Sansa AMS: Use IRAM (in app linker script and crt0.S)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19137 a1c6a512-1295-4272-9138-f99709370657

2 files changed, 56 insertions, 17 deletions

diff --git a/firmware/target/arm/as3525/app.lds b/firmware/target/arm/as3525/app.lds
index 08b119e..c2d3ed8 100644
--- a/firmware/target/arm/as3525/app.lds
+++ b/firmware/target/arm/as3525/app.lds
@@ -38,20 +38,11 @@ SECTIONS
 {
     loadaddress = 0x30000000;
 
-    .vectors DRAMORIG :
-    {
-        _vectorstart = .;
-        *(.vectors*);
-        *(.init.text)
-        . = ALIGN(0x4);
-    } > DRAM
-
     .text :
     {
         _textstart = .;
         *(.text)
         *(.text*)
-        *(.icode)
         *(.glue_7)
         *(.glue_7t)
         . = ALIGN(0x4);
@@ -63,14 +54,12 @@ SECTIONS
         *(.rodata*)
         *(.rodata.str1.1)
         *(.rodata.str1.4)
-        *(.irodata*)
         . = ALIGN(0x4);
     } > DRAM
 
     .data :
     {
         *(.data*)
-        *(.idata*)
         . = ALIGN(0x4);
     } > DRAM
 
@@ -93,12 +82,40 @@ SECTIONS
     {
        _edata = .;
         *(.bss*)
-        *(.ibss*)
         *(COMMON)
         . = ALIGN(0x4);
        _end = .;
     } > DRAM
 
+    .vectors IRAMORIG:
+    {
+        _vectors_start = .;
+        *(.init.text)
+    } > IRAM AT > DRAM
+
+    _vectorscopy = LOADADDR(.vectors);
+
+    .ibss (NOLOAD) :
+    {
+        _iedata = .;
+        *(.qharray)
+        *(.ibss)
+        . = ALIGN(0x4);
+        _iend = .;
+    } > IRAM
+
+    .iram _iend :
+    {
+        _iramstart = .;
+        *(.icode)
+        *(.irodata)
+        *(.idata)
+        . = ALIGN(0x4);
+        _iramend = .;
+    } > IRAM AT> DRAM
+
+    _iramcopy = LOADADDR(.iram);
+
     .audiobuf (NOLOAD) :
     {
         . = ALIGN(4);
diff --git a/firmware/target/arm/crt0.S b/firmware/target/arm/crt0.S
index 8290041..35d0aec 100644
--- a/firmware/target/arm/crt0.S
+++ b/firmware/target/arm/crt0.S
@@ -50,22 +50,43 @@ start:
 .word irq_handler
 .word fiq_handler
 
-vectors_end:
+_vectorsend:
 
     .text
 
 newstart:
     msr     cpsr_c, #0xd3 /* enter supervisor mode, disable IRQ/FIQ */
 
-#if CONFIG_CPU==AS3525 && !defined(BOOTLOADER) /* relocate vectors */
+#if CONFIG_CPU==AS3525 && !defined(BOOTLOADER)
+
+    /* relocate vectors */
     mov     r1, #0              @ destination
-    ldr     r2, =start          @ source
-    ldr     r3, =vectors_end    @ end
+    ldr     r2, =_vectorscopy   @ source
+    ldr     r3, =_vectorsend    @ end
 
 1:  ldr     r0, [r2], #4
     str     r0, [r1], #4
-    cmp     r3, r2
+    cmp     r1, r3
     bne     1b
+
+    /* Zero out IBSS */
+    ldr     r2, =_iedata
+    ldr     r3, =_iend
+    mov     r4, #0
+1:
+    cmp     r3, r2
+    strhi   r4, [r2], #4
+    bhi     1b
+
+    /* Copy the IRAM */
+    ldr     r2, =_iramcopy
+    ldr     r3, =_iramstart
+    ldr     r4, =_iramend
+1:
+    cmp     r4, r3
+    ldrhi   r5, [r2], #4
+    strhi   r5, [r3], #4
+    bhi     1b
 #endif
 
     /* Initialise bss section to zero */
@@ -102,6 +123,7 @@ newstart:
 
     /* Switch back to supervisor mode */
     msr     cpsr_c, #0xd3
+
     bl      main