Podsumowanie

Implementacja ethernetowego bootloadera jest możliwa dla trzech różnych scenariuszy:

• W projekcie programistycznym napisanym w środowisku IAR
• W projekcie programistycznym napisanym w środowisku CodeWarrior
• W projekcie programistycznym napisanym w środowisku CodeWarrior i wykorzystującym system operacyjny MQX.

Każdy scenariusz został przybliżony w formie opisu, w którym zawarto kroki, jakie należy wykonać, aby zintegrować w oprogramowaniu użytkownika funkcjonalność ethernetowego bootloadera. Dostępność różnych scenariuszy umożliwia projektantom wybranie spośród nich najlepszego dla swojego projektu.

Dodatek A: plik konfiguracji linkera (.icf) dla środowiska IAR

Listing 12.

/*###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); //FAPP
define 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};
initialize 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 }; //APP
place in ROM_region { readonly, block CodeRelocate};
place in RAM_region { readwrite, block CodeRelocateRam,
block CSTACK, block HEAP };

Dodatek B: plik rozkazów linkera (.lcf) dla środowiska CW

Listing 13.

# 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) ;
__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;
}