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Execute FreeRTOS from RAM

Posted by Paul on April 25, 2007
Hi all

I'm using ARM9_STR91X_IAR project , and I can execute it from FLASH successfully .
Now I want to copy the image from flash to ram and execute it from ram .
I have IAP bootloader to do copy work then jump to ram .


There is a link file : lnkarm_flash.xcl
I don't know how to modify it to support execute from ram .

Thanks.


RE: Execute FreeRTOS from RAM

Posted by Nobody/Anonymous on April 25, 2007
This is an IAR file. Take a look in your IAR installation directory for a RAM equivalent.

Dave.

RE: Execute FreeRTOS from RAM

Posted by Paul on April 25, 2007
I refer some example file lnkarm_ram.xcl in the IAR installation directory . And I modify the FreeRTOS's lnkarm_flash.xcl of the following :

// Code memory in flash
//-DROMSTART=0x00000000 Marked by Paul 96.4.25
//-DROMEND=0x00080000Marked by Paul 96.4.25
//-DROMSTART=0x00080000
//-DROMEND=0x003FFFFF
//-DVECSTART=ROMSTARTMarked by Paul 96.4.25

// Data memory
-DRAMSTART=0x4000000
-DRAMEND=0x04018000

-DROMSTART=RAMSTART
-DROMEND=RAMEND

....

But when I make my workspace , it will generate some errors during linking :

Building configuration: RTOSDemo - ARM
Updating build tree...
Linking
Error[e16]: Segment DATA_Z (size: 0x123c8 align: 0x2) is too long for segment definition. At least 0x68e3 more
bytes needed. The problem occurred while processing the segment placement command
"-Z(DATA)DATA_I,DATA_Z,DATA_N=RAMSTART-RAMEND", where at the moment of placement the available
memory ranges were "CODE:400c51a-4018000"
Reserved ranges relevant to this placement:
4000000-4000107 INTVEC
4000108-400035b ICODE
400035c-400a1cb CODE
400a1cc-400a1e3 INITTAB
400a1e4-400aa2b DATA_ID
400aa2c-400bcd0 DATA_C
400bcd1-4018000 DATA_I

Total number of errors: 1
Total number of warnings: 0





RE: Execute FreeRTOS from RAM

Posted by Nobody/Anonymous on April 25, 2007
You are now putting your executable code and data both in RAM and there is not enough space.

RE: Execute FreeRTOS from RAM

Posted by Paul on April 25, 2007
My Board only have 96 KBytes SRAM . So if I want put executable code and data both in RAM , it must need more then 96 KBytes of SRAM ?


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