[参考译文] TM4C1294NCPDT：TM4C1294NCPDT

您能否也解释一下要在.cmd 文件中进行哪些更改来添加 外部 SDRAM 部分存储器

/******************************************************************************

 * Copyright (c) 2013-2017 Texas Instruments Incorporated.  All rights reserved.
 * Software License Agreement
 * 
 * Texas Instruments (TI) is supplying this software for use solely and
 * exclusively on TI's microcontroller products. The software is owned by
 * TI and/or its suppliers, and is protected under applicable copyright
 * laws. You may not combine this software with "viral" open-source
 * software in order to form a larger program.
 * 
 * THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
 * NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
 * NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
 * CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
 * DAMAGES, FOR ANY REASON WHATSOEVER.
 * 
 *
 *****************************************************************************/

--retain=g_pfnVectors

/* The following command line options are set as part of the CCS project.    */
/* If you are building using the command line, or for some reason want to    */
/* define them here, you can uncomment and modify these lines as needed.     */
/* If you are using CCS for building, it is probably better to make any such */
/* modifications in your CCS project and leave this file alone.              */
/*                                                                           */
/* --heap_size=0                                                             */
/* --stack_size=256                                                          */
/* --library=rtsv7M3_T_le_eabi.lib                                           */

/* The starting address of the application.  Normally the interrupt vectors  */
/* must be located at the beginning of the application.                      */
#define APP_BASE	0x00000000
#define RAM_BASE	0x20000000
#define SD_RAM_BASE	0x60000000
#define APP_LENGTH	0x00016000

/* System memory map */

MEMORY
{
   /* Application stored in and executes from internal flash */
    FLASH (RX) : origin = APP_BASE, length = APP_LENGTH
    /* Application uses internal RAM for data */
    SRAM (RWX) : origin = RAM_BASE, length = 0x00060000

    SDRAM (RWX) : origin = SD_RAM_BASE, length = 0x00040000

}

/* Section allocation in memory */

SECTIONS
{
    .intvecs:   > APP_BASE
    .text   :   > FLASH
    .const  :   > FLASH
    .cinit  :   > FLASH
    .pinit  :   > FLASH
    .init_array : > FLASH

    .vtable :   > RAM_BASE
    .data   :   > SRAM
    .bss    :   > SRAM
    .sysmem :   > SRAM
    .stack  :   > SRAM

    .vtable :   > SD_RAM_BASE
    .data   :   > SDRAM
    .bss    :   > SDRAM
    .sysmem :   > SDRAM
    .stack  :   > SDRAM


#ifdef  __TI_COMPILER_VERSION__
#if     __TI_COMPILER_VERSION__ >= 15009000
    .TI.ramfunc : {} load=FLASH, run=SRAM, table(BINIT)
#endif
#endif
}

链接器文件更改是否正确、请查看  

要不是要在外部 RAM 中运行代码、还是只读取数据？ 您可以看到下面一行。 这意味着您需要在内部 SRAM 之外运行代码。 如果您没有使用外部 SRAM 运行代码、那么为什么需要将矢量表重新映射到 SD_RAM_BASE。 无论您要使用内部 RAM 还是外部 RAM 来运行代码、都必须先初始化 EPI 模块、然后将代码从闪存复制到内部 RAM 或外部 RAM 中执行。

.TI.ramfunc：｛｝load=flash、run=sram、table (BINIT)

我强烈建议您看一看 TIDM-TM4CFLASHSRAM 及其软件同事。 根据此示例、程序映像(ektm4c129_epiflash_boot_demo)由引导加载程序(ektm4c129_epiflash_bootloader)通过 EPI 接口复制到外部闪存。 程序映像仅具有以下链接器文件。 将程序映像复制到外部闪存后、引导加载程序将跳转到0x60020000处的应用。 SRAM 部分映射到位于0xA0000000的外部 SRAM。   

#define APP_BASE 0x60020000
#define RAM_BASE 0xA0000000

/* System memory map */

MEMORY
{
/* Application stored in and executes from internal flash */
FLASH (RX) : origin = APP_BASE, length = 0x00400000
/* Application uses internal RAM for data */
SRAM (RWX) : origin = 0xA0000000, length = 0x00040000
}

/* Section allocation in memory */

SECTIONS
{
.intvecs: > APP_BASE
.text : > FLASH
.const : > FLASH
.cinit : > FLASH
.pinit : > FLASH
.init_array : > FLASH

.vtable : > RAM_BASE
.data : > SRAM
.bss : > SRAM
.sysmem : > SRAM
.stack : > SRAM
}

__STACK_TOP = __stack + 256;

您好、Charles

我们会将代码复制到外部  RAM、并需要从外部 RAM 运行代码  

随后、 TIDM-TM4CFLASHSRAM 将是一个很好的参考起点。 如前所述、此示例包含名为 ektm4c129_epiflash_bootloader (见下文)的自定义引导加载程序、它会通过 EPI 接口将名为 ektm4c129_epiflash_boot_demo 的示例应用程序复制到外部闪存中。 将代码复制到外部闪存和 RAM 后、引导加载程序将跳转至外部闪存以开始执行。

我没有任何用于 TM4C1294 EVK 的外部 SRAM ,但我只有与 TM4C1294NCPDT 连接的定制 SDRAM

要在此.cmd 文件中进行的任何更改、请查看它  

/******************************************************************************
 *
 *
 * Copyright (c) 2013-2017 Texas Instruments Incorporated.  All rights reserved.
 * Software License Agreement
 * 
 * Texas Instruments (TI) is supplying this software for use solely and
 * exclusively on TI's microcontroller products. The software is owned by
 * TI and/or its suppliers, and is protected under applicable copyright
 * laws. You may not combine this software with "viral" open-source
 * software in order to form a larger program.
 * 
 * THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
 * NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
 * NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
 * CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
 * DAMAGES, FOR ANY REASON WHATSOEVER.
 * 
 *
 *****************************************************************************/

--retain=g_pfnVectors

/* The following command line options are set as part of the CCS project.    */
/* If you are building using the command line, or for some reason want to    */
/* define them here, you can uncomment and modify these lines as needed.     */
/* If you are using CCS for building, it is probably better to make any such */
/* modifications in your CCS project and leave this file alone.              */
/*                                                                           */
/* --heap_size=0                                                             */
/* --stack_size=256                                                          */
/* --library=rtsv7M3_T_le_eabi.lib                                           */

/* The starting address of the application.  Normally the interrupt vectors  */
/* must be located at the beginning of the application.                      */
#define APP_BASE	0x00000000
#define RAM_BASE	0x20000000
#define APP_LENGTH	0x00016000
#define EXSRAM_BASE	0x60000000

/* System memory map */

MEMORY
{
   /* Application stored in and executes from internal flash */
    FLASH (RX) : origin = APP_BASE, length = APP_LENGTH
    /* Application uses internal RAM for data */
    SRAM (RWX) : origin = RAM_BASE, length = 0x00040000

	EXSRAM (RWX) : origin = EXSRAM_BASE, length = 0x00040000


}

/* Section allocation in memory */

SECTIONS
{
    .intvecs:   > APP_BASE
    .text   :   > FLASH
    .const  :   > FLASH
    .cinit  :   > FLASH
    .pinit  :   > FLASH
    .init_array : > FLASH

    .vtable :   > RAM_BASE
    .data   :   > SRAM
    .bss    :   > SRAM
    .sysmem :   > SRAM
    .stack  :   > SRAM

    .vtable :   > EXSRAM_BASE
    .data   :   > EXSRAM



#ifdef  __TI_COMPILER_VERSION__
#if     __TI_COMPILER_VERSION__ >= 15009000
    .TI.ramfunc : {} load=FLASH, run=SRAM|EXSRAM, table(BINIT)
#endif
#endif
}