DM320: Update boot linker script (right now it is linked against flash). Include board initialization for M:Robe 500.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29225 a1c6a512-1295-4272-9138-f99709370657

3 files changed, 407 insertions, 66 deletions

diff --git a/firmware/SOURCES b/firmware/SOURCES
index 303c080c97..ae0c8a4f20 100644
--- a/firmware/SOURCES
+++ b/firmware/SOURCES
@@ -1003,6 +1003,7 @@ target/arm/ata-as-arm.S
 target/arm/lcd-as-memframe.S
 #endif
 target/arm/mmu-arm.S
+target/arm/tms320dm320/mrobe-500/crt0-board.S
 target/arm/tms320dm320/mrobe-500/adc-mr500.c
 target/arm/tms320dm320/mrobe-500/ata-mr500.c
 target/arm/tms320dm320/mrobe-500/backlight-mr500.c
diff --git a/firmware/target/arm/tms320dm320/boot.lds b/firmware/target/arm/tms320dm320/boot.lds
index 11fc79c24a..2b9f345a23 100644
--- a/firmware/target/arm/tms320dm320/boot.lds
+++ b/firmware/target/arm/tms320dm320/boot.lds
@@ -1,6 +1,6 @@
 #include "config.h"
 
-ENTRY(start)
+ENTRY(_vectors)
 
 OUTPUT_FORMAT(elf32-littlearm)
 OUTPUT_ARCH(arm)
@@ -27,15 +27,19 @@ STARTUP(target/arm/tms320dm320/crt0.o)
  */
 #define LCD_TTB_AREA    0x100000*((LCD_BUFFER_SIZE>>19)+1)
 
-#define BOOT_OFFSET     0x1000000
+/* Bootloader only uses/knows about the upper 32 M */
+#define DRAMORIG    0x02900000
+#define DRAMSIZE    (MEMORYSIZE * 0x80000)
 
-#define DRAMSIZE (MEMORYSIZE * 0x100000) - BOOT_OFFSET
-
-#define DRAMORIG    (0x00900000+BOOT_OFFSET) /* actually it's 0x00900000 */
 #define IRAMORIG    0x00000000
 #define IRAMSIZE    0x4000
+
 #define FLASHORIG   0x00100000
-#define FLASHSIZE   8M
+#define FLASHSIZE   0x00800000
+
+PRO_STACK_SIZE =  0x2000;
+IRQ_STACK_SIZE =  0x400;
+FIQ_STACK_SIZE =  0x400;
 
 /* End of the audio buffer, where the codec buffer starts */
 #define TTB_BEGIN   (DRAMORIG + DRAMSIZE - LCD_TTB_AREA)
@@ -49,98 +53,121 @@ MEMORY
 
 SECTIONS
 {
-    . = DRAMORIG;
+    /* Set up variables needed for memory initialization */
+    _sdram_start    = DRAMORIG;
+    _sdram_sizem    = (DRAMSIZE / 0x100000);
+
+    _flash_start    = FLASHORIG;
+    _flash_sizem    = (FLASHSIZE / 0x100000);
+
+    .vectors :
+    {
+        _vectorsstart = .;
+        KEEP(*(.vectors))
+        _vectorsend = .;
+    } > IRAM AT> FLASH
+    _vectorscopy = LOADADDR(.vectors);
 
-    .text : {
-        loadaddress = .;
+    /* crt0.S initialization */
+    .init :
+    {
+        . = ALIGN(0x4);
         _loadaddress = .;
-        *(.init.text)
-        *(.text*)
-        *(.glue_7)
-        *(.glue_7t)
+        *(.init)
+    } > FLASH
+
+    /* Program code */
+    .text :
+    {
         . = ALIGN(0x4);
-    } > DRAM
+        *(.text*)
+    } > FLASH
 
+    /* Thumb interworking sections - for some reason LD dies even if these
+     * sections are empty.
+     */
+    .glue :
+    {
+       . = ALIGN(0x4);
+       *(.glue_7)  /* ARM calling Thumb */
+       *(.glue_7t) /* Thumb calling ARM */
+    } > FLASH
+
+    /* Read-only data */
     .rodata :
     {
-        *(.rodata)  /* problems without this, dunno why */
-        *(.rodata*)
-        *(.rodata.str1.1)
-        *(.rodata.str1.4)
         . = ALIGN(0x4);
+        *(.rodata*)
+    } > FLASH
 
-        /* Pseudo-allocate the copies of the data sections */
-        _datacopy = .;
-    } > DRAM
-
-    .data : {
+    /* Dynamic data - this needs to be copied out of flash before it is used. */
+    .data :
+    {
+        . = ALIGN(0x4);
+        _dramstart = .;
         *(.data*)
+        _dramend = .;
+    } > DRAM AT> FLASH
+    _dramcopy = LOADADDR(.data);
+
+        .bss (NOLOAD) :
+    {
         . = ALIGN(0x4);
-        _dataend = . ;
+        _bss_start = .;
+        *(.bss*)
+        *(COMMON)
+        _bss_end = .;
     } > DRAM
 
-    .vectors IRAMORIG :
-    {
-        _vectorsstart = .;
-        KEEP(*(.resetvectors));
-        *(.resetvectors);
-        KEEP(*(.vectors));
-        *(.vectors);
-        _vectorsend = .;
-    } > IRAM AT > DRAM
-    _vectorscopy = LOADADDR(.vectors);
-    
     .iram :
     {
+        . = ALIGN(0x4);
         _iramstart = .;
         *(.icode)
-        *(.irodata*)
+        *(.irodata)
         *(.idata)
-        . = ALIGN(0x4);
         _iramend = .;
-    } > IRAM AT> DRAM
+    } > IRAM AT> FLASH
 
     _iramcopy = LOADADDR(.iram);
     
     .ibss (NOLOAD) :
     {
-        _iedata = .;
-        *(.ibss)
         . = ALIGN(0x4);
-        _iend = .;
+        _ibss_start = .;
+        *(.ibss)
+        _ibss_end = .;
     } > IRAM
 
-    .stack (NOLOAD) :
-    {
-         *(.stack)
-         stackbegin = .;
-         . += 0x2000;
-         stackend = .;
-    } > IRAM
-    
-    .irqstack (NOLOAD) :
+    /* Program stack space */
+    .pro_stack (NOLOAD): 
     {
-       *(.stack)
-       . += 0x400;
-       irq_stack = .;
+        . = ALIGN(0x4);
+        *(.stack)
+        stackbegin = .;        /* Variable for thread.c */
+        _pro_stack_end = .;       
+        . += PRO_STACK_SIZE;
+        _pro_stack_start = .;
+        stackend = .;          /* Variable for tread.c */
     } > IRAM
-    
-    .fiqstack (NOLOAD) :
+
+    /* IRQ stack space */
+    .irq_stack (NOLOAD):
     {
-       *(.stack)
-       . += 0x100;
-       fiq_stack = .;
+        . = ALIGN(0x4);
+        _irq_stack_end = .;
+        . += IRQ_STACK_SIZE;
+        _irq_stack_start = .;
     } > IRAM
-    
-        .bss (NOLOAD) :
+
+    /* FIQ stack space */
+    .fiq_stack (NOLOAD):
     {
-        . = ADDR(.data) + SIZEOF(.data) + SIZEOF(.vectors) + SIZEOF(.iram);
-        _edata = .;
-        *(.bss*)
-        *(COMMON)
         . = ALIGN(0x4);
-        _end = .;
-    } > DRAM
+        _fiq_stack_end = .;
+        . += FIQ_STACK_SIZE;
+        _fiq_stack_start = .;
+    } > IRAM
     
     .ttbtable TTB_BEGIN (NOLOAD) :
     {
diff --git a/firmware/target/arm/tms320dm320/mrobe-500/crt0-board.S b/firmware/target/arm/tms320dm320/mrobe-500/crt0-board.S
new file mode 100644
index 0000000000..ace04df847
--- /dev/null
+++ b/firmware/target/arm/tms320dm320/mrobe-500/crt0-board.S
@@ -0,0 +1,313 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id: $
+ *
+ * Copyright (C) 2010 by Karl Kurbjun
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "config.h"
+#include "cpu.h"
+
+#define  SDRAM_MODE     0x9B00
+
+/* Macro for reading a register */
+.macro mrh  register
+    ldr     r1, =\register
+    ldrh    r0, [r1]
+.endm
+
+/* Macro for writing a register */
+.macro mwh  register, value
+    ldr     r0, =\value
+    ldr     r1, =\register
+    strh    r0, [r1]
+.endm
+
+/* This version uses a mov to save on the literal pool size. Otherwise it is
+ *  functionally equivalent.
+ */
+.macro mwhm register, value
+    mov     r0, #\value
+    ldr     r1, =\register
+    strh    r0, [r1]
+.endm
+
+/******************************************************************************
+ * _init_board:                                                               *
+ *    This function initializes the specific baord this SoC is on.            *
+ ******************************************************************************/
+.section    .init, "ax"
+.code       32
+.align      0x04
+.global     _init_board
+.type       _init_board, %function
+
+_init_board:
+
+    /* Setup the EMIF interface timings */
+
+    /* FLASH interface:
+     * These are based on the OF setup 
+     */
+    /* IO_EMIF_CS0CTRL1 and
+     * IO_EMIF_CS0CTRL2 
+     */
+    mwh     0x30A00, 0x4488
+    mwh     0x30A02, 0x1220
+
+    /* ATA interface:
+     * These are based on the OF setup 
+     */
+    /* IO_EMIF_CS3CTRL1 and
+     * IO_EMIF_CS3CTRL2 
+     */
+    mwh     0x30A10, 0x77EF
+    mwh     0x30A12, 0x5220
+
+    /* USB interface:
+    * The following EMIF timing values are from the OF:
+    *      IO_EMIF_CS4CTRL1 = 0x66AB;
+    *      IO_EMIF_CS4CTRL2 = 0x4220;
+    *
+    * More agressive numbers may be possible, but it depends on the clocking
+    *  setup. 
+    */
+    /* IO_EMIF_CS4CTRL1 and
+     * IO_EMIF_CS4CTRL2
+     */
+    mwh     0x30A14, 0x66AB
+    mwh     0x30A16, 0x4220
+
+    /* IO_EMIF_BUSCTRL */
+    mwh     0x30A18, 0x0001
+
+_clock_setup:
+    /* Clock initialization */
+    /* Used for ES10 and unknown, slower clocks, but also uses more power
+    *  due to PLL setup and slow ARM clock speed.
+    */
+
+    /* IO_CLK_BYP: Bypass the PLLs for the following changes */
+    mwh 0x30894, 0x1111
+
+    /* 27 MHz input clock:
+    *  IO_CLK_PLLA = 27 * 11 / 1 = 297 MHz
+    *  IO_CLK_PLLB = 27 * 13 / 1 = 351 MHz
+    */
+    mwh 0x30880, 0x10A0
+    mwh 0x30882, 0x10C0
+
+    /* IO_CLK_SEL0: VLNQ is fed by PLLB, I2C from M48XI, MS from PLLA */
+    mwh 0x30884, 0x17E
+
+    /* IO_CLK_SEL1: VENC = MXI CLK, PLLA, PCLK, nodiv2 */
+    mwhm 0x30886, 0x1000
+
+    # IO_CLK_SEL2: ARM and AXL are from PLLB, SDRAM and DSP are PLLA */
+    mwh 0x30888, 0x1001
+
+    /* IO_CLK_DIV0: Set the slow clock speed for the ARM/AHB
+     * Slow Setup:
+     *  ARM div  = 4    ( 87.5 MHz )
+     *  AHB div  = 1    ( 87.5 MHz )
+     */
+    mwh 0x3088A, 0x0003 /* OF sets this to 0x0103 */
+
+    /* IO_CLK_DIV1:
+     * SDRAM div= 3     ( 99   MHz )
+     * AXL div  = 2     ( 175  MHz )
+     */
+    mwh 0x3088C, 0x0102 /* OF sets this to 0x0103 */
+
+    /* IO_CLK_DIV2:
+     * MS div   = 32    ( ~9  MHz )
+     * DSP div  = 3     ( 99  MHz )
+     */ 
+    mwh 0x3088E, 0x020E
+
+    /* IO_CLK_DIV3: (this comment is incorrect, (31 << 8) | 255;)
+     * MMC div  = 256   ( slow )
+     * VENC div = 32    ( 843.75 KHz )
+     */
+    mwhm 0x30890, 0x0003
+
+    /* IO_CLK_DIV4: (this comment is incorrect, (31 << 8) | 0;)
+     * I2C div  = 1     (48 MHz if M48XI is running)
+     * VLNQ div = 32
+     */
+    mwhm 0x30892, 0x0200
+
+    # PLLA &= ~0x1000 (BIC #0x1000)
+    mrh     0x30880
+    bic     r0, r0, #0x1000
+    strh    r0, [r1]
+
+    # PLLB &= ~0x1000
+    mrh     0x30882
+    bic     r0, r0, #0x1000
+    strh    r0, [r1]
+
+    /* Wait for PLLs to lock before feeding them to the downstream devices */
+_plla_wait:
+    mrh     0x30880
+    bic     r0, r0, #0x7F
+    tst     r0, r0
+    beq     _plla_wait
+
+_pllb_wait:
+    mrh     0x30882
+    bic     r0, r0, #0x7F
+    tst     r0, r0
+    beq     _plla_wait
+
+    /* IO_CLK_BYP: Enable PLL feeds */
+    mwhm 0x30894, 0x0
+
+    /* IO_CLK_MOD0: Most off */
+    mwh 0x30898, 0x0167
+
+    /* IO_CLK_MOD1: All off */
+    mwhm 0x3089A, 0x0
+
+    /* IO_CLK_MOD2: Turn on the GPIO clock */
+    mwhm 0x3089C, 0x20
+
+    /* Setup the SDRAM range on the AHB bus */
+    /* SDRAMSA */
+    mov    r0, #0x60000
+    mov    r1, #0x900000
+    str    r1, [r0, #0xF00]
+    
+    /* SDRAMEA: 64MB */
+    mov    r1, #0x4900000
+    str    r1, [r0, #0xF04]
+    
+    /* BUSCTRL */
+    mov    r1, #0x00000
+    str    r1, [r0, #0xF08]
+    
+    /* USBCTRL */
+    str    r1, [r0, #0xF20]
+
+    /* Setup IO_SDRAM_SDMODE based on OF */
+    mov    r1, #0x00030000
+    orr    r1, r1, #0x900
+
+    /* Pre-charge all banks */
+    ldr    r0, =(SDRAM_MODE | 0x82)
+    strh   r0, [r1, #0xA6]
+
+    /* Setup auto refresh, OF uses 0x5F */
+    ldr    r0, =0x140
+    strh   r0, [r1, #0xA8]
+
+    /* Issue 8 auto refresh cycles */
+    ldr    r0, =(SDRAM_MODE | 0x84)
+    strh   r0, [r1, #0xA6]
+    strh   r0, [r1, #0xA6]
+    strh   r0, [r1, #0xA6]
+    strh   r0, [r1, #0xA6]
+    strh   r0, [r1, #0xA6]
+    strh   r0, [r1, #0xA6]
+    strh   r0, [r1, #0xA6]
+    strh   r0, [r1, #0xA6]
+    
+    /* Set the mode register */
+    ldr    r0, =(SDRAM_MODE | 0x81)
+    strh   r0, [r1, #0xA6]
+    
+    /* Go back to the NOP state */
+    ldr    r0, =(SDRAM_MODE | 0x80)
+    strh   r0, [r1, #0xA6]
+    
+    /* Turn on auto power down */
+    ldr    r0, =(SDRAM_MODE | 0x40)
+    strh   r0, [r1, #0xA6]
+
+    /* Go through the GPIO initialization */
+    /* IO_GIO_FSEL0: Set up the GPIO pin functions 0-16 */
+    mwh     0x305A4, 0x0000
+
+    /* IO_GIO_FSEL1: 17-24 */
+    mwh     0x305A6, 0x0000
+
+    /* IO_GIO_FSEL2: 18-32 */
+    mwh     0x305A8, 0x1450
+
+    /* IO_GIO_FSEL3: 33-40 */
+    mwh     0x305AA, 0x0404
+
+    /* IO_GIO_DIR0 */
+    mwh     0x30580, 0x6A0B
+
+    /* IO_GIO_DIR1: Important note - pin 26 has control over the system power.
+     *  If this pin is not initialized the device will shut off immediately.
+     */
+    mwh     0x30582, 0x8B00
+
+    /* IO_GIO_DIR2 */
+    mwh     0x30584, 0x0000
+    
+    /* IO_GIO_INV0 */
+    mwh     0x30586, 0x0000
+
+    /* IO_GIO_INV1 */
+    mwh     0x30588, 0x0000
+
+    /* IO_GIO_INV2 */
+    mwh     0x3058A, 0x0000
+
+    /* IO_GIO_BITCLR0 */
+    mwh     0x30592, 0xFFFF
+
+    /* IO_GIO_BITCLR1 */
+    mwh     0x30594, 0xFFFF
+
+    /* IO_GIO_BITCLR2 */
+    mwh     0x30596, 0xFFFF
+
+    /* IO_GIO_BITSET0 */
+    mwh     0x3058C, 0x0280
+   
+    /* IO_GIO_BITSET1 */
+    mwh     0x3058E, 0x2066
+   
+    /* IO_GIO_BITSET2 */
+    mwh     0x30590, 0x0025
+
+    /* IO_GIO_IRQPORT */
+    mwh     0x30598, 0xD60B
+
+    /* IO_GIO_IRQEDGE */
+    mwh     0x3059A, 0x0801
+
+    /* IO_GIO_CHAT0 */
+    mwh     0x3059C, 0x0000
+
+    /* IO_GIO_CHAT1 */
+    mwh     0x3059E, 0x0000
+
+    /* IO_GIO_CHAT2 */
+    mwh     0x305A0, 0x0000
+
+    /* IO_GIO_NCHAT */
+    mwh     0x305A2, 0x0000
+
+    bx     lr
+
+.ltorg  
+.size       _init_board, .-_init_board
+