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- /* ****************************************************************************************************** */
- /* demo2148_blink_flash.cmd LINKER SCRIPT */
- /* */
- /* */
- /* The Linker Script defines how the code and data emitted by the GNU C compiler and assembler are */
- /* to be loaded into memory (code goes into FLASH, variables go into RAM). */
- /* */
- /* Any symbols defined in the Linker Script are automatically global and available to the rest of the */
- /* program. */
- /* */
- /* To force the linker to use this LINKER SCRIPT, just add the -T demo2148_blink_flash.cmd directive */
- /* to the linker flags in the makefile. */
- /* */
- /* LFLAGS = -Map main.map -nostartfiles -T demo2148_blink_flash.cmd */
- /* */
- /* */
- /* The Philips boot loader supports the ISP (In System Programming) via the serial port and the IAP */
- /* (In Application Programming) for flash programming from within your application. */
- /* */
- /* The boot loader uses RAM memory and we MUST NOT load variables or code in these areas. */
- /* */
- /* RAM used by boot loader: 0x40000120 - 0x400001FF (223 bytes) for ISP variables */
- /* 0x40007FE0 - 0x4000FFFF (32 bytes) for ISP and IAP variables */
- /* 0x40007EE0 - 0x40007FE0 (256 bytes) stack for ISP and IAP */
- /* */
- /* */
- /* MEMORY MAP */
- /* | |0x40008000 */
- /* .-------->|---------------------------------| */
- /* . | variables and stack |0x40007FFF */
- /* ram_isp_high | for Philips boot loader | */
- /* . | 32 + 256 = 288 bytes | */
- /* . | | */
- /* . | Do not put anything here |0x40007EE0 */
- /* .-------->|---------------------------------| */
- /* | UDF Stack 4 bytes |0x40007EDC <---------- _stack_end */
- /* .-------->|---------------------------------| */
- /* | ABT Stack 4 bytes |0x40007ED8 */
- /* .-------->|---------------------------------| */
- /* | FIQ Stack 4 bytes |0x40007ED4 */
- /* .-------->|---------------------------------| */
- /* | IRQ Stack 4 bytes |0x40007ED0 */
- /* .-------->|---------------------------------| */
- /* | SVC Stack 4 bytes |0x40007ECC */
- /* .-------->|---------------------------------| */
- /* . | |0x40007EC8 */
- /* . | stack area for user program | */
- /* . | | | */
- /* . | | | */
- /* . | | | */
- /* . | V | */
- /* . | | */
- /* . | | */
- /* . | | */
- /* . | free ram | */
- /* ram | | */
- /* . | | */
- /* . | | */
- /* . |.................................|0x40000234 <---------- _bss_end */
- /* . | | */
- /* . | .bss uninitialized variables | */
- /* . |.................................|0x40000218 <---------- _bss_start, _edata */
- /* . | | */
- /* . | .data initialized variables | */
- /* . | |0x40000200 <---------- _data */
- /* .-------->|---------------------------------| */
- /* . | variables used by |0x400001FF */
- /* ram_isp_low | Philips boot loader | */
- /* . | 223 bytes |0x40000120 */
- /* .-------->|---------------------------------| */
- /* . | |0x4000011F */
- /* ram_vectors | free ram | */
- /* . |---------------------------------|0x40000040 */
- /* . | |0x4000003F */
- /* . | Interrupt Vectors (re-mapped) | */
- /* . | 64 bytes |0x40000000 */
- /* .-------->|---------------------------------| */
- /* | | */
- /* */
- /* */
- /* */
- /* | | */
- /* .--------> |---------------------------------| */
- /* . | |0x0001FFFF */
- /* . | | */
- /* . | | */
- /* . | | */
- /* . | | */
- /* . | | */
- /* . | unused flash eprom | */
- /* . | | */
- /* . |.................................|0x0000032c */
- /* . | | */
- /* . | copy of .data area | */
- /* flash | | */
- /* . |---------------------------------|0x00000314 <----------- _etext */
- /* . | | */
- /* . | |0x00000180 main */
- /* . | |0x00000278 feed */
- /* . | main() |0x000002c4 FIQ_Routine */
- /* . | |0x000002d8 SWI_Routine */
- /* . | |0x000002ec UNDEF_Routine */
- /* . | |0x000002b0 IRQ_routine */
- /* . |---------------------------------|0x000001cc initialize */
- /* . | |0x000000D4 */
- /* . | Startup Code | */
- /* . | (assembler) | */
- /* . | | */
- /* . |---------------------------------|0x00000040 Reset_Handler */
- /* . | |0x0000003F */
- /* . | Interrupt Vector Table (unused) | */
- /* . | 64 bytes | */
- /* .--------->|---------------------------------|0x00000000 _startup *
- /* */
- /* */
- /* The easy way to prevent the linker from loading anything into a memory area is to define */
- /* a MEMORY region for it and then avoid assigning any .text, .data or .bss sections into it. */
- /* */
- /* */
- /* MEMORY */
- /* { */
- /* ram_isp_low(A) : ORIGIN = 0x40000120, LENGTH = 223 */
- /* */
- /* } */
- /* */
- /* */
- /* Author: James P. Lynch */
- /* */
- /* ****************************************************************************************************** */
- /* identify the Entry Point */
- ENTRY(_startup)
- /* specify the LPC2148 memory areas */
- MEMORY
- {
- flash : ORIGIN = 0, LENGTH = 512K /* FLASH ROM */
- ram_isp_low(A) : ORIGIN = 0x40000120, LENGTH = 223 /* variables used by Philips ISP bootloader */
- ram : ORIGIN = 0x40000200, LENGTH = 32513 /* free RAM area */
- ram_isp_high(A) : ORIGIN = 0x40007FE0, LENGTH = 32 /* variables used by Philips ISP bootloader */
- ram_usb_dma : ORIGIN = 0x7FD00000, LENGTH = 8192 /* on-chip USB DMA RAM area (not used) */
- }
- /* define a global symbol _stack_end */
- _stack_end = 0x40007EDC;
- /* now define the output sections */
- SECTIONS
- {
- . = 0; /* set location counter to address zero */
-
- startup : { *(.startup)} >ram /* the startup code goes into FLASH */
-
-
- .text : /* collect all sections that should go into FLASH after startup */
- {
- *(.text) /* all .text sections (code) */
- *(.rodata) /* all .rodata sections (constants, strings, etc.) */
- *(.rodata*) /* all .rodata* sections (constants, strings, etc.) */
- *(.glue_7) /* all .glue_7 sections (no idea what these are) */
- *(.glue_7t) /* all .glue_7t sections (no idea what these are) */
- _etext = .; /* define a global symbol _etext just after the last code byte */
- } >ram /* put all the above into FLASH */
-
-
- .data : /* collect all initialized .data sections that go into RAM */
- {
- _data = .; /* create a global symbol marking the start of the .data section */
- *(.data) /* all .data sections */
- _edata = .; /* define a global symbol marking the end of the .data section */
- } >ram AT >ram /* put all the above into RAM (but load the LMA copy into FLASH) */
- .bss : /* collect all uninitialized .bss sections that go into RAM */
- {
- _bss_start = .; /* define a global symbol marking the start of the .bss section */
- *(.bss) /* all .bss sections */
- } >ram /* put all the above in RAM (it will be cleared in the startup code */
- . = ALIGN(4); /* advance location counter to the next 32-bit boundary */
- _bss_end = . ; /* define a global symbol marking the end of the .bss section */
- }
- _end = .; /* define a global symbol marking the end of application RAM */
-
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