From ddb96f1b6533748585591e362579bd4528febd23 Mon Sep 17 00:00:00 2001
From: Amaury Pouly <pamaury@rockbox.org>
Date: Tue, 13 Sep 2011 23:38:45 +0000
Subject: imx233/fuze+: fix ctr0 to use a fresh stack and update firmware
 linker script

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30523 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/target/arm/imx233/app.lds | 23 +++++++++++------------
 firmware/target/arm/imx233/crt0.S  | 11 +++++++----
 2 files changed, 18 insertions(+), 16 deletions(-)

(limited to 'firmware/target')

diff --git a/firmware/target/arm/imx233/app.lds b/firmware/target/arm/imx233/app.lds
index a4fb8af0f1..a961222749 100644
--- a/firmware/target/arm/imx233/app.lds
+++ b/firmware/target/arm/imx233/app.lds
@@ -9,9 +9,6 @@ STARTUP(target/arm/imx233/crt0.o)
 #define PLUGINSIZE PLUGIN_BUFFER_SIZE
 #define CODECSIZE CODEC_SIZE
 
-#define DRAMORIG DRAM_ORIG
-#define IRAMORIG IRAM_ORIG
-
 #define IRAMSIZE IRAM_SIZE
 
 #define DRAMSIZE (DRAM_SIZE - PLUGINSIZE - CODECSIZE - FRAME_SIZE - TTB_SIZE)
@@ -28,26 +25,24 @@ STARTUP(target/arm/imx233/crt0.o)
 
 MEMORY
 {
-    IRAM : ORIGIN = IRAMORIG, LENGTH = IRAMSIZE
+    IRAM : ORIGIN = IRAM_ORIG, LENGTH = IRAMSIZE
     DRAM : ORIGIN = CACHED_DRAM_ADDR, LENGTH = DRAM_SIZE - TTB_SIZE - FRAME_SIZE
-    UNCACHED_DRAM : ORIGIN = UNCACHED_DRAM_ADDR, LENGTH = DRAM_SIZE - TTB_SIZE - FRAME_SIZE
+    UDRAM : ORIGIN = UNCACHED_DRAM_ADDR, LENGTH = DRAM_SIZE - TTB_SIZE - FRAME_SIZE
 }
 
 SECTIONS
 {
+    loadaddress = UNCACHED_DRAM_ADDR;
+    _loadaddress = UNCACHED_DRAM_ADDR;
+        
     .text :
     {
         *(.text*)
-    } > DRAM
-
-    .data :
-    {
         *(.data*)
         *(.rodata*)
-        _dataend = . ;
     } > DRAM
 
-    .iram :
+    .itext :
     {
         _iramstart = .; // always 0
         *(.vectors)
@@ -59,7 +54,7 @@ SECTIONS
         _iramend = .;
     } > IRAM AT> DRAM
 
-    _iramcopy = LOADADDR(.iram);
+    _iramcopy = LOADADDR(.itext);
 
     .ibss (NOLOAD) :
     {
@@ -75,6 +70,7 @@ SECTIONS
         . = ALIGN(4);
         _initstart = .;
         *(.init)
+        . = ALIGN(0x4);
         _initend = .;
     } AT> DRAM
 
@@ -88,6 +84,9 @@ SECTIONS
         stackend = .;
     } > DRAM
 
+    /* physical address of the stack */
+    stackend_phys = stackend - CACHED_DRAM_ADDR + UNCACHED_DRAM_ADDR;
+
     /* treat .bss and .ncbss as a single section */
     .bss (NOLOAD) :
     {
diff --git a/firmware/target/arm/imx233/crt0.S b/firmware/target/arm/imx233/crt0.S
index ab0250f6b6..393411b83a 100644
--- a/firmware/target/arm/imx233/crt0.S
+++ b/firmware/target/arm/imx233/crt0.S
@@ -33,9 +33,9 @@
     ldr     pc, =irq_handler
     ldr     pc, =fiq_handler
 
-/* When starting, we are running at 0x40000000 but the code
- * assumes DRAM is somewhere else (for caching) so we first need to
- * setup the MMU and then jump to the right location */
+/* When starting, we are running at 0x4xxxxxxx (uncached) but the code
+ * assumes DRAM is somewhere else (cached) so we first need to
+ * setup the MMU and then jump to the right location. */
 .text
 .global start
 start:
@@ -49,9 +49,12 @@ start:
     bic     r0, r1
     mcr     p15, 0, r0, c1, c0, 0
 
+    /* To call the C code we need a stack, since the stack is in virtual memory
+     * use the stack's physical address */
+    ldr     sp, =stackend_phys
+
     /* Enable MMU */
     bl      memory_init
-
     /* Jump to real location */
     ldr     pc, =remap
 remap:
-- 
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