Initial commit

2026-03-29 14:47:13 +02:00
commit b49984b9c0
32 changed files with 2394 additions and 0 deletions
@@ -0,0 +1,100 @@
+/* Linker script for ATSAMD21G17D – with 8KB bootloader (flash starts at 0x2000) */
+
+OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm")
+OUTPUT_ARCH(arm)
+SEARCH_DIR(.)
+
+MEMORY
+{
+  rom (rx)  : ORIGIN = 0x00002000, LENGTH = 0x0001E000  /* 120K (128K - 8K bootloader) */
+  ram (rwx) : ORIGIN = 0x20000000, LENGTH = 0x00004000  /* 16K  */
+}
+
+__StackTop   = ORIGIN(ram) + LENGTH(ram);
+__StackLimit = __StackTop - 0x1000;
+
+SECTIONS
+{
+  .text :
+  {
+    __text_start__ = .;
+    . = ALIGN(4);
+    KEEP(*(.isr_vector))
+    KEEP(*(.vectors .vectors.*))
+    *(.text .text.* .gnu.linkonce.t.*)
+    *(.glue_7t) *(.glue_7)
+    *(.rodata .rodata* .gnu.linkonce.r.*)
+    *(.ARM.extab* .gnu.linkonce.armextab.*)
+
+    . = ALIGN(4);
+    KEEP(*(.init))
+    __preinit_array_start = .;
+    KEEP(*(.preinit_array))
+    __preinit_array_end = .;
+
+    __init_array_start = .;
+    KEEP(*(SORT(.init_array.*)))
+    KEEP(*(.init_array))
+    __init_array_end = .;
+
+    KEEP(*crtbegin.o(.ctors))
+    KEEP(*(EXCLUDE_FILE(*crtend.o) .ctors))
+    KEEP(*(SORT(.ctors.*)))
+    KEEP(*crtend.o(.ctors))
+
+    . = ALIGN(4);
+    KEEP(*(.fini))
+    __fini_array_start = .;
+    KEEP(*(.fini_array))
+    KEEP(*(SORT(.fini_array.*)))
+    __fini_array_end = .;
+
+    KEEP(*crtbegin.o(.dtors))
+    KEEP(*(EXCLUDE_FILE(*crtend.o) .dtors))
+    KEEP(*(SORT(.dtors.*)))
+    KEEP(*crtend.o(.dtors))
+
+    . = ALIGN(4);
+  } > rom
+
+  PROVIDE_HIDDEN(__exidx_start = .);
+  .ARM.exidx :
+  {
+    *(.ARM.exidx* .gnu.linkonce.armexidx.*)
+  } > rom
+  PROVIDE_HIDDEN(__exidx_end = .);
+
+  . = ALIGN(4);
+  __etext = .;
+  _etext  = .;
+
+  .data : AT(__etext)
+  {
+    . = ALIGN(4);
+    __data_start__ = .;
+    _srelocate    = .;
+    *(.ramfunc .ramfunc.*);
+    *(.data .data.*);
+    . = ALIGN(4);
+    __data_end__ = .;
+    _erelocate   = .;
+  } > ram
+
+  .bss (NOLOAD) :
+  {
+    . = ALIGN(4);
+    __bss_start__ = .;
+    _sbss  = .;
+    _szero = .;
+    *(.bss .bss.*)
+    *(COMMON)
+    . = ALIGN(4);
+    __bss_end__ = .;
+    _ebss  = .;
+    _ezero = .;
+  } > ram
+
+  . = ALIGN(4);
+  end  = .;
+  _end = .;
+}
@@ -0,0 +1,108 @@
+/* Linker script for ATSAMD21G17D – no bootloader (flash starts at 0x00000000)
+ *
+ * Symbol names match Arduino SAMD core 1.8.14 (cortex_handlers.c / Reset.cpp):
+ *   __StackTop, __data_start__, __data_end__, __etext,
+ *   __bss_start__, __bss_end__, __text_start__, end
+ */
+
+OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm")
+OUTPUT_ARCH(arm)
+SEARCH_DIR(.)
+
+MEMORY
+{
+  rom    (rx)  : ORIGIN = 0x00000000, LENGTH = 0x0001FE00  /* 127.5K – Firmware */
+  config (rx)  : ORIGIN = 0x0001FE00, LENGTH = 0x00000200  /* 512B   – NVM Config (2 Rows) */
+  ram    (rwx) : ORIGIN = 0x20000000, LENGTH = 0x00004000  /* 16K  */
+}
+
+/* Initial stack pointer = top of RAM */
+__StackTop   = ORIGIN(ram) + LENGTH(ram);   /* 0x20004000 */
+__StackLimit = __StackTop - 0x1000;         /* 4 KB minimum stack */
+
+SECTIONS
+{
+  .text :
+  {
+    __text_start__ = .;
+    . = ALIGN(4);
+    KEEP(*(.isr_vector))
+    KEEP(*(.vectors .vectors.*))
+    *(.text .text.* .gnu.linkonce.t.*)
+    *(.glue_7t) *(.glue_7)
+    *(.rodata .rodata* .gnu.linkonce.r.*)
+    *(.ARM.extab* .gnu.linkonce.armextab.*)
+
+    . = ALIGN(4);
+    KEEP(*(.init))
+    __preinit_array_start = .;
+    KEEP(*(.preinit_array))
+    __preinit_array_end = .;
+
+    __init_array_start = .;
+    KEEP(*(SORT(.init_array.*)))
+    KEEP(*(.init_array))
+    __init_array_end = .;
+
+    KEEP(*crtbegin.o(.ctors))
+    KEEP(*(EXCLUDE_FILE(*crtend.o) .ctors))
+    KEEP(*(SORT(.ctors.*)))
+    KEEP(*crtend.o(.ctors))
+
+    . = ALIGN(4);
+    KEEP(*(.fini))
+    __fini_array_start = .;
+    KEEP(*(.fini_array))
+    KEEP(*(SORT(.fini_array.*)))
+    __fini_array_end = .;
+
+    KEEP(*crtbegin.o(.dtors))
+    KEEP(*(EXCLUDE_FILE(*crtend.o) .dtors))
+    KEEP(*(SORT(.dtors.*)))
+    KEEP(*crtend.o(.dtors))
+
+    . = ALIGN(4);
+  } > rom
+
+  PROVIDE_HIDDEN(__exidx_start = .);
+  .ARM.exidx :
+  {
+    *(.ARM.exidx* .gnu.linkonce.armexidx.*)
+  } > rom
+  PROVIDE_HIDDEN(__exidx_end = .);
+
+  . = ALIGN(4);
+  __etext = .;   /* LMA of .data – where initialized data lives in flash */
+  _etext  = .;   /* legacy alias */
+
+  .data : AT(__etext)
+  {
+    . = ALIGN(4);
+    __data_start__ = .;
+    _srelocate    = .;   /* legacy alias */
+    *(.ramfunc .ramfunc.*);
+    *(.data .data.*);
+    . = ALIGN(4);
+    __data_end__ = .;
+    _erelocate   = .;   /* legacy alias */
+  } > ram
+
+  .bss (NOLOAD) :
+  {
+    . = ALIGN(4);
+    __bss_start__ = .;
+    _sbss  = .;   /* legacy alias */
+    _szero = .;   /* legacy alias */
+    *(.bss .bss.*)
+    *(COMMON)
+    . = ALIGN(4);
+    __bss_end__ = .;
+    _ebss  = .;   /* legacy alias */
+    _ezero = .;   /* legacy alias */
+  } > ram
+
+  /* Heap starts here (used by sbrk / malloc) */
+  . = ALIGN(4);
+  end  = .;
+  _end = .;
+}