teensy40: initial implementation

2026-09-08 21:59:06 +00:00 · 2020-09-17 16:09:02 -05:00
parent 163df7670a
commit 691185f5f4
14 changed files with 3017 additions and 21 deletions
@@ -0,0 +1,108 @@
+MEMORY
+{
+  ITCM      (rwx): ORIGIN = 0x00000000, LENGTH = 0x00080000 /*  512 Kib */
+  DTCM      (rwx): ORIGIN = 0x20000000, LENGTH = 0x00080000 /*  512 Kib */
+  RAM       (rwx): ORIGIN = 0x20200000, LENGTH = 0x00080000 /*  512 Kib */
+  FLASH      (rx): ORIGIN = 0x60000000, LENGTH = 0x001FFFF0 /* 1984 Kib */
+}
+
+ENTRY(Reset_Handler);
+
+_stack_size = 128K;
+_heap_size = 512K;
+
+SECTIONS
+{
+  .text : ALIGN(8) {
+
+    FILL(0xFFFFFFFF);
+
+    /* place flash config at beginning of flash device */
+    KEEP(*(.flash_config));
+
+    /* IVT must be located at +4 Kbyte offset from base address of flash. */
+    . = ORIGIN(FLASH) + 0x1000;
+    KEEP(*(.ivt));
+
+    . = ORIGIN(FLASH) + 0x1020;
+    KEEP(*(.boot_data));
+
+    . = ORIGIN(FLASH) + 0x2000;
+
+    _svectors = ABSOLUTE(.);
+    KEEP(*(.isr_vector));
+    . = ALIGN(8);
+
+    *(.text.Reset_Handler);
+    . = ALIGN(8);
+
+    _stext = .;
+    *(.text*);
+    *(.rodata* .constdata*);
+    . = ALIGN(8);
+    _etext = .;
+
+  } > FLASH
+
+  .tinygo_stacksizes : ALIGN(8) {
+
+    *(.tinygo_stacksizes);
+    . = ALIGN(8);
+
+  } > FLASH
+
+  .text.padding (NOLOAD) : {
+
+    . = ALIGN(32768);
+
+  } > ITCM
+
+  .stack (NOLOAD) : {
+
+    . = ALIGN(8);
+    . += _stack_size;
+    _stack_top = .;
+
+  } > DTCM
+
+  .data : ALIGN(8) {
+
+    FILL(0xFFFFFFFF);
+
+    _sdata = .;
+    *(.data*);
+    . = ALIGN(8);
+    _edata = .;
+
+  } > DTCM AT > FLASH
+
+  .bss : ALIGN(8) {
+
+    _sbss = .;
+    *(.bss*);
+    *(COMMON);
+    . = ALIGN(8);
+    _ebss = .;
+
+  } > DTCM AT > DTCM
+
+  /DISCARD/ : {
+
+    *(.ARM.exidx*); /* causes spurious 'undefined reference' errors */
+
+  }
+
+  _sidata = LOADADDR(.data);
+
+  _heap_start = ORIGIN(RAM);
+  _heap_end = ORIGIN(RAM) + LENGTH(RAM);
+
+  _globals_start = _sdata;
+  _globals_end = _ebss;
+
+  _image_size = SIZEOF(.text) + SIZEOF(.tinygo_stacksizes) + SIZEOF(.data);
+
+  /* TODO: link .text to ITCM */
+  _itcm_blocks = (0 + 0x7FFF) >> 15;
+  _flexram_cfg = 0xAAAAAAAA | ((1 << (_itcm_blocks * 2)) - 1);
+}