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Tuesday, February 20, 2018

Problem using paged memory
Daniel M. Feb 20, 2018 at 09:20 PM (21:20 hours)
Staff: Takao Y.

4 comments

Hi,

I have been using CodeWarrior IDE v5.9.0 build 5294 (Development Studio for S12(X) v5.2 build 151201) on a Windows7 machine for about a year to upload assembly code to the DEVKIT S12G128 board using P&E USB BDM Multilink without any problems. Last week I started using paged memory as my project has exceeded 64K. I now receive an error message when trying to upload code to the DEVKIT S12G128.

I can't even upload the following simple program:

;include definitions

INCLUDE 'derivative.inc'
ORG $4000

entry: LDS #$4000 ;SP initially points to
address $4000
LDAA #$01

CALL sub1

INCA

loop: BRA loop

ORG PAGE_0AStart

sub1: INCA

RTC

;****************************************
;* Interrupt Vectors *
;****************************************

ORG $FFFE
DC.W entry ;Reset Vector

Pressing "Make" assembles this program without a problem, and I can view the main.asm.o.lst file but when I connect the DEVKIT S12G128 and press "Debug" I receive the following "Elf Loader" error messages:

"Error while writing to 28000...28200.
Information:No memory at this address."

followed by a "HI-WAVE" "Failed to load" message.

Programs that do not have paged memory upload without any problems.

I've searched on this forum and the NXP forum but don't know what to do.

I tried opening a new project and also tried uploading from another computer with the same version of CodeWarrior, but the same error messages appear.

I posted on the NXP forum and someone said global addresses must be used to write to flash, does ORG $4000 need to be changed? I'm confused.

Can someone please tell me what changes need to be made to the code above to get it to work?

Comment #1 Daniel M. - February 20, 2018 - 09:20 PM (21:20 hours)

Comments

```
Greetings,

What does the linker script look like? 


Takao Yamada
```
Comment #2 Takao Y. (PEMicro Staff) - February 21, 2018 - 10:20 AM (10:20 hours)

Hi Takao, 

Thanks for looking into this. The problem has been resolved. I received another reply on the NXP forum explaining that the error was occurring because in my code I was using ORG PAGE_0AStart, where

PAGE_0AStart:     equ    $00028000
 
This is a global address and I was accessing out of memory. 

Instead of “PAGE_0AStart” I should have used the alternative address “$0A8000”. Similarly “PAGE_0BStart” should be “$0B8000”. 

I tested the amended code and everything is now working. The amended code is:
             INCLUDE 'derivative.inc'
             ORG  $4000
entry:       LDS  #$4000
             LDAA   #$01
             CALL  sub1
             INCA
loop:        BRA loop
             ORG    $0A8000 
sub1:        INCA
             RTC

However for my own learning, is the linker script the “burner.bbl” file in the “prm” folder? The contents of this file are:

/* logical s-record file */
OPENFILE "%ABS_FILE%.s19"
format=motorola
busWidth=1
origin=0
len=0x1000000
destination=0
SRECORD=Sx
SENDBYTE 1 "%ABS_FILE%"
CLOSE

/* physical s-record file */
OPENFILE "%ABS_FILE%.phy"
format = motorola
busWidth = 1
len = 0x4000

/* logical non banked flash at $4000 and $C000 to physical */
origin = 0x1400
destination = 0x001400
len = 0xC00
SENDBYTE 1 "%ABS_FILE%"

origin = 0x004000
destination = 0x34000
len = 0x4000
SENDBYTE 1 "%ABS_FILE%"

origin = 0x00C000
destination = 0x3C000
len = 0x4000
SENDBYTE 1 "%ABS_FILE%"

/* logical 128 kB banked flash to physical */
origin = 0x088000
destination = 0x020000
len = 0x4000
SENDBYTE 1 "%ABS_FILE%"

origin = 0x098000
destination = 0x24000
len = 0x4000
SENDBYTE 1 "%ABS_FILE%"

origin = 0x0A8000
destination = 0x288000
len = 0x4000
SENDBYTE 1 "%ABS_FILE%"

origin = 0x0B8000
destination = 0x2C000
len = 0x4000
SENDBYTE 1 "%ABS_FILE%"

origin = 0x0C8000
destination = 0x030000
len = 0x1400
SENDBYTE 1 "%ABS_FILE%"

origin = 0x0CA000
destination = 0x032000
len = 0x2000
SENDBYTE 1 "%ABS_FILE%"

origin = 0x0D8000
destination = 0x034000
len = 0x4000
SENDBYTE 1 "%ABS_FILE%"

origin = 0x0E8000
destination = 0x038000
len = 0x4000
SENDBYTE 1 "%ABS_FILE%"

origin = 0x0F8000
destination = 0x03C000
len = 0x4000
SENDBYTE 1 "%ABS_FILE%"

CLOSE

Regards, 

Daniel

Comment #3 Daniel M. - February 22, 2018 - 04:40 AM (04:40 hours)

Greetings,

Thank you for the reply and update. This will hopefully be useful for all engineers, including us.


Takao Yamada

Comment #4 Takao Y. (PEMicro Staff) - February 22, 2018 - 08:54 AM (08:54 hours)

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