esp32s3内存分配问题

[heipppppp]

我的开发环境是，esp32s3,idf4.4,vscode,ubuntu18.04,我想在DRAM中分配一个128K字节大小的内存用作ringbuffer，但是声明

Code: Untitled.c Select all

DRAM_ATTR   uint8_t core0_buff[1024*128] = {0};

时就编译不通过，根据官网上的数据手册，我的DRAM为512K，DRAM应当是够的，为什么会失败呢？其次当我改变为48k

Code: Untitled.c Select all

DRAM_ATTR   uint8_t core0_buff[1024*48] = {0};

时就可以通过.（64K也不能通过）
编译通过时串口监视到的信息为：

Code: Untitled.cmake Select all

I (0) cpu_start: App cpu up.

I (284) cpu_start: Pro cpu start user code

I (284) cpu_start: cpu freq: 160000000

I (285) cpu_start: Application information:

I (287) cpu_start: Project name:     main

I (292) cpu_start: App version:      a4f820b-dirty

I (297) cpu_start: Compile time:     Nov  9 2021 17:17:54

I (303) cpu_start: ELF file SHA256:  d431ab68f95c13d1...

I (309) cpu_start: ESP-IDF:          v4.4-dev-3235-g3e370c4296-dirty

I (317) heap_init: Initializing. RAM available for dynamic allocation:

I (324) heap_init: At 3FCC8E18 len 000171E8 (92 KiB): D/IRAM

I (330) heap_init: At 3FCE0000 len 0000EE34 (59 KiB): STACK/DRAM

I (337) heap_init: At 3FCF0000 len 00008000 (32 KiB): DRAM

I (343) spiram: Adding pool of 2048K of external SPI memory to heap allocator

I (351) spi_flash: detected chip: generic

I (355) spi_flash: flash io: dio

I (360) cpu_start: Starting scheduler on PRO CPU.