Gigabeat S: Place SDMA code load address starting in uninitialized section address and copy it to the plugin buffer since it only needed very early in initialization. Will save about 6K in RAM.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19963 a1c6a512-1295-4272-9138-f99709370657

firmware/target/arm/imx31/app.lds

@@ -91,16 +91,18 @@ SECTIONS
     } AT> DRAM
 
     _vectorscopy = LOADADDR(.vectors);
-
-    .stack :
+    
+    .stack (NOLOAD) :
     {
        *(.stack)
        stackbegin = .;
        . += 0x2000;
        stackend = .;
     } > DRAM
+    
+    _sdmacodecopy = stackbegin;
 
-    .bss :
+    .bss (NOLOAD) :
     {
        _edata = .;
         *(.bss*)
@@ -110,30 +112,38 @@ SECTIONS
        _end = .;
     } > DRAM
 
-    .audiobuf ALIGN(4) :
+    .audiobuf (NOLOAD) :
     {
+    	. = ALIGN(0x4);
         _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 = .;
     }
     
+    .sdma _pluginbuf : AT( _sdmacodecopy )
+    {
+    	_sdmacodestart = .;
+    	*(.sdmacode);
+    	_sdmacodeend = .;
+    }
+    
     .devbss (NOLOAD) :
     {
     	_devbssdata = .;

firmware/target/arm/imx31/crt0.S

@@ -231,6 +231,26 @@ remap_end:
     bhi     1b
 #endif /* BOOTLOADER */
 
+#ifndef BOOTLOADER
+    /* Copy discardable SDMA code - loaded in the stack section
+     * and so must be done first. Destination is the plugin buffer
+     * which is safe when SDMA init takes place just after kernel
+     * init. */
+    ldr     r4, =_sdmacodecopy
+    ldr     r3, =_sdmacodeend
+    ldr     r2, =_sdmacodestart
+1:
+    cmp     r3, r2
+    ldrhi   r5, [r4], #4
+    strhi   r5, [r2], #4
+    bhi     1b
+
+    /* Make buffer coherent */
+    ldr     r0, =_sdmacodestart
+    sub     r1, r3, r0
+    bl      clean_dcache_range
+#endif /* BOOTLOADER */
+
     /* Initialise bss section to zero */
     ldr     r2, =_edata
     ldr     r3, =_end

firmware/target/arm/imx31/sdma_script_code.h

@@ -356,7 +356,8 @@
 /*!
  * Code download for i.MX system revision = 1.0
  */
-static __attribute__((aligned(4))) const short sdma_code_1[RAM_CODE_SIZE_1] =
+static __attribute__((aligned(4), section(".sdmacode")))
+    const short sdma_code_1[RAM_CODE_SIZE_1] =
 {
 	0xc0ec, 0x7d59, 0x0970, 0x0111, 0x5111, 0x5ad1, 0x5bd9, 0xc0fe,
 	0x5ce1, 0x7d02, 0x0200, 0x9806, 0x08ff, 0x0011, 0x28ff, 0x00bc,
@@ -851,7 +852,8 @@ static __attribute__((aligned(4))) const short sdma_code_1[RAM_CODE_SIZE_1] =
 /*!
  * Code download for i.MX system revision > 1.0
  */
-static __attribute__((aligned(4))) const short sdma_code_2[RAM_CODE_SIZE_2] =
+static __attribute__((aligned(4), section(".sdmacode")))
+    const short sdma_code_2[RAM_CODE_SIZE_2] =
 {
     0x0870, 0x0011, 0x5010, 0xc0ec, 0x7d61, 0x5ac0, 0x5bc8, 0x5ef8,
     0xc0fe, 0x56f8, 0x7d02, 0x0200, 0x9806, 0x6ec3, 0x6d07, 0x5df0,