From 82ecc75e68ee3edc22514c8a33aa7774e02fd4d4 Mon Sep 17 00:00:00 2001
From: Amaury Pouly <pamaury@rockbox.org>
Date: Sat, 2 Jul 2011 02:12:10 +0000
Subject: imx233/fuze+: make config.h more correct, remove logo from
 bootloader, update linker file and crt0 to produce a single blob into dram

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30111 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/target/arm/imx233/boot.lds | 51 +++++++++++++++++--------------------
 firmware/target/arm/imx233/crt0.S   | 37 ++++++++++++++++++++++++---
 2 files changed, 56 insertions(+), 32 deletions(-)

(limited to 'firmware/target/arm')

diff --git a/firmware/target/arm/imx233/boot.lds b/firmware/target/arm/imx233/boot.lds
index 39e570a03e..cb925b055e 100644
--- a/firmware/target/arm/imx233/boot.lds
+++ b/firmware/target/arm/imx233/boot.lds
@@ -14,32 +14,6 @@ MEMORY
 
 SECTIONS
 {
-    .vectors 0 :
-    {
-        *(.vectors);
-        . = ALIGN(0x4);
-    } > IRAM
-
-    .itext :
-    {
-        *(.icode)
-        *(.init.text)
-        . = ALIGN(0x4);
-    } > IRAM
-
-    .idata :
-    {
-        *(.qharray)
-        *(.idata)
-        *(.irodata)
-        . = ALIGN(0x4);
-    } > IRAM
-
-    .ibss :
-    {
-        *(.ibss)
-    } > IRAM
-
     .text :
     {
         *(.text*)
@@ -52,13 +26,34 @@ SECTIONS
         _dataend = . ;
     } > DRAM
 
+    .iram :
+    {
+        _iramstart = .; // always 0
+        *(.vectors)
+        KEEP(*(.vectors));// otherwise there are no reference to it and the linker strip it
+        *(.icode)
+        *(.irodata)
+        *(.idata)
+        . = ALIGN(0x4);
+        _iramend = .;
+    } > IRAM AT> DRAM
+
+    _iramcopy = LOADADDR(.iram);
+
+    .ibss (NOLOAD) :
+    {
+        _iedata = .;
+        *(.qharray)
+        *(.ibss)
+        . = ALIGN(0x4);
+        _iend = .;
+    } > IRAM
+
     .stack (NOLOAD) :
     {
         *(.stack)
-        _stackbegin = .;
         stackbegin = .;
         . += 0x2000;
-        _stackend = .;
         stackend = .;
     } > DRAM
 
diff --git a/firmware/target/arm/imx233/crt0.S b/firmware/target/arm/imx233/crt0.S
index 836c3e88cb..e233d439e0 100644
--- a/firmware/target/arm/imx233/crt0.S
+++ b/firmware/target/arm/imx233/crt0.S
@@ -23,10 +23,8 @@
 
 .section .vectors,"ax",%progbits
 .code 32
-.global start
-start:
     /* most handlers are in DRAM which is too far away for a relative jump */
-    ldr     pc, =newstart
+    ldr     pc, =start
     ldr     pc, =undef_instr_handler
     ldr     pc, =software_int_handler
     ldr     pc, =prefetch_abort_handler
@@ -36,8 +34,39 @@ start:
     ldr     pc, =fiq_handler
 
 .text
-newstart:
+.global start
+start:
     msr     cpsr_c, #0xd3 /* enter supervisor mode, disable IRQ/FIQ */
+    /* 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 */
+    /* must be done before bss is zeroed */
+    ldr     r2, =_iramcopy
+    ldr     r3, =_iramstart
+    ldr     r4, =_iramend
+1:
+    cmp     r4, r3
+    ldrhi   r5, [r2], #4
+    strhi   r5, [r3], #4
+    bhi     1b
+
+    /* Initialise bss section to zero */
+    ldr     r2, =_edata
+    ldr     r3, =_end
+    mov     r4, #0
+1:
+    cmp     r3, r2
+    strhi   r4, [r2], #4
+    bhi     1b
+
+
     /* Set up some stack and munge it with 0xdeadbeef */
     ldr     sp, =stackend
     ldr     r2, =stackbegin
-- 
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