preparation for running directly from flash ROM

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@4283 a1c6a512-1295-4272-9138-f99709370657

2 files changed, 23 insertions, 0 deletions

diff --git a/firmware/app.lds b/firmware/app.lds
index 83a09a81d0..bacc645044 100644
--- a/firmware/app.lds
+++ b/firmware/app.lds
@@ -117,6 +117,10 @@ SECTIONS
     .data :
     {
         *(.data)
+        . = ALIGN(0x4);
+        _datacopy = .; /* dummy here, only for ROM based */
+        _datastart = .;
+        _dataend  = .;
     } > DRAM
 
     .rodata :
diff --git a/firmware/crt0.S b/firmware/crt0.S
index 99aab83867..088ea0aff4 100644
--- a/firmware/crt0.S
+++ b/firmware/crt0.S
@@ -112,6 +112,19 @@ copy_l:
         bf      copy_l
         nop
 
+        /* copy the .data section, for rombased execution */
+        mov.l   datacopy_k,r0
+        mov.l   data_k,r1
+        mov.l   dataend_k,r2
+copy_l2:
+        mov.l   @r0,r3
+        mov.l   r3,@r1
+        add     #4,r0
+        add     #4,r1
+        cmp/ge  r2,r1
+        bf      copy_l2
+        nop
+
         /* Munge the main thread stack */
         mov.l   stack_k,r2
         mov.l   deadbeef_k,r0
@@ -150,6 +163,12 @@ iram_k:
         .long   _iramstart
 iramend_k:
         .long   _iramend
+datacopy_k:
+        .long   _datacopy
+data_k:
+        .long   _datastart
+dataend_k:
+        .long   _dataend
 main_k:
         .long   _main
 vbr_k: