { 0, MALLOC_CAP_DMA|MALLOC_CAP_8BIT, MALLOC_CAP_32BIT|MALLOC_CAP_EXEC }, true, true},
+    { "D/IRAM", { 0, MALLOC_CAP_DMA|MALLOC_CAP_8BIT|MALLOC_CAP_INTERNAL, MALLOC_CAP_32BIT|MALLOC_CAP_EXEC }, true, true},
     //Type 2: IRAM
-    { "IRAM", { MALLOC_CAP_EXEC|MALLOC_CAP_32BIT, 0, 0 }, false, false},
+    { "IRAM", { MALLOC_CAP_EXEC|MALLOC_CAP_32BIT|MALLOC_CAP_INTERNAL, 0, 0 }, false, false},
     //Type 3-8: PID 2-7 IRAM
-    { "PID2IRAM", { MALLOC_CAP_PID2, 0, MALLOC_CAP_EXEC|MALLOC_CAP_32BIT }, false, false},
-    { "PID3IRAM", { MALLOC_CAP_PID3, 0, MALLOC_CAP_EXEC|MALLOC_CAP_32BIT }, false, false},
-    { "PID4IRAM", { MALLOC_CAP_PID4, 0, MALLOC_CAP_EXEC|MALLOC_CAP_32BIT }, false, false},
-    { "PID5IRAM", { MALLOC_CAP_PID5, 0, MALLOC_CAP_EXEC|MALLOC_CAP_32BIT }, false, false},
-    { "PID6IRAM", { MALLOC_CAP_PID6, 0, MALLOC_CAP_EXEC|MALLOC_CAP_32BIT }, false, false},
-    { "PID7IRAM", { MALLOC_CAP_PID7, 0, MALLOC_CAP_EXEC|MALLOC_CAP_32BIT }, false, false},
+    { "PID2IRAM", { MALLOC_CAP_PID2|MALLOC_CAP_INTERNAL, 0, MALLOC_CAP_EXEC|MALLOC_CAP_32BIT }, false, false},
+    { "PID3IRAM", { MALLOC_CAP_PID3|MALLOC_CAP_INTERNAL, 0, MALLOC_CAP_EXEC|MALLOC_CAP_32BIT }, false, false},
+    { "PID4IRAM", { MALLOC_CAP_PID4|MALLOC_CAP_INTERNAL, 0, MALLOC_CAP_EXEC|MALLOC_CAP_32BIT }, false, false},
+    { "PID5IRAM", { MALLOC_CAP_PID5|MALLOC_CAP_INTERNAL, 0, MALLOC_CAP_EXEC|MALLOC_CAP_32BIT }, false, false},
+    { "PID6IRAM", { MALLOC_CAP_PID6|MALLOC_CAP_INTERNAL, 0, MALLOC_CAP_EXEC|MALLOC_CAP_32BIT }, false, false},
+    { "PID7IRAM", { MALLOC_CAP_PID7|MALLOC_CAP_INTERNAL, 0, MALLOC_CAP_EXEC|MALLOC_CAP_32BIT }, false, false},
     //Type 9-14: PID 2-7 DRAM
-    { "PID2DRAM", { MALLOC_CAP_PID2, MALLOC_CAP_8BIT, MALLOC_CAP_32BIT }, false, false},
-    { "PID3DRAM", { MALLOC_CAP_PID3, MALLOC_CAP_8BIT, MALLOC_CAP_32BIT }, false, false},
-    { "PID4DRAM", { MALLOC_CAP_PID4, MALLOC_CAP_8BIT, MALLOC_CAP_32BIT }, false, false},
-    { "PID5DRAM", { MALLOC_CAP_PID5, MALLOC_CAP_8BIT, MALLOC_CAP_32BIT }, false, false},
-    { "PID6DRAM", { MALLOC_CAP_PID6, MALLOC_CAP_8BIT, MALLOC_CAP_32BIT }, false, false},
-    { "PID7DRAM", { MALLOC_CAP_PID7, MALLOC_CAP_8BIT, MALLOC_CAP_32BIT }, false, false},
+    { "PID2DRAM", { MALLOC_CAP_PID2|MALLOC_CAP_INTERNAL, MALLOC_CAP_8BIT, MALLOC_CAP_32BIT }, false, false},
+    { "PID3DRAM", { MALLOC_CAP_PID3|MALLOC_CAP_INTERNAL, MALLOC_CAP_8BIT, MALLOC_CAP_32BIT }, false, false},
+    { "PID4DRAM", { MALLOC_CAP_PID4|MALLOC_CAP_INTERNAL, MALLOC_CAP_8BIT, MALLOC_CAP_32BIT }, false, false},
+    { "PID5DRAM", { MALLOC_CAP_PID5|MALLOC_CAP_INTERNAL, MALLOC_CAP_8BIT, MALLOC_CAP_32BIT }, false, false},
+    { "PID6DRAM", { MALLOC_CAP_PID6|MALLOC_CAP_INTERNAL, MALLOC_CAP_8BIT, MALLOC_CAP_32BIT }, false, false},
+    { "PID7DRAM", { MALLOC_CAP_PID7|MALLOC_CAP_INTERNAL, MALLOC_CAP_8BIT, MALLOC_CAP_32BIT }, false, false},
     //Type 15: SPI SRAM data
-    { "SPISRAM", { MALLOC_CAP_SPISRAM, 0, MALLOC_CAP_DMA|MALLOC_CAP_8BIT|MALLOC_CAP_32BIT}, false, false},
+    { "SPIRAM", { MALLOC_CAP_SPIRAM, 0, MALLOC_CAP_DMA|MALLOC_CAP_8BIT|MALLOC_CAP_32BIT}, false, false},
 };
 
 const size_t soc_memory_type_count = sizeof(soc_memory_types)/sizeof(soc_memory_type_desc_t);
@@ -73,7 +73,7 @@ Because of requirements in the coalescing code which merges adjacent regions, th
 from low to high start address.
 */
 const soc_memory_region_t soc_memory_regions[] = {
-    { 0x3F800000, 0x20000, 15, 0}, //SPI SRAM, if available
+    { 0x3F800000, 0x400000, 15, 0}, //SPI SRAM, if available
     { 0x3FFAE000, 0x2000, 0, 0}, //pool 16 <- used for rom code
     { 0x3FFB0000, 0x8000, 0, 0}, //pool 15 <- if BT is enabled, used as BT HW shared memory
     { 0x3FFB8000, 0x8000, 0, 0}, //pool 14 <- if BT is enabled, used data memory for BT ROM functions.
@@ -170,9 +170,7 @@ const soc_reserved_region_t soc_reserved_regions[] = {
 #endif
 #endif
 
-#if 1 // SPI ram not supported yet
-    { 0x3f800000, 0x3f820000 }, //SPI SRAM not installed
-#endif
+    { 0x3f800000, 0x3fC00000 }, //SPI RAM gets added later if needed, in spiram.c; reserve it for now
 };
 
 const size_t soc_reserved_region_count = sizeof(soc_reserved_regions)/sizeof(soc_reserved_region_t);