Clean up crt0.S and move it to the target tree

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@10830 a1c6a512-1295-4272-9138-f99709370657

4 files changed, 1081 insertions, 0 deletions

diff --git a/firmware/target/arm/crt0-pp.S b/firmware/target/arm/crt0-pp.S
new file mode 100644
index 0000000000..d847d9d943
--- /dev/null
+++ b/firmware/target/arm/crt0-pp.S
@@ -0,0 +1,375 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Linus Nielsen Feltzing
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "config.h"
+#include "cpu.h"
+
+    .section .init.text,"ax",%progbits
+
+    .global    start
+start:
+
+/* PortalPlayer bootloader and startup code based on startup.s from the iPodLinux 
+ * loader
+ *
+ * Copyright (c) 2003, Daniel Palffy (dpalffy (at) rainstorm.org)
+ * Copyright (c) 2005, Bernard Leach <leachbj@bouncycastle.org>
+ *
+ */
+#if CONFIG_CPU == PP5002
+    .equ    PROC_ID,  0xc4000000
+    .equ    COP_CTRL, 0xcf004058
+    .equ    COP_STATUS, 0xcf004050
+    .equ    IIS_CONFIG, 0xc0002500
+    .equ    SLEEP,    0xca
+    .equ    WAKE,     0xce
+    .equ    SLEEPING, 0x4000
+#else
+    .equ    PROC_ID,  0x60000000
+    .equ    COP_CTRL, 0x60007004
+    .equ    COP_STATUS, 0x60007004
+    .equ    IIS_CONFIG, 0x70002800
+    .equ    SLEEP,    0x80000000
+    .equ    WAKE,     0x0
+    .equ    SLEEPING, 0x80000000
+#endif
+
+    msr    cpsr_c, #0xd3 /* enter supervisor mode, disable IRQ */
+
+#ifndef BOOTLOADER
+    b      pad_skip
+.space 50*4 /* (more than enough) space for exception vectors */
+pad_skip:
+    /* We need to remap memory from wherever SDRAM is mapped natively, to
+       base address 0, so we can put our exception vectors there. We don't
+       want to do this remapping while executing from SDRAM, so we copy the
+       remapping code to IRAM, then execute from there. Hence, the following
+       code is compiled for address 0, but is currently executing at either
+       0x28000000 or 0x10000000, depending on chipset version. Do not use any
+       absolute addresses until remapping has been done. */
+    ldr    r1, =0x40000000
+    ldr    r2, =remap_start
+    ldr    r3, =remap_end
+
+    and    r5, pc, #0xff000000 /* adjust for execute address */
+    orr    r2, r2, r5
+    orr    r3, r3, r5
+
+    /* copy the code to 0x40000000 */
+1:
+    ldr    r4, [r2], #4
+    str    r4, [r1], #4
+    cmp    r2, r3
+    ble    1b
+
+    ldr    r3, =0x3f84     /* r3 and r1 values here are magic, don't touch */
+    orr    r3, r3, r5      /* adjust for execute address */
+    ldr    r2, =0xf000f014
+    mov    r1, #0x3a00
+    ldr    r0, =0xf000f010
+    mov    pc, #0x40000000 
+
+remap_start:
+    str    r1, [r0]
+    str    r3, [r2]
+    ldr    r0, L_post_remap
+    mov    pc, r0
+L_post_remap: .word remap_end
+remap_end:
+
+    /* After doing the remapping, send the COP to sleep.
+       On wakeup it will go to cop_init */
+    ldr    r0, =PROC_ID
+    ldr    r0, [r0]
+    and    r0, r0, #0xff
+    cmp    r0, #0x55
+    beq    1f
+    
+    /* put us (co-processor) to sleep */
+    ldr    r4, =COP_CTRL
+    mov    r3, #SLEEP
+    str    r3, [r4]
+
+    ldr    pc, =cop_init
+
+1:
+
+#ifndef DEBUG
+    /* Copy exception handler code to address 0 */
+    ldr    r2, =_vectorsstart
+    ldr    r3, =_vectorsend
+    ldr    r4, =_vectorscopy
+1:
+    cmp    r3, r2
+    ldrhi  r5, [r4], #4
+    strhi  r5, [r2], #4
+    bhi    1b
+#else
+    ldr    r1, =vectors
+    ldr    r0, =irq_handler
+    str    r0, [r1, #24]
+    ldr    r0, =fiq_handler
+    str    r0, [r1, #28]
+#endif
+    
+#ifndef STUB
+    /* 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 */
+    ldr    r2, =_iramcopy
+    ldr    r3, =_iramstart
+    ldr    r4, =_iramend
+1:
+    cmp    r4, r3
+    ldrhi  r5, [r2], #4
+    strhi  r5, [r3], #4
+    bhi    1b
+#endif /* !STUB */
+#endif /* !BOOTLOADER */
+
+    /* 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
+    mov    r3, sp
+    ldr    r2, =stackbegin
+    ldr    r4, =0xdeadbeef
+1:
+    cmp    r3, r2
+    strhi  r4, [r2], #4
+    bhi    1b
+
+#ifdef BOOTLOADER
+    /* TODO: the high part of the address is probably dependent on CONFIG_CPU.
+       Since we tend to use ifdefs for each chipset target
+       anyway, we might as well just hardcode it here.
+     */
+       
+    /* get the high part of our execute address */
+    ldr    r0, =0xff000000
+    and    r8, pc, r0             @ r8 is used later
+
+    /* Find out which processor we are */
+    mov    r0, #PROC_ID
+    ldr    r0, [r0]
+    and    r0, r0, #0xff
+    cmp    r0, #0x55
+    beq    1f
+
+    /* put us (co-processor) to sleep */
+    ldr    r4, =COP_CTRL
+    mov    r3, #SLEEP
+    str    r3, [r4]
+    ldr    pc, =cop_wake_start
+
+cop_wake_start:
+    /* jump the COP to startup */
+    ldr    r0, =startup_loc
+    ldr    pc, [r0]
+
+1:
+    
+    /* get the high part of our execute address */
+    ldr    r2, =0xffffff00
+    and    r4, pc, r2
+
+    /* Copy bootloader to safe area - 0x40000000 */
+    mov    r5, #0x40000000
+    ldr    r6, = _dataend
+    sub    r0, r6, r5       /* length of loader */
+    add    r0, r4, r0     /* r0 points to start of loader */
+1:
+    cmp    r5, r6
+    ldrcc  r2, [r4], #4
+    strcc  r2, [r5], #4
+    bcc    1b
+
+    ldr    pc, =start_loc    /* jump to the relocated start_loc:  */
+    
+start_loc:
+
+    /* execute the loader - this will load an image to 0x10000000 */
+    bl     main
+
+    /* Wake up the coprocessor before executing the firmware */
+
+    /* save the startup address for the COP */
+    ldr    r1, =startup_loc
+    str    r0, [r1]
+
+    /* make sure COP is sleeping */
+    ldr    r4, =COP_STATUS
+1:
+    ldr    r3, [r4]
+    ands   r3, r3, #SLEEPING
+    beq    1b
+
+    /* wake up COP */
+    ldr    r4, =COP_CTRL
+    mov    r3, #WAKE
+    str    r3, [r4]
+
+    /* jump to start location */
+    mov    pc, r0
+
+startup_loc:
+    .word    0x0
+
+.align 8    /* starts at 0x100 */
+.global boot_table
+boot_table:
+    /* here comes the boot table, don't move its offset */
+    .space 400
+
+#else /* BOOTLOADER */
+    
+    /* Set up stack for IRQ mode */ 
+    msr    cpsr_c, #0xd2
+    ldr    sp, =irq_stack
+    /* Set up stack for FIQ mode */ 
+    msr    cpsr_c, #0xd1
+    ldr    sp, =fiq_stack
+    /* We'll load the banked FIQ mode registers with useful values here.
+       These values will be used in the FIQ handler in pcm_playback.c */
+    ldr    r12, =IIS_CONFIG
+
+    ldr    r11, =p
+
+    /* Let abort and undefined modes use IRQ stack */
+    msr    cpsr_c, #0xd7
+    ldr    sp, =irq_stack
+    msr    cpsr_c, #0xdb
+    ldr    sp, =irq_stack
+    /* Switch to supervisor mode */
+    msr    cpsr_c, #0xd3
+    ldr    sp, =stackend
+    bl     main
+    /* main() should never return */
+
+cop_init:
+    ldr    sp, =cop_stackend
+    mov    r3, sp
+    ldr    r2, =cop_stackbegin
+    ldr    r4, =0xdeadbeef
+2:
+    cmp    r3, r2
+    strhi  r4, [r2], #4
+    bhi    2b
+
+    ldr    sp, =cop_stackend
+    bl     cop_main
+    
+/* Exception handlers. Will be copied to address 0 after memory remapping */
+    .section .vectors,"aw"
+    ldr    pc, [pc, #24]
+    ldr    pc, [pc, #24]
+    ldr    pc, [pc, #24]
+    ldr    pc, [pc, #24]
+    ldr    pc, [pc, #24]
+    ldr    pc, [pc, #24]
+    ldr    pc, [pc, #24]
+    ldr    pc, [pc, #24]
+
+    /* Exception vectors */
+    .global vectors
+vectors:
+    .word  start 
+    .word  undef_instr_handler
+    .word  software_int_handler
+    .word  prefetch_abort_handler
+    .word  data_abort_handler
+    .word  reserved_handler
+    .word  irq_handler
+    .word  fiq_handler
+
+    .text
+
+#ifndef STUB
+    .global irq
+    .global fiq
+    .global UIE
+#endif
+
+/* All illegal exceptions call into UIE with exception address as first
+   parameter. This is calculated differently depending on which exception
+   we're in. Second parameter is exception number, used for a string lookup
+   in UIE.
+ */
+undef_instr_handler:
+    mov    r0, lr
+    mov    r1, #0
+    b      UIE
+
+/* We run supervisor mode most of the time, and should never see a software
+   exception being thrown. Perhaps make it illegal and call UIE?
+ */
+software_int_handler:
+reserved_handler:
+    movs   pc, lr
+
+prefetch_abort_handler:
+    sub    r0, lr, #4
+    mov    r1, #1
+    b      UIE
+
+fiq_handler:
+    @ Branch straight to FIQ handler in pcm_playback.c. This also handles the
+    @ the correct return sequence.
+    ldr    pc, =fiq
+
+data_abort_handler:
+    sub    r0, lr, #8 
+    mov    r1, #2
+    b      UIE
+
+irq_handler:
+#ifndef STUB
+    stmfd  sp!, {r0-r3, r12, lr}
+    bl     irq
+    ldmfd  sp!, {r0-r3, r12, lr}
+#endif
+    subs   pc, lr, #4
+
+#ifdef STUB
+UIE:
+    b UIE
+#endif
+
+/* 256 words of IRQ stack */
+    .space 256*4
+irq_stack:
+
+/* 256 words of FIQ stack */
+    .space 256*4
+fiq_stack:
+
+#endif /* BOOTLOADER */ 
diff --git a/firmware/target/arm/crt0.S b/firmware/target/arm/crt0.S
new file mode 100644
index 0000000000..82b7c31f92
--- /dev/null
+++ b/firmware/target/arm/crt0.S
@@ -0,0 +1,232 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Linus Nielsen Feltzing
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "config.h"
+#include "cpu.h"
+
+    .section .init.text,"ax",%progbits
+
+    .global    start
+start:
+
+/* Arm bootloader and startup code based on startup.s from the iPodLinux loader
+ *
+ * Copyright (c) 2003, Daniel Palffy (dpalffy (at) rainstorm.org)
+ * Copyright (c) 2005, Bernard Leach <leachbj@bouncycastle.org>
+ *
+ */
+
+    msr    cpsr_c, #0xd3 /* enter supervisor mode, disable IRQ */
+
+#ifndef BOOTLOADER
+#if CONFIG_CPU == PNX0101
+
+#ifndef DEBUG
+    ldr    r0, =0x80105000
+    mov    r1, #1
+    str    r1, [r0, #4]
+    mov    r1, #0
+    str    r1, [r0, #4]
+1:  ldr    r1, [r0]
+    cmp    r1, #0
+    bne    1b
+    mov    r1, #0x74
+    str    r1, [r0, #8]
+    mov    r1, #2
+    str    r1, [r0, #0x18]	
+    mov    r1, #0x120
+    str    r1, [r0, #0x30]
+    mov    r1, #6
+    str    r1, [r0, #4]
+    ldr    r0, =1f
+    mov    r15, r0
+1:
+#endif /* !DEBUG */
+#endif /* chipset specific */
+
+#ifndef DEBUG
+    /* Copy exception handler code to address 0 */
+    ldr    r2, =_vectorsstart
+    ldr    r3, =_vectorsend
+    ldr    r4, =_vectorscopy
+1:
+    cmp    r3, r2
+    ldrhi  r5, [r4], #4
+    strhi  r5, [r2], #4
+    bhi    1b
+#else
+    ldr    r1, =vectors
+    ldr    r0, =irq_handler
+    str    r0, [r1, #24]
+    ldr    r0, =fiq_handler
+    str    r0, [r1, #28]
+#endif
+    
+#ifndef STUB
+    /* 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 */
+    ldr    r2, =_iramcopy
+    ldr    r3, =_iramstart
+    ldr    r4, =_iramend
+1:
+    cmp    r4, r3
+    ldrhi  r5, [r2], #4
+    strhi  r5, [r3], #4
+    bhi    1b
+#endif /* !STUB */
+#endif /* !BOOTLOADER */
+
+    /* 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
+    mov    r3, sp
+    ldr    r2, =stackbegin
+    ldr    r4, =0xdeadbeef
+1:
+    cmp    r3, r2
+    strhi  r4, [r2], #4
+    bhi    1b
+
+#ifdef BOOTLOADER
+/* Code for ARM bootloader targets other than iPod go here */
+
+#if CONFIG_CPU == S3C2440
+    bl main
+#endif
+
+#else /* BOOTLOADER */
+    
+    /* Set up stack for IRQ mode */ 
+    msr    cpsr_c, #0xd2
+    ldr    sp, =irq_stack
+    /* Set up stack for FIQ mode */ 
+    msr    cpsr_c, #0xd1
+    ldr    sp, =fiq_stack
+
+    /* Let abort and undefined modes use IRQ stack */
+    msr    cpsr_c, #0xd7
+    ldr    sp, =irq_stack
+    msr    cpsr_c, #0xdb
+    ldr    sp, =irq_stack
+    /* Switch to supervisor mode */
+    msr    cpsr_c, #0xd3
+    ldr    sp, =stackend
+    bl     main
+    /* main() should never return */
+   
+/* Exception handlers. Will be copied to address 0 after memory remapping */
+    .section .vectors,"aw"
+    ldr    pc, [pc, #24]
+    ldr    pc, [pc, #24]
+    ldr    pc, [pc, #24]
+    ldr    pc, [pc, #24]
+    ldr    pc, [pc, #24]
+    ldr    pc, [pc, #24]
+    ldr    pc, [pc, #24]
+    ldr    pc, [pc, #24]
+
+    /* Exception vectors */
+    .global vectors
+vectors:
+    .word  start 
+    .word  undef_instr_handler
+    .word  software_int_handler
+    .word  prefetch_abort_handler
+    .word  data_abort_handler
+    .word  reserved_handler
+    .word  irq_handler
+    .word  fiq_handler
+
+    .text
+
+#ifndef STUB
+    .global irq
+    .global fiq
+    .global UIE
+#endif
+
+/* All illegal exceptions call into UIE with exception address as first
+   parameter. This is calculated differently depending on which exception
+   we're in. Second parameter is exception number, used for a string lookup
+   in UIE.
+ */
+undef_instr_handler:
+    mov    r0, lr
+    mov    r1, #0
+    b      UIE
+
+/* We run supervisor mode most of the time, and should never see a software
+   exception being thrown. Perhaps make it illegal and call UIE?
+ */
+software_int_handler:
+reserved_handler:
+    movs   pc, lr
+
+prefetch_abort_handler:
+    sub    r0, lr, #4
+    mov    r1, #1
+    b      UIE
+
+fiq_handler:
+    @ Branch straight to FIQ handler in pcm_playback.c. This also handles the
+    @ the correct return sequence.
+    ldr    pc, =fiq
+
+data_abort_handler:
+    sub    r0, lr, #8 
+    mov    r1, #2
+    b      UIE
+
+irq_handler:
+#ifndef STUB
+    stmfd  sp!, {r0-r3, r12, lr}
+    bl     irq
+    ldmfd  sp!, {r0-r3, r12, lr}
+#endif
+    subs   pc, lr, #4
+
+#ifdef STUB
+UIE:
+    b UIE
+#endif
+
+/* 256 words of IRQ stack */
+    .space 256*4
+irq_stack:
+
+/* 256 words of FIQ stack */
+    .space 256*4
+fiq_stack:
+
+#endif /* BOOTLOADER */ 
diff --git a/firmware/target/coldfire/crt0.S b/firmware/target/coldfire/crt0.S
new file mode 100644
index 0000000000..a0e948486e
--- /dev/null
+++ b/firmware/target/coldfire/crt0.S
@@ -0,0 +1,260 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Linus Nielsen Feltzing
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "config.h"
+#include "cpu.h"
+
+    .section .init.text,"ax",@progbits
+
+    .global    start
+start:
+
+    move.w  #0x2700,%sr
+
+    move.l  #vectors,%d0
+    movec.l %d0,%vbr
+        
+    move.l  #MBAR+1,%d0
+    movec.l %d0,%mbar
+        
+    move.l  #MBAR2+1,%d0
+    movec.l %d0,%mbar2
+
+    lea     MBAR,%a0
+    lea     MBAR2,%a1
+        
+    clr.l  (0x180,%a1)  /* PLLCR = 0 */
+
+    /* 64K DMA-capable SRAM at 0x10000000
+       DMA is enabled and has priority in both banks
+       All types of accesses are allowed
+       (We might want to restrict that to save power) */
+    move.l  #0x10000e01,%d0
+    movec.l %d0,%rambar1
+
+    /* 32K Non-DMA SRAM at 0x10010000
+       All types of accesses are allowed
+       (We might want to restrict that to save power) */
+    move.l  #0x10010001,%d0
+    movec.l %d0,%rambar0
+
+    /* Chip select 0 - Flash ROM */
+    moveq.l #0x00,%d0      /* CSAR0 - Base = 0x00000000 */
+    move.l  %d0,(0x080,%a0)
+    move.l  #FLASH_SIZE-0x10000+1,%d0 /* CSMR0 - All access */
+    move.l  %d0,(0x084,%a0)
+    move.l  #0x00000180,%d0 /* CSCR0 - no wait states, 16 bits, no bursts */
+    move.l  %d0,(0x088,%a0)
+        
+    /* Chip select 1 - LCD controller */
+    move.l  #0xf0000000,%d0 /* CSAR1 - Base = 0xf0000000 */
+    move.l  %d0,(0x08c,%a0)
+    moveq.l #0x1,%d0        /* CSMR1 - 64K */
+    move.l  %d0,(0x090,%a0)
+    move.l  #0x00000180,%d0 /* CSCR1 - no wait states, 16 bits, no bursts */
+    move.l  %d0,(0x094,%a0)
+        
+    /* Chip select 2 - ATA controller */
+    move.l  #0x20000000,%d0 /* CSAR2 - Base = 0x20000000 */
+    move.l  %d0,(0x098,%a0)
+    move.l  #0x000f0001,%d0 /* CSMR2 - 64K, Only data access */
+    move.l  %d0,(0x09c,%a0)
+    move.l  #0x00000080,%d0 /* CSCR2 - no wait states, 16 bits, no bursts */
+    move.l  %d0,(0x0a0,%a0) /* NOTE:  I'm not sure about the wait states.
+                               We have to be careful with the access times,
+                               since IORDY isn't connected to the HDD. */
+
+#if CONFIG_USBOTG == USBOTG_ISP1362
+    /* Chip select 3 - USBOTG controller */
+    move.l  #0xc0000000,%d0 /* CSAR3 - Base = 0xc0000000 */
+    move.l  %d0,(0x0a4,%a0)
+    moveq.l #0x1,%d0        /* CSMR3 - 64K */
+    move.l  %d0,(0x0a8,%a0)
+    move.l  #0x00000180,%d0 /* CSCR3 - no wait states, 16 bits, no bursts */
+    move.l  %d0,(0x0ac,%a0)
+#endif
+
+#ifdef BOOTLOADER
+    /* Check if original firmware is still present */
+    lea     0x00001000,%a2
+    move.l  (%a2),%d0
+    move.l  #0xfbfbfbf1,%d1
+    cmp.l   %d0,%d1
+    beq.b   .ignorecookie
+    
+    /* The cookie is not reset. This must mean that the boot loader
+       has crashed. Let's start the original firmware immediately. */
+    lea     0x10017ffc,%a2
+    move.l  (%a2),%d0
+    move.l  #0xc0015a17,%d1
+    cmp.l   %d0,%d1
+    bne.b   .nocookie
+    /* Clear the cookie again */
+    clr.l   (%a2)
+    jmp     8
+        
+.nocookie:
+    /* Set the cookie */
+    move.l  %d1,(%a2)
+.ignorecookie:
+
+    /* Set up the DRAM controller. The refresh is based on the 11.2896MHz
+       clock (5.6448MHz bus frequency). We haven't yet started the PLL */
+#if MEM < 32
+    move.w  #0x8004,%d0 /* DCR - Synchronous, 80 cycle refresh */
+#else
+    move.w  #0x8001,%d0 /* DCR - Synchronous, 32 cycle refresh */
+#endif
+    move.w  %d0,(0x100,%a0)
+
+    /* Note on 32Mbyte models:
+       We place the SDRAM on an 0x1000000 (16M) offset because
+       the 5249 BGA chip has a fault which disables the use of A24. The
+       suggested workaround by FreeScale is to offset the base address by
+       half the DRAM size and increase the mask to the double.
+       In our case this means that we set the base address 16M ahead and
+       use a 64M mask.
+    */
+#if MEM < 32
+    move.l  #0x31002324,%d0 /* DACR0 - Base 0x31000000, Banks on 21 and up,
+                               CAS latency 1, Page mode, No refresh yet */
+    move.l  %d0,(0x108,%a0)
+    move.l  #0x00fc0001,%d0 /* Size: 16M */
+    move.l  %d0,(0x10c,%a0) /* DMR0 - 32Mb */
+#else
+    move.l  #0x31002524,%d0 /* DACR0 - Base 0x31000000, Banks on 23 and up,
+                               CAS latency 1, Page mode, No refresh yet */
+    move.l  %d0,(0x108,%a0)
+    move.l  #0x03fc0001,%d0 /* Size: 64M because of workaround above */
+    move.l  %d0,(0x10c,%a0) /* DMR0 - 32Mb */
+#endif
+
+    /* Precharge */
+    moveq.l #8,%d0
+    or.l    %d0,(0x108,%a0) /* DACR0[IP] = 1, next access will issue a
+                               Precharge command */
+    move.l  #0xabcd1234,%d0
+    move.l  %d0,0x31000000  /* Issue precharge command */
+
+    move.l  #0x8000,%d0
+    or.l    %d0,(0x108,%a0) /* Enable refresh */
+
+    /* Let it refresh */
+    move.l  #500,%d0
+.delayloop:
+    subq.l  #1,%d0
+    bne.b   .delayloop
+
+    /* Mode Register init */
+    moveq.l #0x40,%d0       /* DACR0[IMRS] = 1, next access will set the
+                               Mode Register */
+    or.l    %d0,(0x108,%a0)
+
+    move.l  #0xabcd1234,%d0
+    move.l  %d0,0x31000800  /* A12=1 means CASL=1 (a0 is not connected) */
+
+    /* DACR0[IMRS] gets deactivated by the SDRAM controller */
+#endif /* BOOTLOADER */
+
+    /* Invalicate cache */
+    move.l  #0x01000000,%d0
+    movec.l %d0,%cacr
+        
+    /* Enable cache, default=non-cacheable,no buffered writes */
+    move.l  #0x80000000,%d0
+    movec.l %d0,%cacr
+
+    /* Cache enabled in SDRAM only, buffered writes enabled */
+    move.l  #0x3103c020,%d0
+    movec.l %d0,%acr0
+    moveq.l #0,%d0
+    movec.l %d0,%acr1
+
+#ifndef BOOTLOADER
+    /* zero out .ibss */
+    lea     _iedata,%a2
+    lea     _iend,%a4
+    bra.b   .iedatastart
+.iedataloop:
+    clr.l   (%a2)+
+.iedatastart:
+    cmp.l   %a2,%a4
+    bhi.b   .iedataloop
+
+    /* copy the .iram section */
+    lea     _iramcopy,%a2
+    lea     _iramstart,%a3
+    lea     _iramend,%a4
+    bra.b   .iramstart
+.iramloop:
+    move.l  (%a2)+,(%a3)+
+.iramstart:
+    cmp.l   %a3,%a4
+    bhi.b   .iramloop
+#endif /* !BOOTLOADER */
+
+#ifdef IRIVER_H300_SERIES
+    /* Set KEEP_ACT before doing the lengthy copy and zero-fill operations */
+    move.l #0x00080000,%d0
+    or.l %d0,(0xb4,%a1)
+    or.l %d0,(0xb8,%a1)
+    or.l %d0,(0xbc,%a1)
+#endif
+
+    /* zero out bss */
+    lea     _edata,%a2
+    lea     _end,%a4
+    bra.b   .edatastart
+.edataloop:
+    clr.l   (%a2)+
+.edatastart:
+    cmp.l   %a2,%a4
+    bhi.b   .edataloop
+
+    /* copy the .data section */
+    lea     _datacopy,%a2
+    lea     _datastart,%a3
+    cmp.l   %a2,%a3
+    beq.b   .nodatacopy   /* Don't copy if src and dest are equal */
+    lea     _dataend,%a4
+    bra.b   .datastart
+.dataloop:
+    move.l  (%a2)+,(%a3)+
+.datastart:
+    cmp.l   %a3,%a4
+    bhi.b   .dataloop
+.nodatacopy:
+
+    /* Munge the main stack */
+    lea     stackbegin,%a2
+    lea     stackend,%a4
+    move.l  %a4,%sp
+    move.l  #0xdeadbeef,%d0
+.mungeloop:
+    move.l  %d0,(%a2)+
+    cmp.l   %a2,%a4
+    bhi.b   .mungeloop
+
+    jsr     main
+.hoo:
+    bra.b   .hoo
+
+    .section .resetvectors
+vectors:
+    .long   stackend
+    .long   start
diff --git a/firmware/target/sh/crt0.S b/firmware/target/sh/crt0.S
new file mode 100644
index 0000000000..87cef56e96
--- /dev/null
+++ b/firmware/target/sh/crt0.S
@@ -0,0 +1,214 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Linus Nielsen Feltzing
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "config.h"
+#include "cpu.h"
+
+    .section .init.text,"ax",@progbits
+
+    .global    start
+start:
+
+    mov.l   .vbr_k,r1
+#ifdef DEBUG
+    /* If we have built our code to be loaded via the standalone GDB
+     * stub, we will have out VBR at some other location than 0x9000000.
+     * We must copy the trap vectors for the GDB stub to our vector table. */
+    mov.l   .orig_vbr_k,r2
+
+    /* Move the invalid instruction vector (4) */
+    mov     #4,r0
+    shll2   r0
+    mov.l   @(r0,r2),r3
+    mov.l   r3,@(r0,r1)
+
+    /* Move the invalid slot vector (6) */
+    mov     #6,r0
+    shll2   r0
+    mov.l   @(r0,r2),r3
+    mov.l   r3,@(r0,r1)
+
+    /* Move the bus error vector (9) */
+    mov     #9,r0
+    shll2   r0
+    mov.l   @(r0,r2),r3
+    mov.l   r3,@(r0,r1)
+
+    /* Move the DMA bus error vector (10) */
+    mov     #10,r0
+    shll2   r0
+    mov.l   @(r0,r2),r3
+    mov.l   r3,@(r0,r1)
+
+    /* Move the NMI vector as well (11) */
+    mov     #11,r0
+    shll2   r0
+    mov.l   @(r0,r2),r3
+    mov.l   r3,@(r0,r1)
+
+    /* Move the UserBreak vector as well (12) */
+    mov     #12,r0
+    shll2   r0
+    mov.l   @(r0,r2),r3
+    mov.l   r3,@(r0,r1)
+
+    /* Move the breakpoint trap vector (32) */
+    mov     #32,r0
+    shll2   r0
+    mov.l   @(r0,r2),r3
+    mov.l   r3,@(r0,r1)
+
+    /* Move the IO trap vector (33) */
+    mov     #33,r0
+    shll2   r0
+    mov.l   @(r0,r2),r3
+    mov.l   r3,@(r0,r1)
+
+    /* Move the serial Rx interrupt vector (105) */
+    mov     #105,r0
+    shll2   r0
+    mov.l   @(r0,r2),r3
+    mov.l   r3,@(r0,r1)
+
+    /* Move the single step trap vector (127) */
+    mov     #127,r0
+    shll2   r0
+    mov.l   @(r0,r2),r3
+    mov.l   r3,@(r0,r1)
+#endif /* DEBUG */
+    ldc     r1,vbr
+
+    mov     #0,r0
+    ldc     r0,gbr
+
+    /* zero out .ibss */
+    mov.l   .iedata_k,r0
+    mov.l   .iend_k,r1
+    bra     .iedatastart
+    mov     #0,r2
+.iedataloop: /* backwards is faster and shorter */
+    mov.l   r2,@-r1
+.iedatastart:
+    cmp/hi  r0,r1
+    bt      .iedataloop
+
+    /* copy the .iram section */
+    mov.l   .iramcopy_k,r0
+    mov.l   .iram_k,r1
+    mov.l   .iramend_k,r2
+    /* Note: We cannot put a PC relative load into the delay slot of a 'bra'
+       instruction (the offset would be wrong), but there is nothing else to
+       do before the loop, so the delay slot would be 'nop'. The cmp / bf
+       sequence is the same length, but more efficient. */
+    cmp/hi  r1,r2
+    bf      .noiramcopy
+.iramloop:
+    mov.l   @r0+,r3
+    mov.l   r3,@r1
+    add     #4,r1
+    cmp/hi  r1,r2
+    bt      .iramloop
+.noiramcopy:
+
+    /* zero out bss */
+    mov.l   .edata_k,r0
+    mov.l   .end_k,r1
+    bra     .edatastart
+    mov     #0,r2
+.edataloop: /* backwards is faster and shorter */
+    mov.l   r2,@-r1
+.edatastart:
+    cmp/hi  r0,r1
+    bt      .edataloop
+
+    /* copy the .data section, for rombased execution */
+    mov.l   .datacopy_k,r0
+    mov.l   .data_k,r1
+    cmp/eq  r0,r1
+    bt      .nodatacopy   /* Don't copy if src and dest are equal */
+    mov.l   .dataend_k,r2
+    cmp/hi  r1,r2
+    bf      .nodatacopy
+.dataloop:
+    mov.l   @r0+,r3
+    mov.l   r3,@r1
+    add     #4,r1
+    cmp/hi  r1,r2
+    bt      .dataloop
+.nodatacopy:
+
+    /* Munge the main thread stack */
+    mov.l   .stackbegin_k,r0
+    mov.l   .stackend_k,r1
+    mov     r1,r15
+    mov.l   .deadbeef_k,r2
+.mungeloop: /* backwards is faster and shorter */
+    mov.l   r2,@-r1
+    cmp/hi  r0,r1
+    bt      .mungeloop
+
+    /* call the mainline */
+    mov.l   .main_k,r0
+    jsr     @r0
+    nop
+.hoo:
+    bra     .hoo
+    nop
+
+    .align  2
+.vbr_k:
+    .long   vectors
+#ifdef DEBUG
+.orig_vbr_k:
+    .long   0x09000000
+#endif
+.iedata_k:
+    .long   _iedata
+.iend_k:
+    .long   _iend
+.iramcopy_k:
+    .long   _iramcopy
+.iram_k:
+    .long   _iramstart
+.iramend_k:
+    .long   _iramend
+.edata_k:
+    .long   _edata
+.end_k:
+    .long   _end
+.datacopy_k:
+    .long   _datacopy
+.data_k:
+    .long   _datastart
+.dataend_k:
+    .long   _dataend
+.stackbegin_k:
+    .long   _stackbegin
+.stackend_k:
+    .long   _stackend
+.deadbeef_k:
+    .long   0xdeadbeef
+.main_k:
+    .long   _main
+
+    .section .resetvectors
+vectors:
+    .long   start
+    .long   _stackend
+    .long   start
+    .long   _stackend