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atsamd: Use local linker script 

Use a local linker script instead of the linker script provided by
Atmel.  This will allow Klipper to use dynamic memory allocation.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2019-03-01 13:25:29 -05:00
parent e18501d01c
commit d33c4820bd
3 changed files with 84 additions and 9 deletions
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16
src/atsamd/Kconfig
View File

@ -53,6 +53,22 @@ config CLOCK_FREQ
default 48000000 if MACH_SAMD21
default 120000000 if MACH_SAMD51
config FLASH_SIZE
hex
default 0x40000 if MACH_SAMD21G18
default 0x80000 if MACH_SAMD51G19 || MACH_SAMD51J19 || MACH_SAMD51N19
default 0x100000 if MACH_SAMD51P20
config RAM_SIZE
hex
default 0x8000 if MACH_SAMD21G18
default 0x30000 if MACH_SAMD51G19 || MACH_SAMD51J19 || MACH_SAMD51N19
default 0x40000 if MACH_SAMD51P20
config STACK_SIZE
int
default 512
choice
prompt "Clock Reference"
config CLOCK_REF_X32K

14
src/atsamd/Makefile
View File

@ -37,17 +37,13 @@ src-$(CONFIG_MACH_SAMD51) += atsamd/samd51_clock.c generic/armcm_timer.c
src-$(CONFIG_MACH_SAMD51) += ../lib/samd51/samd51a/gcc/gcc/startup_samd51.c
# Support bootloader offset address
target-y := $(OUT)samd.ld $(target-y)
target-y := $(target-y)
ldfile-$(CONFIG_MACH_SAMD21G18) := lib/samd21/samd21a/gcc/gcc/samd21g18a_flash.ld
ldfile-$(CONFIG_MACH_SAMD51G19) := lib/samd51/samd51a/gcc/gcc/samd51g19a_flash.ld
ldfile-$(CONFIG_MACH_SAMD51J19) := lib/samd51/samd51a/gcc/gcc/samd51j19a_flash.ld
ldfile-$(CONFIG_MACH_SAMD51N19) := lib/samd51/samd51a/gcc/gcc/samd51n19a_flash.ld
ldfile-$(CONFIG_MACH_SAMD51P20) := lib/samd51/samd51a/gcc/gcc/samd51p20a_flash.ld
$(OUT)samd.ld: $(ldfile-y) $(OUT)board-link
$(OUT)samd.ld: src/atsamd/samd.lds.S $(OUT)board-link
@echo " Preprocessing $@"
$(Q)$(CPP) -P -MD -MT $@ -DFLASH_START=$(CONFIG_FLASH_START) $< -o $@
$(Q)$(CPP) -I$(OUT) -P -MD -MT $@ $< -o $@
$(OUT)klipper.elf: $(OUT)samd.ld
# Build the additional hex and bin output files
target-y += $(OUT)klipper.bin $(OUT)klipper.elf.hex

63
src/atsamd/samd.lds.S Normal file
View File

@ -0,0 +1,63 @@
/* Linker script for atsamd chips
*
* Copyright (C) 2019 Kevin O'Connor <kevin@koconnor.net>
*
* This file may be distributed under the terms of the GNU GPLv3 license.
*/
#include "autoconf.h"
OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm")
OUTPUT_ARCH(arm)
MEMORY
{
rom (rx) : ORIGIN = CONFIG_FLASH_START , LENGTH = CONFIG_FLASH_SIZE
ram (rwx) : ORIGIN = 0x20000000, LENGTH = CONFIG_RAM_SIZE
}
SECTIONS
{
.text : {
. = ALIGN(4);
_sfixed = .;
KEEP(*(.vectors .vectors.*))
*(.text .text.*)
*(.rodata .rodata*)
. = ALIGN(4);
KEEP(*(.init))
. = ALIGN(4);
KEEP(*(.fini))
} > rom
. = ALIGN(4);
_etext = .;
.relocate : AT (_etext)
{
. = ALIGN(4);
_srelocate = .;
*(.ramfunc .ramfunc.*);
*(.data .data.*);
. = ALIGN(4);
_erelocate = .;
} > ram
.bss (NOLOAD) :
{
. = ALIGN(4);
_szero = .;
*(.bss .bss.*)
*(COMMON)
. = ALIGN(4);
_ezero = .;
} > ram
_sstack = 0x20000000 + CONFIG_RAM_SIZE - CONFIG_STACK_SIZE ;
.stack _sstack (NOLOAD) :
{
. = . + CONFIG_STACK_SIZE;
_estack = .;
} > ram
}