circuitpython/atmel-samd/boards/samd21x18-bootloader.ld
Scott Shawcroft 0c4f9b878a Enable REPL over USB.
All of the code was there except the linker was failing to clear the bss section because I added too many .zeros. The should have only been the exported globals that start with _ like _szero = .. Fixing that and turn on the usb transmit fixed everything.
2016-08-24 00:14:11 -07:00

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/*
GNU linker script for SAMD21
*/
/* Specify the memory areas */
MEMORY
{
FLASH (rx) : ORIGIN = 0x00000000+0x2000, LENGTH = 0x00040000-0x2000 /* Leave 8KiB for the bootloader. */
RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 0x008000 /* 32 KiB */
}
/* top end of the stack */
_estack = ORIGIN(RAM) + LENGTH(RAM);
/* define output sections */
SECTIONS
{
/* The program code and other data goes into FLASH */
.text :
{
. = ALIGN(4);
_sfixed = .;
KEEP(*(.vectors)) /* isr vector table */
*(.text) /* .text sections (code) */
*(.text*) /* .text* sections (code) */
*(.rodata) /* .rodata sections (constants, strings, etc.) */
*(.rodata*) /* .rodata* sections (constants, strings, etc.) */
. = ALIGN(4);
_etext = .; /* define a global symbol at end of code */
_sidata = _etext; /* This is used by the startup in order to initialize the .data secion */
} >FLASH
/* This is the initialized data section
The program executes knowing that the data is in the RAM
but the loader puts the initial values in the FLASH (inidata).
It is one task of the startup to copy the initial values from FLASH to RAM. */
.data : AT ( _sidata )
{
. = ALIGN(4);
_srelocate = .; /* create a global symbol at data start; used by startup code in order to initialise the .data section in RAM */
*(.ramfunc)
*(.ramfunc*)
*(.data) /* .data sections */
*(.data*) /* .data* sections */
. = ALIGN(4);
_erelocate = .; /* define a global symbol at data end; used by startup code in order to initialise the .data section in RAM */
} >RAM
/* Uninitialized data section */
.bss :
{
. = ALIGN(4);
_sbss = .;
_szero = .; /* define a global symbol at bss start; used by startup code */
*(.bss)
*(.bss*)
*(COMMON)
. = ALIGN(4);
_ezero = .; /* define a global symbol at bss end; used by startup code */
_ebss = .;
} >RAM
.ARM.attributes 0 : { *(.ARM.attributes) }
}