altos/lpc: Add boot loader

[fw/altos] / src / lpc / altos.ld

diff --git a/src/lpc/altos.ld b/src/lpc/altos.ld
index 4d6f35a82a32b83574fffa1730dea574d853d9c4..00d4f18a67e275645f9cd34cbe4fcce669199994 100644 (file)
--- a/src/lpc/altos.ld
+++ b/src/lpc/altos.ld
@@ -16,7 +16,7 @@
  */
 
 MEMORY {
-       rom (rx) : ORIGIN = 0x00000000, LENGTH = 32K
+       rom (rx) : ORIGIN = 0x00001000, LENGTH = 28K
        ram (!w) : ORIGIN = 0x10000000, LENGTH = 4K - 128
        usb (!x) : ORIGIN = 0x20004000 + 2K - 256, LENGTH = 256
        stack (!w) : ORIGIN = 0x10000000 + 4K - 128, LENGTH = 128
@@ -31,11 +31,15 @@ SECTIONS {
         * Rom contents
         */
 
-       .text ORIGIN(rom) : {
-               __text_start__ = .;
+       .interrupt ORIGIN(ram) : AT (ORIGIN(rom)) {
+               __interrupt_start__ = .;
+               __interrupt_rom__ = ORIGIN(rom);
                *(.interrupt)   /* Interrupt vectors */
+               __interrupt_end__ = .;
+       } > ram
 
-               . = ORIGIN(rom) + 0x100;
+       .text ORIGIN(rom) + 0x100 : {
+               __text_start__ = .;
 
                ao_romconfig.o(.romconfig*)
                ao_product.o(.romconfig*)
@@ -50,9 +54,20 @@ SECTIONS {
                __text_end__ = .;
        } > rom
 
+       /* Boot data which must live at the start of ram so that
+        * the application and bootloader share the same addresses.
+        * This must be all uninitialized data
+        */
+       .boot : {
+               __boot_start__ = .;
+               *(.boot)
+               . = ALIGN(4);
+               __boot_end__ = .;
+       } >ram
+
        /* Data -- relocated to RAM, but written to ROM
         */
-       .data ORIGIN(ram) : AT (ADDR(.ARM.exidx) + SIZEOF (.ARM.exidx)) {
+       .data : AT (ADDR(.ARM.exidx) + SIZEOF (.ARM.exidx)) {
                __data_start__ = .;
                *(.data)        /* initialized data */
                __data_end__ = .;
@@ -60,6 +75,7 @@ SECTIONS {
        } >ram
 
        .bss : {
+               __bss_start__ = .;
                *(.bss)
                *(COMMON)
                __bss_end__ = .;