RT1176的SDRAM如何在系统使用

[jiangUndefine]

SDRAM驱动和DCD配置已经弄好了，但是想和内部RAM一样直接使用malloc，在KEIL5的配置IRAM改地址和增加地址都无法增加RAM大小，不知道如何配置SDRAM才能和内部RAM一样使用，或者只使用SDRAM也可以。

[jeremyzhou]

Hi,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
我不是很清楚你的问题，能否再解释一下。
Have a great day,
TIC

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[jiangUndefine]

SDRAM的驱动已经完成，能读写SDRAM内部数据，地址是0x80000000，例程给的代码是 SEMC_SDRAMReadWrite16Bit之类的函数测试，而不能通过库函数自带的malloc函数来调用SDRAM的空间进行读写。

[jeremyzhou]

Hi，
感谢回复。
首先，TCM类型RAM与OCRAM，SDRAM是不同的，尤其是不受cache缓存的影响，其次，你说的库函数自带的malloc函数来调用SDRAM的空间进行读写，能否给出具体的代码以及描述一下错误现象。
Have a great day,
TIC

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[jiangUndefine]

我截取了M7核的SCF配置文件如下

#define m_flash_config_start 0x30000400
#define m_flash_config_size 0x00000C00

#define m_ivt_start 0x30001000
#define m_ivt_size 0x00001000

#define m_interrupts_start 0x30002000
#define m_interrupts_size 0x00000400

#define m_text_start 0x30002400
#define m_text_size 0x00FBDC00

#define m_text2_start 0x00000000
#define m_text2_size 0x00040000

#define m_ncache_start 0x80000000
#define m_ncache_size 0x04000000

#define m_interrupts_ram_start 0x20000000
#define m_interrupts_ram_size __ram_vector_table_size__

#define m_data_start (m_interrupts_ram_start + m_interrupts_ram_size)
#define m_data_size (0x40000 - m_interrupts_ram_size)

使用的m_data_size 只有256KByte,当我需要更大内存时，是无法调用其他RAM和SDRAM块的区域，所有我想提高RAM使用的大小

[jeremyzhou]

Hi，
感谢回复。
请选择如下的option，这样工程会选择适合SDRAM应用的linker文件。

Have a great day,
TIC

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[jiangUndefine]

这里面缺少了双核和FlexSpi启动的配置，按照这个配置改了m_data_start为0x80000000后网口会卡死

[jeremyzhou]

Hi，

现在我对你的真正需求有点困惑，如何你只是想要一个合适的liker file，你参考SDK中与你功能相近的工程的linker file就好，如果不是，我觉得你最好重新描述你的需求。

Have a great day,
TIC

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[jiangUndefine]

就是说我想把SDRAM空间作为内部空间，像是与0x20000000地址一样在内部使用