CRIS: Merge machine dependent boot/compressed and boot/rescue

Merge the machine dependent boot directories for v10 and v32.
This avoids some code duplication and eases the way for further
merging later on.

Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>

7 files changed, 784 insertions, 0 deletions

diff --git a/arch/cris/boot/compressed/Makefile b/arch/cris/boot/compressed/Makefile
new file mode 100644
index 000000000000..8fe9338c1775
--- /dev/null
+++ b/arch/cris/boot/compressed/Makefile
@@ -0,0 +1,38 @@
+#
+# arch/cris/boot/compressed/Makefile
+#
+
+asflags-y += $(LINUXINCLUDE)
+ccflags-y += -O2 $(LINUXINCLUDE)
+
+# asflags-$(CONFIG_ETRAX_ARCH_V32) += -I$(srctree)/include/asm/mach \
+#                                   -I$(srctree)/include/asm/arch
+# ccflags-$(CONFIG_ETRAX_ARCH_V32) += -O2 -I$(srctree)/include/asm/mach
+#                                       -I$(srctree)/include/asm/arch
+
+arch-$(CONFIG_ETRAX_ARCH_V10) = v10
+arch-$(CONFIG_ETRAX_ARCH_V32) = v32
+
+ldflags-y += -T $(srctree)/$(src)/decompress_$(arch-y).lds
+
+OBJECTS-$(CONFIG_ETRAX_ARCH_V32) = $(obj)/head_v32.o
+OBJECTS-$(CONFIG_ETRAX_ARCH_V10) = $(obj)/head_v10.o
+OBJECTS= $(OBJECTS-y) $(obj)/misc.o
+OBJCOPYFLAGS = -O binary --remove-section=.bss
+
+quiet_cmd_image = BUILD   $@
+cmd_image = cat $(obj)/decompress.bin $(obj)/piggy.gz > $@
+
+targets := vmlinux piggy.gz decompress.o decompress.bin
+
+$(obj)/decompress.o: $(OBJECTS) FORCE
+        $(call if_changed,ld)
+
+$(obj)/decompress.bin: $(obj)/decompress.o FORCE
+        $(call if_changed,objcopy)
+
+$(obj)/vmlinux: $(obj)/piggy.gz $(obj)/decompress.bin FORCE
+        $(call if_changed,image)
+
+$(obj)/piggy.gz: $(obj)/../Image FORCE
+        $(call if_changed,gzip)
diff --git a/arch/cris/boot/compressed/README b/arch/cris/boot/compressed/README
new file mode 100644
index 000000000000..182c5d75784b
--- /dev/null
+++ b/arch/cris/boot/compressed/README
@@ -0,0 +1,24 @@
+Creation of the self-extracting compressed kernel image (vmlinuz)
+-----------------------------------------------------------------
+
+This can be slightly confusing because it's a process with many steps.
+
+The kernel object built by the arch/etrax100/Makefile, vmlinux, is split
+by that makefile into text and data binary files, vmlinux.text and
+vmlinux.data.
+
+Those files together with a ROM filesystem can be catted together and
+burned into a flash or executed directly at the DRAM origin.
+
+They can also be catted together and compressed with gzip, which is what
+happens in this makefile. Together they make up piggy.img.
+
+The decompressor is built into the file decompress.o. It is turned into
+the binary file decompress.bin, which is catted together with piggy.img
+into the file vmlinuz. It can be executed in an arbitrary place in flash.
+
+Be careful - it assumes some things about free locations in DRAM. It
+assumes the DRAM starts at 0x40000000 and that it is at least 8 MB,
+so it puts its code at 0x40700000, and initial stack at 0x40800000.
+
+-Bjorn
diff --git a/arch/cris/boot/compressed/decompress_v10.lds b/arch/cris/boot/compressed/decompress_v10.lds
new file mode 100644
index 000000000000..e80f4594d543
--- /dev/null
+++ b/arch/cris/boot/compressed/decompress_v10.lds
@@ -0,0 +1,30 @@
+/* OUTPUT_FORMAT(elf32-us-cris) */
+OUTPUT_FORMAT(elf32-cris)
+
+MEMORY 
+        {
+        dram : ORIGIN = 0x40700000,
+               LENGTH = 0x00100000
+        }
+
+SECTIONS
+{
+        .text :
+        {
+                _stext = . ;
+                *(.text)
+                *(.rodata)
+                *(.rodata.*)
+                _etext = . ;
+        } > dram
+        .data :
+        {
+                *(.data)
+                _edata = . ;
+        } > dram
+        .bss :
+        {
+                *(.bss)
+                _end = ALIGN( 0x10 ) ;
+        } > dram
+}
diff --git a/arch/cris/boot/compressed/decompress_v32.lds b/arch/cris/boot/compressed/decompress_v32.lds
new file mode 100644
index 000000000000..3c837feca3ac
--- /dev/null
+++ b/arch/cris/boot/compressed/decompress_v32.lds
@@ -0,0 +1,30 @@
+/*#OUTPUT_FORMAT(elf32-us-cris) */
+OUTPUT_ARCH (crisv32)
+
+MEMORY
+        {
+        dram : ORIGIN = 0x40700000,
+               LENGTH = 0x00100000
+        }
+
+SECTIONS
+{
+        .text :
+        {
+                _stext = . ;
+                *(.text)
+                *(.rodata)
+                *(.rodata.*)
+                _etext = . ;
+        } > dram
+        .data :
+        {
+                *(.data)
+                _edata = . ;
+        } > dram
+        .bss :
+        {
+                *(.bss)
+                _end = ALIGN( 0x10 ) ;
+        } > dram
+}
diff --git a/arch/cris/boot/compressed/head_v10.S b/arch/cris/boot/compressed/head_v10.S
new file mode 100644
index 000000000000..9edb8ade7e1f
--- /dev/null
+++ b/arch/cris/boot/compressed/head_v10.S
@@ -0,0 +1,126 @@
+/*
+ *  arch/cris/boot/compressed/head.S
+ *
+ *  Copyright (C) 1999, 2001 Axis Communications AB
+ *
+ *  Code that sets up the DRAM registers, calls the
+ *  decompressor to unpack the piggybacked kernel, and jumps.
+ *
+ */
+
+#define ASSEMBLER_MACROS_ONLY
+#include <arch/sv_addr_ag.h>
+
+#define RAM_INIT_MAGIC 0x56902387
+#define COMMAND_LINE_MAGIC 0x87109563
+
+        ;; Exported symbols
+
+        .globl  input_data
+
+
+        .text
+
+        nop
+        di
+
+;; We need to initialze DRAM registers before we start using the DRAM
+
+        cmp.d   RAM_INIT_MAGIC, $r8     ; Already initialized?
+        beq     dram_init_finished
+        nop
+
+#include "../../arch-v10/lib/dram_init.S"
+
+dram_init_finished:
+
+        ;; Initiate the PA and PB ports
+
+        move.b   CONFIG_ETRAX_DEF_R_PORT_PA_DATA, $r0
+        move.b   $r0, [R_PORT_PA_DATA]
+
+        move.b   CONFIG_ETRAX_DEF_R_PORT_PA_DIR, $r0
+        move.b   $r0, [R_PORT_PA_DIR]
+
+        move.b   CONFIG_ETRAX_DEF_R_PORT_PB_DATA, $r0
+        move.b   $r0, [R_PORT_PB_DATA]
+
+        move.b   CONFIG_ETRAX_DEF_R_PORT_PB_DIR, $r0
+        move.b   $r0, [R_PORT_PB_DIR]
+
+        ;; Setup the stack to a suitably high address.
+        ;; We assume 8 MB is the minimum DRAM in an eLinux
+        ;; product and put the sp at the top for now.
+
+        move.d  0x40800000, $sp
+
+        ;; Figure out where the compressed piggyback image is
+        ;; in the flash (since we wont try to copy it to DRAM
+        ;; before unpacking). It is at _edata, but in flash.
+        ;; Use (_edata - basse) as offset to the current PC.
+
+basse:  move.d  $pc, $r5
+        and.d   0x7fffffff, $r5 ; strip any non-cache bit
+        subq    2, $r5          ; compensate for the move.d $pc instr
+        move.d  $r5, $r0                ; save for later - flash address of 'basse'
+        add.d   _edata, $r5
+        sub.d   basse, $r5      ; $r5 = flash address of '_edata'
+
+        ;; Copy text+data to DRAM
+
+        move.d  basse, $r1      ; destination
+        move.d  _edata, $r2     ; end destination
+1:      move.w  [$r0+], $r3
+        move.w  $r3, [$r1+]
+        cmp.d   $r2, $r1
+        bcs     1b
+        nop
+
+        move.d  $r5, [input_data] ; for the decompressor
+
+
+        ;; Clear the decompressors BSS (between _edata and _end)
+
+        moveq   0, $r0
+        move.d  _edata, $r1
+        move.d  _end, $r2
+1:      move.w  $r0, [$r1+]
+        cmp.d   $r2, $r1
+        bcs     1b
+        nop
+
+        ;;  Save command line magic and address.
+        move.d  _cmd_line_magic, $r12
+        move.d  $r10, [$r12]
+        move.d  _cmd_line_addr, $r12
+        move.d  $r11, [$r12]
+
+        ;; Do the decompression and save compressed size in inptr
+
+        jsr     decompress_kernel
+
+        ;; Put start address of root partition in $r9 so the kernel can use it
+        ;; when mounting from flash
+
+        move.d  [input_data], $r9       ; flash address of compressed kernel
+        add.d   [inptr], $r9            ; size of compressed kernel
+
+        ;; Restore command line magic and address.
+        move.d  _cmd_line_magic, $r10
+        move.d  [$r10], $r10
+        move.d  _cmd_line_addr, $r11
+        move.d  [$r11], $r11
+
+        ;; Enter the decompressed kernel
+        move.d  RAM_INIT_MAGIC, $r8     ; Tell kernel that DRAM is initialized
+        jump    0x40004000      ; kernel is linked to this address
+
+        .data
+
+input_data:
+        .dword  0               ; used by the decompressor
+_cmd_line_magic:
+        .dword 0
+_cmd_line_addr:
+        .dword 0
+#include "../../arch-v10/lib/hw_settings.S"
diff --git a/arch/cris/boot/compressed/head_v32.S b/arch/cris/boot/compressed/head_v32.S
new file mode 100644
index 000000000000..f483005f3d48
--- /dev/null
+++ b/arch/cris/boot/compressed/head_v32.S
@@ -0,0 +1,145 @@
+/*
+ *  Code that sets up the DRAM registers, calls the
+ *  decompressor to unpack the piggybacked kernel, and jumps.
+ *
+ *  Copyright (C) 1999 - 2006, Axis Communications AB
+ */
+
+#define ASSEMBLER_MACROS_ONLY
+#include <hwregs/asm/reg_map_asm.h>
+#include <mach/startup.inc>
+
+#define RAM_INIT_MAGIC 0x56902387
+#define COMMAND_LINE_MAGIC 0x87109563
+
+        ;; Exported symbols
+
+        .globl  input_data
+
+        .text
+start:
+        di
+
+        ;; Start clocks for used blocks.
+        START_CLOCKS
+
+        ;; Initialize the DRAM registers.
+        cmp.d   RAM_INIT_MAGIC, $r8     ; Already initialized?
+        beq     dram_init_finished
+        nop
+
+#if defined CONFIG_ETRAXFS
+#include "../../arch-v32/mach-fs/dram_init.S"
+#elif defined CONFIG_CRIS_MACH_ARTPEC3
+#include "../../arch-v32/mach-a3/dram_init.S"
+#else
+#error Only ETRAXFS and ARTPEC-3 supported!
+#endif
+
+dram_init_finished:
+
+        GIO_INIT
+        ;; Setup the stack to a suitably high address.
+        ;; We assume 8 MB is the minimum DRAM and put
+        ;; the SP at the top for now.
+
+        move.d  0x40800000, $sp
+
+        ;; Figure out where the compressed piggyback image is.
+        ;; It is either in [NOR] flash (we don't want to copy it
+        ;; to DRAM before unpacking), or copied to DRAM
+        ;; by the [NAND] flash boot loader.
+        ;; The piggyback image is at _edata, but relative to where the
+        ;; image is actually located in memory, not where it is linked
+        ;; (the decompressor is linked at 0x40700000+ and runs there).
+        ;; Use (_edata - herami) as offset to the current PC.
+
+hereami:
+        lapcq   ., $r5          ; get PC
+        and.d   0x7fffffff, $r5 ; strip any non-cache bit
+        move.d  $r5, $r0        ; source address of 'herami'
+        add.d   _edata, $r5
+        sub.d   hereami, $r5    ; r5 = flash address of '_edata'
+        move.d  hereami, $r1    ; destination
+
+        ;; Copy text+data to DRAM
+
+        move.d  _edata, $r2     ; end destination
+1:      move.w  [$r0+], $r3     ; from herami+ source
+        move.w  $r3, [$r1+]     ; to hereami+ destination (linked address)
+        cmp.d   $r2, $r1        ; finish when destination == _edata
+        bcs     1b
+        nop
+        move.d  input_data, $r0 ; for the decompressor
+        move.d  $r5, [$r0]      ; for the decompressor
+
+        ;; Clear the decompressors BSS (between _edata and _end)
+
+        moveq   0, $r0
+        move.d  _edata, $r1
+        move.d  _end, $r2
+1:      move.w  $r0, [$r1+]
+        cmp.d   $r2, $r1
+        bcs     1b
+        nop
+
+        ;;  Save command line magic and address.
+        move.d  _cmd_line_magic, $r0
+        move.d  $r10, [$r0]
+        move.d  _cmd_line_addr, $r0
+        move.d  $r11, [$r0]
+
+        ;;  Save boot source indicator
+        move.d  _boot_source, $r0
+        move.d  $r12, [$r0]
+
+        ;; Do the decompression and save compressed size in _inptr
+
+        jsr     decompress_kernel
+        nop
+
+        ;; Restore boot source indicator
+        move.d  _boot_source, $r12
+        move.d  [$r12], $r12
+
+        ;; Restore command line magic and address.
+        move.d  _cmd_line_magic, $r10
+        move.d  [$r10], $r10
+        move.d  _cmd_line_addr, $r11
+        move.d  [$r11], $r11
+
+        ;; Put start address of root partition in r9 so the kernel can use it
+        ;; when mounting from flash
+        move.d  input_data, $r0
+        move.d  [$r0], $r9              ; flash address of compressed kernel
+        move.d  inptr, $r0
+        add.d   [$r0], $r9              ; size of compressed kernel
+        cmp.d   0x40000000, $r9         ; image in DRAM ?
+        blo     enter_kernel            ; no, must be [NOR] flash, jump
+        nop                             ; delay slot
+        and.d   0x001fffff, $r9         ; assume compressed kernel was < 2M
+
+enter_kernel:
+        ;; Enter the decompressed kernel
+        move.d  RAM_INIT_MAGIC, $r8     ; Tell kernel that DRAM is initialized
+        jump    0x40004000      ; kernel is linked to this address
+        nop
+
+        .data
+
+input_data:
+        .dword  0               ; used by the decompressor
+_cmd_line_magic:
+        .dword 0
+_cmd_line_addr:
+        .dword 0
+_boot_source:
+        .dword 0
+
+#if defined CONFIG_ETRAXFS
+#include "../../arch-v32/mach-fs/hw_settings.S"
+#elif defined CONFIG_CRIS_MACH_ARTPEC3
+#include "../../arch-v32/mach-a3/hw_settings.S"
+#else
+#error Only ETRAXFS and ARTPEC-3 supported!
+#endif
diff --git a/arch/cris/boot/compressed/misc.c b/arch/cris/boot/compressed/misc.c
new file mode 100644
index 000000000000..47bc190ba6d4
--- /dev/null
+++ b/arch/cris/boot/compressed/misc.c
@@ -0,0 +1,391 @@
+/*
+ * misc.c
+ *
+ * This is a collection of several routines from gzip-1.0.3
+ * adapted for Linux.
+ *
+ * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
+ * puts by Nick Holloway 1993, better puts by Martin Mares 1995
+ * adaptation for Linux/CRIS Axis Communications AB, 1999
+ *
+ */
+
+/* where the piggybacked kernel image expects itself to live.
+ * it is the same address we use when we network load an uncompressed
+ * image into DRAM, and it is the address the kernel is linked to live
+ * at by vmlinux.lds.S
+ */
+
+#define KERNEL_LOAD_ADR 0x40004000
+
+#include <linux/types.h>
+
+#ifdef CONFIG_ETRAX_ARCH_V32
+#include <hwregs/reg_rdwr.h>
+#include <hwregs/reg_map.h>
+#include <hwregs/ser_defs.h>
+#include <hwregs/pinmux_defs.h>
+#ifdef CONFIG_CRIS_MACH_ARTPEC3
+#include <hwregs/clkgen_defs.h>
+#endif
+#else
+#include <arch/svinto.h>
+#endif
+
+/*
+ * gzip declarations
+ */
+
+#define OF(args)  args
+#define STATIC static
+
+void *memset(void *s, int c, size_t n);
+void *memcpy(void *__dest, __const void *__src, size_t __n);
+
+#define memzero(s, n)     memset((s), 0, (n))
+
+typedef unsigned char  uch;
+typedef unsigned short ush;
+typedef unsigned long  ulg;
+
+#define WSIZE 0x8000            /* Window size must be at least 32k, */
+                                /* and a power of two */
+
+static uch *inbuf;           /* input buffer */
+static uch window[WSIZE];    /* Sliding window buffer */
+
+unsigned inptr = 0;     /* index of next byte to be processed in inbuf
+                         * After decompression it will contain the
+                         * compressed size, and head.S will read it.
+                         */
+
+static unsigned outcnt = 0;  /* bytes in output buffer */
+
+/* gzip flag byte */
+#define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
+#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
+#define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
+#define ORIG_NAME    0x08 /* bit 3 set: original file name present */
+#define COMMENT      0x10 /* bit 4 set: file comment present */
+#define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
+#define RESERVED     0xC0 /* bit 6,7:   reserved */
+
+#define get_byte() (inbuf[inptr++])
+
+/* Diagnostic functions */
+#ifdef DEBUG
+#  define Assert(cond, msg) do { \
+                if (!(cond)) \
+                        error(msg); \
+        } while (0)
+#  define Trace(x) fprintf x
+#  define Tracev(x) do { \
+                if (verbose) \
+                        fprintf x; \
+        } while (0)
+#  define Tracevv(x) do { \
+                if (verbose > 1) \
+                        fprintf x; \
+        } while (0)
+#  define Tracec(c, x) do { \
+                if (verbose && (c)) \
+                        fprintf x; \
+        } while (0)
+#  define Tracecv(c, x) do { \
+                if (verbose > 1 && (c)) \
+                        fprintf x; \
+        } while (0)
+#else
+#  define Assert(cond, msg)
+#  define Trace(x)
+#  define Tracev(x)
+#  define Tracevv(x)
+#  define Tracec(c, x)
+#  define Tracecv(c, x)
+#endif
+
+static void flush_window(void);
+static void error(char *m);
+static void puts(const char *);
+
+extern char *input_data;  /* lives in head.S */
+
+static long bytes_out;
+static uch *output_data;
+static unsigned long output_ptr;
+
+/* the "heap" is put directly after the BSS ends, at end */
+
+extern int _end;
+static long free_mem_ptr = (long)&_end;
+static long free_mem_end_ptr;
+
+#include "../../../../../lib/inflate.c"
+
+/* decompressor info and error messages to serial console */
+
+#ifdef CONFIG_ETRAX_ARCH_V32
+static inline void serout(const char *s, reg_scope_instances regi_ser)
+{
+        reg_ser_rs_stat_din rs;
+        reg_ser_rw_dout dout = {.data = *s};
+
+        do {
+                rs = REG_RD(ser, regi_ser, rs_stat_din);
+        }
+        while (!rs.tr_rdy);/* Wait for transceiver. */
+
+        REG_WR(ser, regi_ser, rw_dout, dout);
+}
+#endif
+
+static void puts(const char *s)
+{
+#ifndef CONFIG_ETRAX_DEBUG_PORT_NULL
+        while (*s) {
+#ifdef CONFIG_ETRAX_DEBUG_PORT0
+#ifdef CONFIG_ETRAX_ARCH_V32
+                serout(s, regi_ser0);
+#else
+                while (!(*R_SERIAL0_STATUS & (1 << 5)))
+                        ;
+                *R_SERIAL0_TR_DATA = *s++;
+#endif
+#endif
+#ifdef CONFIG_ETRAX_DEBUG_PORT1
+#ifdef CONFIG_ETRAX_ARCH_V32
+                serout(s, regi_ser1);
+#else
+                while (!(*R_SERIAL1_STATUS & (1 << 5)))
+                        ;
+                *R_SERIAL1_TR_DATA = *s++;
+#endif
+#endif
+#ifdef CONFIG_ETRAX_DEBUG_PORT2
+#ifdef CONFIG_ETRAX_ARCH_V32
+                serout(s, regi_ser2);
+#else
+                while (!(*R_SERIAL2_STATUS & (1 << 5)))
+                        ;
+                *R_SERIAL2_TR_DATA = *s++;
+#endif
+#endif
+#ifdef CONFIG_ETRAX_DEBUG_PORT3
+#ifdef CONFIG_ETRAX_ARCH_V32
+                serout(s, regi_ser3);
+#else
+                while (!(*R_SERIAL3_STATUS & (1 << 5)))
+                        ;
+                *R_SERIAL3_TR_DATA = *s++;
+#endif
+#endif
+                *s++;
+        }
+/* CONFIG_ETRAX_DEBUG_PORT_NULL */
+#endif
+}
+
+void *memset(void *s, int c, size_t n)
+{
+        int i;
+        char *ss = (char*)s;
+
+        for (i=0;i<n;i++) ss[i] = c;
+
+        return s;
+}
+
+void *memcpy(void *__dest, __const void *__src, size_t __n)
+{
+        int i;
+        char *d = (char *)__dest, *s = (char *)__src;
+
+        for (i = 0; i < __n; i++)
+                d[i] = s[i];
+
+        return __dest;
+}
+
+/* ===========================================================================
+ * Write the output window window[0..outcnt-1] and update crc and bytes_out.
+ * (Used for the decompressed data only.)
+ */
+
+static void flush_window(void)
+{
+        ulg c = crc;         /* temporary variable */
+        unsigned n;
+        uch *in, *out, ch;
+
+        in = window;
+        out = &output_data[output_ptr];
+        for (n = 0; n < outcnt; n++) {
+                ch = *out = *in;
+                out++;
+                in++;
+                c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
+        }
+        crc = c;
+        bytes_out += (ulg)outcnt;
+        output_ptr += (ulg)outcnt;
+        outcnt = 0;
+}
+
+static void error(char *x)
+{
+        puts("\n\n");
+        puts(x);
+        puts("\n\n -- System halted\n");
+
+        while(1);       /* Halt */
+}
+
+void setup_normal_output_buffer(void)
+{
+        output_data = (char *)KERNEL_LOAD_ADR;
+}
+
+#ifdef CONFIG_ETRAX_ARCH_V32
+static inline void serial_setup(reg_scope_instances regi_ser)
+{
+        reg_ser_rw_xoff xoff;
+        reg_ser_rw_tr_ctrl tr_ctrl;
+        reg_ser_rw_rec_ctrl rec_ctrl;
+        reg_ser_rw_tr_baud_div tr_baud;
+        reg_ser_rw_rec_baud_div rec_baud;
+
+        /* Turn off XOFF. */
+        xoff = REG_RD(ser, regi_ser, rw_xoff);
+
+        xoff.chr = 0;
+        xoff.automatic = regk_ser_no;
+
+        REG_WR(ser, regi_ser, rw_xoff, xoff);
+
+        /* Set baudrate and stopbits. */
+        tr_ctrl = REG_RD(ser, regi_ser, rw_tr_ctrl);
+        rec_ctrl = REG_RD(ser, regi_ser, rw_rec_ctrl);
+        tr_baud = REG_RD(ser, regi_ser, rw_tr_baud_div);
+        rec_baud = REG_RD(ser, regi_ser, rw_rec_baud_div);
+
+        tr_ctrl.stop_bits = 1;  /* 2 stop bits. */
+        tr_ctrl.en = 1; /* enable transmitter */
+        rec_ctrl.en = 1; /* enabler receiver */
+
+        /*
+         * The baudrate setup used to be a bit fishy, but now transmitter and
+         * receiver are both set to the intended baud rate, 115200.
+         * The magic value is 29.493 MHz.
+         */
+        tr_ctrl.base_freq = regk_ser_f29_493;
+        rec_ctrl.base_freq = regk_ser_f29_493;
+        tr_baud.div = (29493000 / 8) / 115200;
+        rec_baud.div = (29493000 / 8) / 115200;
+
+        REG_WR(ser, regi_ser, rw_tr_ctrl, tr_ctrl);
+        REG_WR(ser, regi_ser, rw_tr_baud_div, tr_baud);
+        REG_WR(ser, regi_ser, rw_rec_ctrl, rec_ctrl);
+        REG_WR(ser, regi_ser, rw_rec_baud_div, rec_baud);
+}
+#endif
+
+void decompress_kernel(void)
+{
+        char revision;
+        char compile_rev;
+
+#ifdef CONFIG_ETRAX_ARCH_V32
+        /* Need at least a CRISv32 to run. */
+        compile_rev = 32;
+#if defined(CONFIG_ETRAX_DEBUG_PORT1) || \
+    defined(CONFIG_ETRAX_DEBUG_PORT2) || \
+    defined(CONFIG_ETRAX_DEBUG_PORT3)
+        reg_pinmux_rw_hwprot hwprot;
+
+#ifdef CONFIG_CRIS_MACH_ARTPEC3
+        reg_clkgen_rw_clk_ctrl clk_ctrl;
+
+        /* Enable corresponding clock region when serial 1..3 selected */
+
+        clk_ctrl = REG_RD(clkgen, regi_clkgen, rw_clk_ctrl);
+        clk_ctrl.sser_ser_dma6_7 = regk_clkgen_yes;
+        REG_WR(clkgen, regi_clkgen, rw_clk_ctrl, clk_ctrl);
+#endif
+
+        /* pinmux setup for ports 1..3 */
+        hwprot = REG_RD(pinmux, regi_pinmux, rw_hwprot);
+#endif
+
+
+#ifdef CONFIG_ETRAX_DEBUG_PORT0
+        serial_setup(regi_ser0);
+#endif
+#ifdef CONFIG_ETRAX_DEBUG_PORT1
+        hwprot.ser1 = regk_pinmux_yes;
+        serial_setup(regi_ser1);
+#endif
+#ifdef CONFIG_ETRAX_DEBUG_PORT2
+        hwprot.ser2 = regk_pinmux_yes;
+        serial_setup(regi_ser2);
+#endif
+#ifdef CONFIG_ETRAX_DEBUG_PORT3
+        hwprot.ser3 = regk_pinmux_yes;
+        serial_setup(regi_ser3);
+#endif
+#if defined(CONFIG_ETRAX_DEBUG_PORT1) || \
+    defined(CONFIG_ETRAX_DEBUG_PORT2) || \
+    defined(CONFIG_ETRAX_DEBUG_PORT3)
+        REG_WR(pinmux, regi_pinmux, rw_hwprot, hwprot);
+#endif
+
+        /* input_data is set in head.S */
+        inbuf = input_data;
+#else /* CRISv10 */
+        /* Need at least a crisv10 to run. */
+        compile_rev = 10;
+
+        /* input_data is set in head.S */
+        inbuf = input_data;
+
+#ifdef CONFIG_ETRAX_DEBUG_PORT0
+        *R_SERIAL0_XOFF = 0;
+        *R_SERIAL0_BAUD = 0x99;
+        *R_SERIAL0_TR_CTRL = 0x40;
+#endif
+#ifdef CONFIG_ETRAX_DEBUG_PORT1
+        *R_SERIAL1_XOFF = 0;
+        *R_SERIAL1_BAUD = 0x99;
+        *R_SERIAL1_TR_CTRL = 0x40;
+#endif
+#ifdef CONFIG_ETRAX_DEBUG_PORT2
+        *R_GEN_CONFIG = 0x08;
+        *R_SERIAL2_XOFF = 0;
+        *R_SERIAL2_BAUD = 0x99;
+        *R_SERIAL2_TR_CTRL = 0x40;
+#endif
+#ifdef CONFIG_ETRAX_DEBUG_PORT3
+        *R_GEN_CONFIG = 0x100;
+        *R_SERIAL3_XOFF = 0;
+        *R_SERIAL3_BAUD = 0x99;
+        *R_SERIAL3_TR_CTRL = 0x40;
+#endif
+#endif
+
+        setup_normal_output_buffer();
+
+        makecrc();
+
+        __asm__ volatile ("move $vr,%0" : "=rm" (revision));
+        if (revision < compile_rev) {
+#ifdef CONFIG_ETRAX_ARCH_V32
+                puts("You need an ETRAX FS to run Linux 2.6/crisv32\n");
+#else
+                puts("You need an ETRAX 100LX to run linux 2.6\n");
+#endif
+                while(1);
+        }
+
+        puts("Uncompressing Linux...\n");
+        gunzip();
+        puts("Done. Now booting the kernel\n");
+}