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

1 files changed, 13 insertions, 10 deletions

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