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Freescale SemiconductorApplication Note

Document Number: AN4367Rev. 0, 09/2011

Ethernet Bootloader for MCU

by:

Alejandro Lozano, Alí PiñaMexico

Guadalajara

Contents

1Introduction

This document describes how to use an Ethernet bootloaderprovided by Freescale. This Ethernet bootloader is supportedin different platforms, such as Kinetis, MCF52259, and

MCF51CN128. This application note is focused on the Kinetisfamily, which has an ARM Cortex-M4 core. The software andmain tests were performed on a K60N512. It explains how tomodify the .lcf and .icf link files of CW and IAR IDEs

respectively, in order to add the Ethernet bootloader supportfor your application.

Introduction................................................................1Overview....................................................................12.12.2

Bootloader architecture..................................1Bootloader sequence......................................2

Developing an application with Ethernet

bootloader support ....................................................33.1

Developing a bareboard applicationin IAR with Ethernet bootloader

support............................................................4Developing a bareboard application inCodeWarrior for MCU 10.1 with

Ethernet bootloader support...........................6Developing an MQX application inCodeWarrior for MCU 10.1 with

Ethernet bootloader support.........................11

3.2

2Overview

A bootloader is a small piece of software that allows the userto download/update either code or data into flash memory.The communication layer between the MCU and the host,which contains the new application binary, might differdepending on the use case. This communication interfacecould be SPI I2C, Ethernet, and USB, etc. For this scenario,use an Ethernet communication interface. The bootloaderprovided will work as a TFTP client and the DHCP featurewill be used.

45678

3.3

Running Ethernet bootloader..................................13Conclusion...............................................................19Appendix A: IAR linker configuration

file (.icf)...................................................................19Appendix B: Linker command file (.lcf) in

CodeWarrior bareboard project..............................20Appendix C. Linker command file (.lcf) in

CodeWarrior MQX project.....................................21

Overview2.1Bootloader architecture

The bootloader is placed into the first 48 KB of the on-chip flash memory, but the actual size of the bootloader can besmaller. The user application can be placed into the flash area above the bootloader flash area. The last 4 KB of the flashmemory must be reserved for the bootloader's parameters storage, which is defined by the size of the erase-page of the on-chip flash memory.

The following figure shows the memory map and the bootloader memory footprint. The bootloader code is located in the firstaddress of the flash memory, 0x0000_0000 to 0x0000_BFFF. The bootloader parameters are located in the first address ofthe last logical-block of the flash memory, 0x0007_F000 to 0x0008_0000 (in Kinetis MK60n512).

Figure 1. Memory map

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Developing an application with Ethernet bootloader support2.2Bootloader sequence

The following figure shows the bootloader sequence, after the power-on reset, a boot value is read. This boot value is the onethat determines if the application will run after the reset ‘go’, execute a programmed script ‘script’ or the bootloader enters ina ‘stop’ mode.

The default boot value is stop. In this mode after the power-on reset the bootloader just executes. You can modify certainparameters of the bootloader like the image that will be downloaded; for instance, you can program a script that can beexecuted after a reset as long as the ‘script’ mode is set.

Figure 2. Ethernet bootloader sequence

In 'script' mode, you can program commands like: ‘dhcp; erase all; tftp; set boot go; save; go’

A brief description of this script is explained in \"Running the ethernet bootloader.\" The script is either executed or not if akey is pressed within 5 seconds after reset.

The ‘go’ mode forces the MCU to enter into the user application, if any key is pressed within 5 seconds.

3Developing an application with Ethernet bootloadersupport

This section details how to modify the application linker command file (.lcf for CW and .icf for IAR) to reserve space in theflash area where the bootloader will reside. The application code must be placed in a different section of flash area. This iswhere it becomes necessary to modify the LCF or the ICF for CW and IAR, respectively.

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Developing an application with Ethernet bootloader support3.1Developing a bareboard application in IAR with Ethernet

bootloader support

At this point you can use your own project in IAR or an example project that you can search at the www.freescale.com forKINETIS512_SC.

This case will use a “Hello World” project that can be found at this path …\\kinetis-sc\\ build\\iar\\hello_world. The followingsteps show how to modify the application linker command file.

1.Open hello_world.eww workspace.

2.Change the target to FLASH_512KB_PFLASH, and open 512KB_Pflash.icf.

Figure 3. Linker command (.icf) file without notifications

3.Modifying the .icf link file.

a.Modify the start address in flash of your application from 0x0000_0000 to 0x0000_C000, including ROM VectorTable and the code start.

define symbol __ICFEDIT_intvec_start__ = 0x0000C000;define symbol __ICFEDIT_region_ROM_start__ = 0x0000C000;define symbol __ICFEDIT_region_ROM_end__ = 0x00080000;define exported symbol __VECTOR_TABLE = 0x0000C000;define exported symbol __VECTOR_RAM = 0x1fff0000;define symbol __code_start__ = 0x0000C410;

b.Convert the split RAM section into only one RAM section by deleting section RAM2 and increasing RAMsection up to 0x2001_0000.

define symbol __ICFEDIT_region_RAM_start__ = 0x1FFF0410;define symbol __ICFEDIT_region_RAM_end__ = 0x20010000;

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Developing an application with Ethernet bootloader support//define symbol __region_RAM2_start__ = 0x20000000;//define symbol __region_RAM2_end__ = 0x20010000;

c.Create a Flash section for the bootloader parameters. This section is needed only if the application is going tochange the bootloader parameters. First you will need to define the start and end address of the section. So youneed to define two symbols that represent those values:

define symbol FappParams_start__= __ICFEDIT_region_ROM_end__ - (2*0x400); //FAPPdefine symbol FappParams_end__ = __ICFEDIT_region_ROM_end__-1; //FAPP

Then, create the ROM region into which the application will be placed.

define region ROM_region = mem:[from __ICFEDIT_region_ROM_start__ to

__ICFEDIT_region_ROM_end__-1] - mem:[from FappParams_start__ to FappParams_end__];define region RAM_region = mem:[from __ICFEDIT_region_RAM_start__ to __ICFEDIT_region_RAM_end__-1]; //| mem:[from __region_RAM2_start__ to __region_RAM2_end__-1];

place at address mem:FappParams_start__ { section fapp_params }; //APP

An entire modified .icf file is shown in Appendix A.

4.Compile and link the project. Read the .map file to check whether the application code is located in the expected flashaddress.

Figure 4. Memory map output file after linker command file is modified.

Now the generated .srec file is ready to be downloaded to your MCU through the Ethernet bootloader and is availablein the output folder of the project. You can find it as shown in the following figure. This file is needed for section 4.

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Developing an application with Ethernet bootloader supportFigure 5. Location of the s-rec file.

3.2Developing a bareboard application in CodeWarrior for MCU

10.1 with Ethernet bootloader support

In order to create a bareboard application, you can either create a new project in CodeWarrior (CW) 10.1, or use an existingproject. For the purpose of this application note a new project is created.

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Developing an application with Ethernet bootloader support1.Create a stationary bareboard project for MK60N512 going to File >New >Bareboard Project and follow the procedureshown below.

Figure 6. Creating a barebord project in CodeWarrior.

2.Change the target to MK60N512VMD100_INTERNAL_FLASH, and open MK60N512VMD100_flash.lcf

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Developing an application with Ethernet bootloader supportFigure 7. Internal flash target in CW.

3.Modify the .lcf file

a.Modify the start address in flash of your application from 0x0000 to 0xC000, including ROM Vector Table.

# 48KB (Reserved for Ethernet Bootloader)

fnet_bootloader (RX) : ORIGIN = 0x00000000, LENGTH = 0x0000C000 m_interrupts (RX) : ORIGIN = 0x0000C000, LENGTH = 0x000001E0

m_text (RX) : ORIGIN = 0x0000C400, LENGTH = 0x0007F000-0x0000C400

b.Remove the m_cfmprtrom region, because you will not use this area. Because it is reserved for flash protectionregisters, the bootloader will handle this section.

# m_cfmprotrom (RX) : ORIGIN = 0x00000400, LENGTH = 0x00000010# .cfmprotect :# {

# *(.cfmconfig)# . = ALIGN (0x4);# } > m_cfmprotrom

c.Create a flash section for the bootloader parameters.

# 4Kbytes (Last logical-block reserved for parameters)

fnet_params (RW) : ORIGIN = 0x0007F000,LENGTH = 0x00001000

An entire modified .lcf file is shown in Appendix B.

4.Compile the project. By default, CodeWarrior does not generate a link map file; you will need to enable this feature asshown in the following figure.

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Developing an application with Ethernet bootloader supportFigure 8. Enabling link map output.

5.Read the .xmap file to check whether the application code is located in the expected flash address.

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Developing an application with Ethernet bootloader supportFigure 9. Memory map output file after linker command file is modified in CW.

Now the generated.S19 file is ready to be downloaded to your MCU through the Ethernet bootloader. You canfind .S19 file as shown in the following figure. This file is needed in section 4.

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Developing an application with Ethernet bootloader supportFigure 10. Location of the .S19 file.

3.3Developing an MQX application in CodeWarrior for MCU 10.1

with Ethernet bootloader support

This scenario uses a “Hello World” project that can be found at C:\\Program Files\\Freescale\\Freescale MQX 3.7\\mqx\\examples\\hello\\cw10\\hello_twrk60n512.

1.Drag and drop .project file of the hello_twrk60n512 project into the CodeWarrior Projects window.

2.By default, MQX allocates the vector table at the first address of the flash memory, 0x0000-0000. Because this regionof flash memory is used by the Ethernet bootloader, it will be necessary to reallocate the vector table in a RAM section.To reallocate, open the libraries (bsp_twrk60n512 psp_twrk60n512), add the following macro into user_config.h, andrecompile both libraries. You can find more information about this procedure in the section 2.4 Freescale CodeWarrior

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Developing an application with Ethernet bootloader supportDevelopment Studio version 10.1 from the “Getting Started” document C:\\Program Files\\Freescale\\Freescale MQX3.7\\doc\\FSL_MQX_Getting_Started.pdf.

#define MQX_ROM_VECTORS 0

3.Change the target to MK60N512VMD100_INTERNAL_FLASH, and open MK60N512VMD100_flash.lcf

4.Modify the .lcf file

a.Modify the start address in flash of your application from 0x0000_0000 to 0x0000_C000, including ROM VectorTable.

# 48KB (Reserved for Ethernet Bootloader)

fnet_bootloader (RX) : ORIGIN = 0x00000000, LENGTH = 0x0000C000

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Running Ethernet bootloadervectorrom (RX): ORIGIN = 0x0000C000, LENGTH = 0x00000410

rom (RX) : ORIGIN = 0x0000C420, LENGTH = 0x0007F000-0x0000C420

b.Remove the m_cfmprtrom region, because you will not use this area. Because it is reserved for flash protectionregisters, the bootloader will handle this section. Comment the m_cfmprotrom section as shown below.

# m_cfmprotrom (RX) : ORIGIN = 0x00000400, LENGTH = 0x00000010# .cfmprotect :# {

# *(.cfmconfig)# . = ALIGN (0x4);# } > m_cfmprotrom

c.Create a flash section for the bootloader parameters.

# 4Kbytes (Last logical-block reserved for parameters)

fnet_params (RW) : ORIGIN = 0x0007F000,LENGTH = 0x00001000

An entire modified .lcf file is shown in Appendix C.

5.Read the .xmap file to check whether the application code is located in the expected flash address.

Now the generated .afx.S19 file is ready to be downloaded to your MCU through the Ethernet bootloader. You can findthe .S19 file in this path C:\\Program Files\\Freescale\\Freescale MQX 3.7\\mqx\\examples\\hello\\cw10\\hello_twrk60n512\\Int Flash Debug. This file is needed for the next section.

4Running Ethernet bootloader

For the purpose of this document the following tools and hardware were used:•••••

IAR Systems Embedded Workbench 6.0.3Terminal program (Windows Hyperterminal)

TFTP Server and Client (Tftpd version 3.33 http://tftpd32.jounin.net/)Ethernet bootloader source code, coming with this documentTWR-K60N512-KIT

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Running Ethernet bootloaderThe following steps show you how to run the Ethernet bootloader in the MK60N512:

1.Open the Ethernet bootloader project by drag and drop the twrk60n512_boot.ewp file located in C:\\Program Files\\Freescale\\FNET 1.0.0\\fnet_demos\\mk60n512\\boot\\iararm6.1 into IAR IDE.2.Compile using FLASH_512KB_PFLASH target and program the device.

Figure 11. Default bootloader configurations.

Note: You can change the default parameters of the Ethernet bootloader, such as the name of the s-rec file (.s19

or .srec), the maximum length of string shell, and the scripts. Perform these changes by modifying fapp_user_config.h.The following figure shows the values used in this document.

Prepare your TWR-K60N512-KIT according to the TWR-K60N512 User's Manual.

Use the RS-232 male/female DB-9 serial cable to connect your PC (through COM port) to the tower board, using theTWR-SER.

Connect the tower board to an LAN network.

Invoke the terminal program on the PC to which the tower board is connected and configure it to:a.Bits per second: 115200.b.Data bits: 8.c.Parity: none.d.Stop bits: 1.

e.Flow control: None.

3.4.5.6.

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Running Ethernet bootloader7.Start TFTP Server:

a.Start TFTP Server application. Go to [Start]->[Programs]->[Tftpd32]->[Tftpd32]

b.Press the [Settings] button and set the TFTP server base directory (for example C:\\TFTP-Root):

8.Power off and power on back your board. You can also push the SW5 to reset the board.

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Running Ethernet bootloader9.In your terminal program window you should see the Ethernet bootloader welcome message as shown below:

10.The Ethernet bootloader is now ready to accept user commands. Enter the “help” command to display a list of all

commands available within the shell of the bootloader:

Type “dhcp” to get an IP address. In case you don’t have a DHCP client the MCU will have the default IP address thatcan be modified in the fnet_user_config.h file in the next line:

#define FNET_CFG_ETH_IP_ADDR (FNET_GEN_ADDR(192, 168, 1, 22))

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Running Ethernet bootloader11.Type “set tfpt ” to set tfpt firmware server. In this case, use 10.112.96.116.

12.Type “set script 'dhcp\\; erase all\\; tftp\\; set boot go\\; save\\; reset'” to change the script parameters.

13.When all parameters are set correctly for your system, set the “boot” parameter to the script value. To do this type “set

boot script” to set the script value.

14.Enter the “save” command to save all run-time parameters to a non-volatile memory (it is located in the last erase page

of the on-chip flash memory).15.Type “reset”.

16.In your terminal program window you should see the Ethernet bootloader with the scrip already loaded and ready to

run the user application:

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Running Ethernet bootloader17.If any key was pressed within 5 seconds after reset, the Ethernet bootloader will execute the script programmed before.

18.At this point, the application resides in the flash area, and if any key is pressed after 5 seconds the application will run

until a reset is executed.

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ConclusionThe Ethernet bootloader includes 3 different scenarios. The explained options are:•Bareboard application in IAR with Ethernet bootloader support.

•Bareboard application in CodeWarrior for MCU 10.1 with Ethernet bootloader support.•MQX application in CodeWarrior for MCU 10.1 with Ethernet bootloader support.

Each option is explained in detail, providing the developer the needed steps to embed the Ethernet bootloader in any product.This variety of implementations offers the developer the possibility to choose the best option for their applications.The usage guide of the bootloader is also provided. This gives the users specific information in order to use the Ethernetbootloader.

This application note helps the developers to include Ethernet bootloaders in their products, using a quick and easy approach.

5Conclusion

6Appendix A: IAR linker configuration file (.icf)

/*###ICF### Section handled by ICF editor, don't touch! ****//*-Editor annotation file-*/

/* IcfEditorFile=\"$TOOLKIT_DIR$\\config\\ide\\IcfEditor\\cortex_v1_0.xml\" *//*-Specials-*/

define symbol __ICFEDIT_intvec_start__ = 0x0000C000;/*-Memory Regions-*/

define symbol __ICFEDIT_region_ROM_start__ = 0x0000C000;define symbol __ICFEDIT_region_ROM_end__ = 0x00080000;define symbol __ICFEDIT_region_RAM_start__ = 0x1FFF0410;define symbol __ICFEDIT_region_RAM_end__ = 0x20010000;/*-Sizes-*/

define symbol __ICFEDIT_size_cstack__ = 0x1000;define symbol __ICFEDIT_size_heap__ = 0x200;/**** End of ICF editor section. ###ICF###*/

define symbol FappParams_start__= __ICFEDIT_region_ROM_end__ - (2*0x400); //FAPPdefine symbol FappParams_end__ = __ICFEDIT_region_ROM_end__-1; //FAPP//define symbol __region_RAM2_start__ = 0x20000000;//define symbol __region_RAM2_end__ = 0x20010000;define exported symbol __VECTOR_TABLE = 0x0000C000;define exported symbol __VECTOR_RAM = 0x1fff0000;

define exported symbol __BOOT_STACK_ADDRESS = __ICFEDIT_region_RAM_end__ - 8; //0x2000FFF8;

define symbol __code_start__ = 0x0000C410;

define memory mem with size = 4G;

//define region ROM_region = mem:[from __ICFEDIT_region_ROM_start__ to __ICFEDIT_region_ROM_end__];

//define region RAM_region = mem:[from __ICFEDIT_region_RAM_start__ to

__ICFEDIT_region_RAM_end__] | mem:[from __region_RAM2_start__ to __region_RAM2_end__];define region ROM_region = mem:[from __ICFEDIT_region_ROM_start__ to

__ICFEDIT_region_ROM_end__-1] - mem:[from FappParams_start__ to FappParams_end__];define region RAM_region = mem:[from __ICFEDIT_region_RAM_start__ to

__ICFEDIT_region_RAM_end__-1]; //| mem:[from __region_RAM2_start__ to __region_RAM2_end__-1];define block CSTACK with alignment = 8, size = __ICFEDIT_size_cstack__ { };define block HEAP with alignment = 8, size = __ICFEDIT_size_heap__ { };initialize manually { readwrite };initialize manually { section .data};

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Appendix B: Linker command file (.lcf) in CodeWarrior bareboard projectinitialize manually { section .textrw };do not initialize { section .noinit };

define block CodeRelocate { section .textrw_init };define block CodeRelocateRam { section .textrw };

place at address mem:__ICFEDIT_intvec_start__ { readonly section .intvec };place at address mem:__code_start__ { readonly section .noinit };

place at address mem:FappParams_start__ { section fapp_params }; //APPplace in ROM_region { readonly, block CodeRelocate};place in RAM_region { readwrite, block CodeRelocateRam, block CSTACK, block HEAP };

7Appendix B: Linker command file (.lcf) in CodeWarriorbareboard project

# Default linker command file.MEMORY {

fnet_bootloader (RX) : ORIGIN = 0x00000000, LENGTH = 0x0000C000 # 48KB (Reserved for FNET Bootloader)

m_interrupts (RX) : ORIGIN = 0x0000C000, LENGTH = 0x000001E0

m_text (RX) : ORIGIN = 0x0000C410, LENGTH = 0x00080000-0x0000C410

fnet_params (RW) : ORIGIN = 0x20010000,LENGTH = 0x00001000 # 4Kbytes (Last logical-block reserved for parameters)

m_data (RW) : ORIGIN = 0x1FFF0000, LENGTH = 0x00020000#m_cfmprotrom (RX) : ORIGIN = 0x0000C400, LENGTH = 0x00000010}

KEEP_SECTION { .vectortable }KEEP_SECTION { .cfmconfig }SECTIONS {

.interrupts :{

__vector_table = .; * (.vectortable) . = ALIGN (0x4);} > m_interrupts#.cfmprotect :#{

# *(.cfmconfig)# . = ALIGN (0x4);#} > m_cfmprotrom

.app_text: {

ALIGNALL(4); * (.init) * (.text)

.= ALIGN(0x8) ; * (.rodata)

.= ALIGN(0x4) ; ___ROM_AT = .;} > m_text

.app_data: AT(___ROM_AT){

* (.sdata) * (.data)

.= ALIGN(0x4) ; *(.ARM.extab)

.= ALIGN(0x4) ;

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Appendix C. Linker command file (.lcf) in CodeWarrior MQX project __exception_table_start__ = .; EXCEPTION

__exception_table_end__ = .; .= ALIGN(0x4) ; __sinit__ = .; STATICINIT

.= ALIGN(0x8) ;} > m_data.bss :{

.= ALIGN(0x4) ; __START_BSS = .; * (.bss)

__END_BSS = .; .= ALIGN(0x8) ;} >> m_data

_romp_at = ___ROM_AT + SIZEOF(.app_data);.romp : AT(_romp_at){

__S_romp = _romp_at; WRITEW(___ROM_AT);

WRITEW(ADDR(.app_data)); WRITEW(SIZEOF(.app_data)); WRITEW(0); WRITEW(0); WRITEW(0);}

__SP_INIT = . + 0x00008000;__heap_addr = __SP_INIT;__heap_size = 0x00008000;}

8Appendix C. Linker command file (.lcf) in CodeWarriorMQX project

MEMORY{

fnet_bootloader (RX) : ORIGIN = 0x00000000, LENGTH = 0x0000C000 # 48KB (Reserved for FNET Bootloader)

vectorrom (RX): ORIGIN = 0x0000C000, LENGTH = 0x00000410 #cfmprotrom (RX): ORIGIN = 0x00000410, LENGTH = 0x00000010

rom (RX): ORIGIN = 0x0000C420, LENGTH = 0x0007FBE0 # Code + Const data ram (RW): ORIGIN = 0x1FFF0000, LENGTH = 0x00020000 # SRAM - RW data # kernel space starts after RAM variables (Location of MQX Kernel data + MQX heap) end_of_kd (RW): ORIGIN = 0x2000FFF0, LENGTH = 0x00000000

# Boot stack reused by MQX Kernel data

bstack (RW): ORIGIN = 0x2000FA00, LENGTH = 0x00000200 # Boot stack end_bstack (RW): ORIGIN = 0x2000FBFF, LENGTH = 0x00000000

fnet_params (RW) : ORIGIN = 0x0007F000,LENGTH = 0x00001000}

KEEP_SECTION { .vectors_rom, .vectors_ram, .cfmconfig }SECTIONS{

__INTERNAL_SRAM_BASE = 0x1FFF0000; __INTERNAL_SRAM_SIZE = 0x00020000;

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Appendix C. Linker command file (.lcf) in CodeWarrior MQX project __INTERNAL_FLASH_BASE = 0x00000000; __INTERNAL_FLASH_SIZE = 0x00080000; __INTERNAL_FLEXNVM_BASE = 0; __INTERNAL_FLEXNVM_SIZE = 0;

__EXTERNAL_MRAM_BASE = 0x70000000; __EXTERNAL_MRAM_SIZE = 0x00080000; __EXTERNAL_MRAM_ROM_BASE = 0x70000000; __EXTERNAL_MRAM_ROM_SIZE = 0x00000000; __EXTERNAL_MRAM_RAM_BASE = 0x70000000; __EXTERNAL_MRAM_RAM_SIZE = 0x00080000; __EXTERNAL_LCD_BASE = 0x60000000; __EXTERNAL_LCD_SIZE = 0x1FFFF;

__EXTERNAL_LCD_DC_BASE = 0x60010000;

# MQX link time configurations __DEFAULT_PROCESSOR_NUMBER = 1;

__DEFAULT_INTERRUPT_STACK_SIZE = 1024;

__KERNEL_DATA_VERIFY_ENABLE = 0; # Test SDRAM read/write

# Flashx configurations

__FLASHX_SECT_SIZE = 0x800;

.vectors : {

__VECTOR_TABLE_ROM_START = .; # Runtime vector table in sram *(.vectors_rom) . = ALIGN (0x4); } > vectorrom

# .cfmprotect : # {

# *(.cfmconfig) # . = ALIGN (0x4); # } > cfmprotrom

.main_application : {

*(KERNEL) *(S_BOOT) *(IPSUM) *(.text) *(.init) *(.fini) *(.eini) *(.ctors) *(.dtors)

. = ALIGN(0x4); *(.rodata)

. = ALIGN(0x4); *(.rdata)

. = ALIGN(0x4); *(.exception) . = ALIGN(0x4);

__exception_table_start__ = .; EXCEPTION

__exception_table_end__ = .; __sinit__ = .; STATICINIT

. = ALIGN(0x4);

__COPY_OF_DATA = .; } > rom

.main_application_data : AT(__COPY_OF_DATA) {

. = ALIGN(0x10000);

__VECTOR_TABLE_RAM_START = .; # Runtime vector table in sram

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Appendix C. Linker command file (.lcf) in CodeWarrior MQX project *(.vectors_ram)

. = ALIGN(512); __BDT_BASE = .; *(.usb_bdt) __BDT_END = .; __START_DATA = .; *(.data)

__END_DATA = .; . = ALIGN(0x4); __START_SDATA = .; *(.sdata)

__END_SDATA = .;

. = ALIGN(0x4); __SDA_BASE = .;

__SDA_BASE_ = __SDA_BASE; . = ALIGN(16); } > ram

.main_application_bss : {

. = ALIGN(0x10); __START_SBSS = .; *(.sbss) *(SCOMMON)

__END_SBSS = .; __START_BSS = .; *(.bss) *(COMMON)

__END_BSS = .; . = ALIGN(16); } >> ram

.kernel_data : #AT(ADDR(.main_application_bss) + SIZEOF(.main_application_bss)) {

__KERNEL_DATA_START = ALIGN(0x10); }

.end_of_kernel_data : {

__KERNEL_DATA_END = .; } > end_of_kd

.boot_stack : {

_stack_end = .; } > bstack

.end_of_boot_stack : {

_stack_addr = .; __SP_INIT = .;

__BOOT_STACK_ADDRESS = .; } > end_bstack

# Locate the ROM copy table into ROM after the initialized data _romp_at = __COPY_OF_DATA + SIZEOF(.main_application_data); .romp : AT (_romp_at) {

__S_romp = _romp_at;

WRITEW(__COPY_OF_DATA); #ROM start address WRITEW(ADDR(.main_application_data)); #RAM start address WRITEW(SIZEOF(.main_application_data)); #size WRITEW(0); WRITEW(0); WRITEW(0);

Ethernet Bootloader for MCU, Rev. 0, 09/2011

Freescale Semiconductor, Inc.

Appendix C. Linker command file (.lcf) in CodeWarrior MQX project }

_flashx_start = __COPY_OF_DATA + SIZEOF(.main_application_data) + SIZEOF(.romp);

# flashx working area spans across the whole rest of Flash memory

__FLASHX_START_ADDR = ((_flashx_start + __FLASHX_SECT_SIZE - 1) / __FLASHX_SECT_SIZE) * __FLASHX_SECT_SIZE;

__FLASHX_END_ADDR = __INTERNAL_FLASH_BASE + __INTERNAL_FLASH_SIZE;}

/* EOF */

Ethernet Bootloader for MCU, Rev. 0, 09/2011

Freescale Semiconductor, Inc.

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Document Number: AN4367Rev. 0, 09/2011

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