Reclaim .iram areas in DRAM by overlapping their load addresses with the uninitialized data sections. I did what I could test out-- not any flash image linker scripts or other target processors. Move any .iram copies in crt0.S's to be the first operation even if not _strictly_ necessary to be emphatic (aka. 'beware').

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20061 a1c6a512-1295-4272-9138-f99709370657

2 files changed, 24 insertions, 21 deletions

diff --git a/firmware/target/sh/archos/app.lds b/firmware/target/sh/archos/app.lds
index 02ed6bef77..225f11f705 100644
--- a/firmware/target/sh/archos/app.lds
+++ b/firmware/target/sh/archos/app.lds
@@ -90,6 +90,7 @@ SECTIONS
     } > IRAM AT> DRAM
 
     _iramcopy = LOADADDR(.iram);
+    _noloaddram = LOADADDR(.iram);
 
     .ibss (NOLOAD) :
     {
@@ -98,18 +99,16 @@ SECTIONS
         . = ALIGN(0x4);
         _iend = .;
     } > IRAM
-
-    /* TRICK ALERT! We want 0x2000 bytes of stack, but we set the section
-       size smaller, and allow the stack to grow into the .iram copy */
-    .stack ADDR(.data) + SIZEOF(.data) + SIZEOF(.iram):
+    
+    .stack _noloaddram (NOLOAD) :
     {
        *(.stack)
-       _stackbegin = . - SIZEOF(.iram);
-       . += 0x2000 - SIZEOF(.iram);
+       _stackbegin = .;
+       . += 0x2000;
        _stackend = .;
     } > DRAM
 
-    .bss :
+    .bss (NOLOAD) :
     {
        _edata = .;
         *(.bss*)
@@ -118,25 +117,26 @@ SECTIONS
        _end = .;
     } > DRAM
 
-    .audiobuf ALIGN(4) :
+    .audiobuf (NOLOAD) :
     {
+    	. = ALIGN(4);
         _audiobuffer = .;
         audiobuffer = .;
     } > DRAM
 
-    .audiobufend ENDAUDIOADDR:
+    .audiobufend ENDAUDIOADDR (NOLOAD) :
     {
         audiobufend = .;
         _audiobufend = .;
     } > DRAM
 
-    .codec ENDAUDIOADDR:
+    .codec ENDAUDIOADDR (NOLOAD) :
     {
         codecbuf = .;
         _codecbuf = .;
     }
 
-    .plugin ENDADDR:
+    .plugin ENDADDR (NOLOAD) :
     {
         _pluginbuf = .;
         pluginbuf = .;
diff --git a/firmware/target/sh/crt0.S b/firmware/target/sh/crt0.S
index a87bee899f..0e8bbfdd68 100644
--- a/firmware/target/sh/crt0.S
+++ b/firmware/target/sh/crt0.S
@@ -98,16 +98,8 @@ start:
     mov     #0,r0
     ldc     r0,gbr
 
-    /* zero out .ibss */
-    mov.l   .iedata_k,r0
-    mov.l   .iend_k,r1
-    bra     .iedatastart
-    mov     #0,r2
-.iedataloop: /* backwards is faster and shorter */
-    mov.l   r2,@-r1
-.iedatastart:
-    cmp/hi  r0,r1
-    bt      .iedataloop
+    /* .iram copy is done first since it is reclaimed for other
+     * uninitialized sections */
 
     /* copy the .iram section */
     mov.l   .iramcopy_k,r0
@@ -127,6 +119,17 @@ start:
     bt      .iramloop
 .noiramcopy:
 
+    /* zero out .ibss */
+    mov.l   .iedata_k,r0
+    mov.l   .iend_k,r1
+    bra     .iedatastart
+    mov     #0,r2
+.iedataloop: /* backwards is faster and shorter */
+    mov.l   r2,@-r1
+.iedatastart:
+    cmp/hi  r0,r1
+    bt      .iedataloop
+
     /* zero out bss */
     mov.l   .edata_k,r0
     mov.l   .end_k,r1