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8.0

Copying Initialized global variables from ROM to RAM

Asked by naseeam in C Programming Language

Tags: global, c, ram, rom, variable

In Renesas/Mitsubishi M32R Family based system, linker puts initialized global variables in section ROM_D.  At run-time these globals variables need to be copied to section D of RAM.  This copying can be described in 'C' language because linker automatically generates the labels which indicate the start and end address of each section.  For example, label __TOP_ROM_D is generated to specify the start address of initialized global variables in ROM.

PLEASE CORRECT ME IF I'M WRONG.  First I'll extern these labels as follows:

extern unsigned char  __TOP_D;   /* Starting address of initialized global variables in RAM */
extern unsigned char  __TOP_ROM_D;   /* starting address of initialized global variables in ROM */
extern unsigned char  __END_D;    /* Ending address of intialized global variable in RAM */

Then, I'll copy from ROM to RAM as follows:

memcpy(__TOP_D, __TOP_ROM_D, __END_D - __TOP_D);

Please use attach link to refer to linker manual for more information.  In particular, see sections 5.1 and 5.2.3 and Figures 5.1 and 5.2.

http://documentation.renesas.com/eng/products/tool/rej10j0515_m3tcc32r_u.pdf
[+][-]05/30/07 02:23 PM, ID: 19183599Author Comment

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[+][-]05/31/07 02:27 AM, ID: 19186498Accepted Solution

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About this solution

Zone: C Programming Language
Tags: global, c, ram, rom, variable
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Solution Provided By: sburck
Participating Experts: 1
Solution Grade: A
 
 
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