From 4633446517c002ed81cdbbc6acb9b8ffd9becc85 Mon Sep 17 00:00:00 2001
From: Thomas Martitz <kugel@rockbox.org>
Date: Wed, 20 May 2009 21:09:53 +0000
Subject: Sansa AMS: Centralise mapping of RAM and IRAM in as3525.h via
 #defines. This will hopefully make ongoing mmu work easier as less places
 need to be changed.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21000 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/export/as3525.h            | 18 +++++++++++++++++
 firmware/target/arm/as3525/app.lds  | 40 ++++++++++++++++---------------------
 firmware/target/arm/as3525/boot.lds | 10 +++++++---
 3 files changed, 42 insertions(+), 26 deletions(-)

(limited to 'firmware')

diff --git a/firmware/export/as3525.h b/firmware/export/as3525.h
index 388df2a925..326a7610bb 100644
--- a/firmware/export/as3525.h
+++ b/firmware/export/as3525.h
@@ -22,10 +22,28 @@
 
 #define UART_CHANNELS 1
 
+
+#if MEMORYSIZE <= 2
+/* we put the codec buffer in IRAM */
+#define AMS_LOWMEM
+#endif
+/* these addresses are valid after mapping through the MMU */
+#define DRAM_ORIG 0x30000000
+#define IRAM_ORIG 0x0
+
+#define DRAM_SIZE (MEMORYSIZE * 0x100000)
+#define IRAM_SIZE 0x50000
+
+
 /* AS352X only supports 512 Byte HW ECC */
 #define ECCSIZE 512
 #define ECCBYTES 3
 
+/* AS352X MMU Page Table Entries */
+/* to be implemented */
+#define TTB_SIZE                  0x0           /* Mimics OF  */
+#define TTB_BASE_ADDR             (DRAM_ORIG + DRAM_SIZE - TTB_SIZE)
+
 
 /* AS352X device base addresses */
 
diff --git a/firmware/target/arm/as3525/app.lds b/firmware/target/arm/as3525/app.lds
index 7f37cc5d7c..45ae30f9f3 100644
--- a/firmware/target/arm/as3525/app.lds
+++ b/firmware/target/arm/as3525/app.lds
@@ -1,4 +1,5 @@
 #include "config.h"
+#include "cpu.h"
 
 ENTRY(start)
 
@@ -6,11 +7,6 @@ OUTPUT_FORMAT(elf32-littlearm)
 OUTPUT_ARCH(arm)
 STARTUP(target/arm/crt0.o)
 
-#if MEMORYSIZE <= 2
-/* we put the codec buffer in IRAM */
-#define LOWMEM
-#endif
-
 #define PLUGINSIZE PLUGIN_BUFFER_SIZE
 #define CODECSIZE CODEC_SIZE
 
@@ -20,26 +16,27 @@ STARTUP(target/arm/crt0.o)
 #define STUBOFFSET 0
 #endif
 
-#include "cpu.h"
 
-#ifdef LOWMEM
-#define DRAMSIZE (MEMORYSIZE * 0x100000) - STUBOFFSET - PLUGINSIZE
-#define CODECORIG (IRAMORIG + 0x50000 - CODEC_SIZE)
-#define IRAMSIZE (0x50000 - CODEC_SIZE)
+#define IRAMORIG IRAM_ORIG
+#define DRAMORIG (DRAM_ORIG + STUBOFFSET)
+
+/* End of the audio buffer, where the codec buffer starts */
+#define ENDAUDIOADDR  (DRAMORIG + DRAMSIZE)
+
+
+#ifdef AMS_LOWMEM
+#define DRAMSIZE (DRAM_SIZE - STUBOFFSET - PLUGINSIZE - TTB_SIZE)
+#define CODECORIG (IRAMORIG + (IRAM_SIZE - CODEC_SIZE))
+#define IRAMSIZE (IRAM_SIZE - CODEC_SIZE)
 #else
-#define DRAMSIZE (MEMORYSIZE * 0x100000) - STUBOFFSET - PLUGINSIZE - CODECSIZE
+#define DRAMSIZE (DRAM_SIZE - STUBOFFSET - PLUGINSIZE - CODECSIZE - TTB_SIZE)
 #define CODECORIG (ENDAUDIOADDR)
 #define IRAMSIZE (0x20000)
 #endif
 
-#define IRAMORIG 0x0
-#define DRAMORIG 0x30000000 + STUBOFFSET
-
-/* End of the audio buffer, where the codec buffer starts */
-#define ENDAUDIOADDR  (DRAMORIG + DRAMSIZE)
 
 /* Where the codec buffer ends, and the plugin buffer starts */
-#ifdef LOWMEM
+#ifdef AMS_LOWMEM
 #define ENDADDR (ENDAUDIOADDR)
 #else
 #define ENDADDR (ENDAUDIOADDR + CODECSIZE)
@@ -47,7 +44,7 @@ STARTUP(target/arm/crt0.o)
 
 MEMORY
 {
-#ifdef LOWMEM
+#ifdef AMS_LOWMEM
     CODEC_IRAM : ORIGIN = CODECORIG, LENGTH = CODEC_SIZE
 #endif
     IRAM : ORIGIN = IRAMORIG, LENGTH = IRAMSIZE
@@ -56,7 +53,7 @@ MEMORY
 
 SECTIONS
 {
-    loadaddress = 0x30000000;
+    loadaddress = DRAM_ORIG;
 
     .text :
     {
@@ -71,10 +68,7 @@ SECTIONS
 
     .rodata :
     {
-        *(.rodata)  /* problems without this, dunno why */
         *(.rodata*)
-        *(.rodata.str1.1)
-        *(.rodata.str1.4)
         . = ALIGN(0x4);
     } > DRAM
 
@@ -152,7 +146,7 @@ SECTIONS
     {
         codecbuf = .;
         _codecbuf = .;
-#ifdef LOWMEM
+#ifdef AMS_LOWMEM
     } > CODEC_IRAM
 #else
     } > DRAM
diff --git a/firmware/target/arm/as3525/boot.lds b/firmware/target/arm/as3525/boot.lds
index 7a13d67a43..a98763e8f6 100644
--- a/firmware/target/arm/as3525/boot.lds
+++ b/firmware/target/arm/as3525/boot.lds
@@ -1,18 +1,22 @@
 #include "config.h"
+#include "cpu.h"
 
 ENTRY(start)
 OUTPUT_FORMAT(elf32-littlearm)
 OUTPUT_ARCH(arm)
 STARTUP(target/arm/crt0.o)
 
-#define DRAMSIZE (MEMORYSIZE * 0x100000)
+/*
+No need for DRAM in our bootloader
+#define DRAMSIZE (MEMORYSIZE * 0x100000) - TTB_SIZE
 #define DRAMORIG 0x30000000
-#define IRAMORIG 0
+*/
+#define IRAMORIG 0x81000000
 #define IRAMSIZE 0x50000
 
 MEMORY
 {
-    DRAM : ORIGIN = DRAMORIG, LENGTH = DRAMSIZE
+    /*DRAM : ORIGIN = DRAMORIG, LENGTH = DRAMSIZE*/
     IRAM : ORIGIN = IRAMORIG, LENGTH = IRAMSIZE
 }
 
-- 
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