* Patch by Andrea Scian, 17 Feb 2004:

  Add support for S3C44B0 processor and DAVE B2 board

* Patch by Steven Scholz, 20 Feb 2004:
  - Add support for MII commands on AT91RM9200 boards
  - some cleanup in AT91RM9200 ethernet code

6 files changed, 1306 insertions, 0 deletions

diff --git a/cpu/s3c44b0/Makefile b/cpu/s3c44b0/Makefile
new file mode 100644
index 0000000000..d43c73e533
--- /dev/null
+++ b/cpu/s3c44b0/Makefile
@@ -0,0 +1,43 @@
+#
+# (C) Copyright 2000-2004
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# 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 program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+include $(TOPDIR)/config.mk
+
+LIB	= lib$(CPU).a
+
+START	= start.o
+OBJS	= serial.o interrupts.o cpu.o
+
+all:	.depend $(START) $(LIB)
+
+$(LIB):	$(OBJS)
+	$(AR) crv $@ $(OBJS)
+
+#########################################################################
+
+.depend:	Makefile $(START:.o=.S) $(OBJS:.o=.c)
+		$(CC) -M $(CFLAGS) $(START:.o=.S) $(OBJS:.o=.c) > $@
+
+sinclude .depend
+
+#########################################################################
diff --git a/cpu/s3c44b0/config.mk b/cpu/s3c44b0/config.mk
new file mode 100644
index 0000000000..a1c5dd10a5
--- /dev/null
+++ b/cpu/s3c44b0/config.mk
@@ -0,0 +1,28 @@
+#
+# (C) Copyright 2002
+# Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+# Marius Groeger <mgroeger@sysgo.de>
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# 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 program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+PLATFORM_RELFLAGS += -fno-strict-aliasing  -fno-common -ffixed-r8 \
+	-mshort-load-bytes -msoft-float
+
+PLATFORM_CPPFLAGS += -mapcs-32 -march=armv4 -mtune=arm7tdmi -msoft-float
diff --git a/cpu/s3c44b0/cpu.c b/cpu/s3c44b0/cpu.c
new file mode 100644
index 0000000000..1a8a17dc52
--- /dev/null
+++ b/cpu/s3c44b0/cpu.c
@@ -0,0 +1,511 @@
+/*
+ * (C) Copyright 2004
+ * DAVE Srl
+ * http://www.dave-tech.it
+ * http://www.wawnet.biz
+ * mailto:info@wawnet.biz
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+ * S3C44B0 CPU specific code
+ */
+
+#include <common.h>
+#include <command.h>
+#include <asm/hardware.h>
+
+static void s3c44b0_flush_cache(void)
+{
+	volatile int i;
+	/* flush cycle */
+	for(i=0x10002000;i<0x10004800;i+=16)
+	{
+		*((int *)i)=0x0;
+	}
+}
+
+
+int cpu_init (void)
+{
+	icache_enable();
+
+	return 0;
+}
+
+int cleanup_before_linux (void)
+{
+	/*
+		cache memory should be enabled before calling
+		Linux to make the kernel uncompression faster
+	*/
+	icache_enable();
+
+	disable_interrupts ();
+
+	return 0;
+}
+
+void reset_cpu (ulong addr)
+{
+	/*
+		reset the cpu using watchdog
+	*/
+
+	/* Disable the watchdog.*/
+	WTCON&=~(1<<5);
+
+	/* set the timeout value to a short time... */
+	WTCNT = 0x1;
+
+	/* Enable the watchdog. */
+	WTCON|=1;
+	WTCON|=(1<<5);
+
+	while(1) {
+		/*NOP*/
+	}
+}
+
+int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	extern void reset_cpu (ulong addr);
+
+	disable_interrupts ();
+	reset_cpu (0);
+
+	/*NOTREACHED*/
+	return (0);
+}
+
+void icache_enable (void)
+{
+	ulong reg;
+
+	s3c44b0_flush_cache();
+
+	/*
+		Init cache
+		Non-cacheable area (everything outside RAM)
+		0x0000:0000 - 0x0C00:0000
+	 */
+	NCACHBE0 = 0xC0000000;
+	NCACHBE1 = 0x00000000;
+
+	/*
+		Enable chache
+	*/
+	reg = SYSCFG;
+	reg |= 0x00000006; /* 8kB */
+	SYSCFG = reg;
+}
+
+void icache_disable (void)
+{
+	ulong reg;
+
+	reg = SYSCFG;
+	reg &= ~0x00000006; /* 8kB */
+	SYSCFG = reg;
+}
+
+int icache_status (void)
+{
+	return 0;
+}
+
+void dcache_enable (void)
+{
+	icache_enable();
+}
+
+void dcache_disable (void)
+{
+	icache_disable();
+}
+
+int dcache_status (void)
+{
+	return dcache_status();
+}
+
+/*
+	RTC stuff
+*/
+#include <rtc.h>
+#ifndef BCD2HEX
+	#define BCD2HEX(n)  ((n>>4)*10+(n&0x0f))
+#endif
+#ifndef HEX2BCD
+	#define HEX2BCD(x) ((((x) / 10) << 4) + (x) % 10)
+#endif
+
+void rtc_get (struct rtc_time* tm)
+{
+	RTCCON |= 1;
+	tm->tm_year  = BCD2HEX(BCDYEAR);
+	tm->tm_mon   = BCD2HEX(BCDMON);
+	tm->tm_wday   = BCD2HEX(BCDDATE);
+	tm->tm_mday   = BCD2HEX(BCDDAY);
+	tm->tm_hour  = BCD2HEX(BCDHOUR);
+	tm->tm_min  = BCD2HEX(BCDMIN);
+	tm->tm_sec  = BCD2HEX(BCDSEC);
+
+	if (tm->tm_sec==0) {
+		/* we have to re-read the rtc data because of the "one second deviation" problem */
+		/* see RTC datasheet for more info about it */
+		tm->tm_year  = BCD2HEX(BCDYEAR);
+		tm->tm_mon   = BCD2HEX(BCDMON);
+		tm->tm_mday   = BCD2HEX(BCDDAY);
+		tm->tm_wday   = BCD2HEX(BCDDATE);
+		tm->tm_hour  = BCD2HEX(BCDHOUR);
+		tm->tm_min  = BCD2HEX(BCDMIN);
+		tm->tm_sec  = BCD2HEX(BCDSEC);
+	}
+
+	RTCCON &= ~1;
+
+	if(tm->tm_year >= 70)
+		tm->tm_year += 1900;
+	else
+		tm->tm_year += 2000;
+}
+
+void rtc_set (struct rtc_time* tm)
+{
+	if(tm->tm_year < 2000)
+		tm->tm_year -= 1900;
+	else
+		tm->tm_year -= 2000;
+
+	RTCCON |= 1;
+	BCDYEAR = HEX2BCD(tm->tm_year);
+	BCDMON = HEX2BCD(tm->tm_mon);
+	BCDDAY = HEX2BCD(tm->tm_mday);
+	BCDDATE = HEX2BCD(tm->tm_wday);
+	BCDHOUR = HEX2BCD(tm->tm_hour);
+	BCDMIN = HEX2BCD(tm->tm_min);
+	BCDSEC = HEX2BCD(tm->tm_sec);
+	RTCCON &= 1;
+}
+
+void rtc_reset (void)
+{
+	RTCCON |= 1;
+	BCDYEAR = 0;
+	BCDMON = 0;
+	BCDDAY = 0;
+	BCDDATE = 0;
+	BCDHOUR = 0;
+	BCDMIN = 0;
+	BCDSEC = 0;
+	RTCCON &= 1;
+}
+
+
+/*
+	I2C stuff
+*/
+
+/*
+ * Initialization, must be called once on start up, may be called
+ * repeatedly to change the speed and slave addresses.
+ */
+void i2c_init(int speed, int slaveaddr)
+{
+	/*
+		setting up I2C support
+	*/
+	unsigned int save_F,save_PF,rIICCON,rPCONA,rPDATA,rPCONF,rPUPF;
+
+	save_F = PCONF;
+	save_PF = PUPF;
+
+	rPCONF = ((save_F & ~(0xF))| 0xa);
+	rPUPF = (save_PF | 0x3);
+	PCONF = rPCONF; /*PF0:IICSCL, PF1:IICSDA*/
+	PUPF = rPUPF; /* Disable pull-up */
+
+	/* Configuring pin for WC pin of EEprom */
+	rPCONA = PCONA;
+	rPCONA &= ~(1<<9);
+	PCONA = rPCONA;
+
+	rPDATA = PDATA;
+	rPDATA &= ~(1<<9);
+	PDATA = rPDATA;
+
+	/*
+		Enable ACK, IICCLK=MCLK/16, enable interrupt
+		75Mhz/16/(12+1) = 390625 Hz
+	*/
+	rIICCON=(1<<7)|(0<<6)|(1<<5)|(0xC);
+	IICCON = rIICCON;
+
+	IICADD = slaveaddr;
+}
+
+/*
+ * Probe the given I2C chip address.  Returns 0 if a chip responded,
+ * not 0 on failure.
+ */
+int i2c_probe(uchar chip)
+{
+	/*
+		not implemented
+	*/
+
+	printf(__FUNCTION__ " chip %d\n", (int) chip);
+	return -1;
+}
+
+/*
+ * Read/Write interface:
+ *   chip:    I2C chip address, range 0..127
+ *   addr:    Memory (register) address within the chip
+ *   alen:    Number of bytes to use for addr (typically 1, 2 for larger
+ *              memories, 0 for register type devices with only one
+ *              register)
+ *   buffer:  Where to read/write the data
+ *   len:     How many bytes to read/write
+ *
+ *   Returns: 0 on success, not 0 on failure
+ */
+
+#define S3C44B0X_rIIC_INTPEND               (1<<4)
+#define S3C44B0X_rIIC_LAST_RECEIV_BIT       (1<<0)
+#define S3C44B0X_rIIC_INTERRUPT_ENABLE      (1<<5)
+#define S3C44B0_IIC_TIMEOUT 100
+
+int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
+{
+
+	int k, j, temp;
+	u32 rIICSTAT;
+
+	/*
+		send the device offset
+	*/
+
+	rIICSTAT = 0xD0;
+	IICSTAT = rIICSTAT;
+
+	IICDS = chip;	/* this is a write operation... */
+
+	rIICSTAT |= (1<<5);
+	IICSTAT = rIICSTAT;
+
+	for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) {
+		temp = IICCON;
+		if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND)
+		break;
+		udelay(2000);
+	}
+	if (k==S3C44B0_IIC_TIMEOUT)
+		return -1;
+
+	/* wait and check ACK */
+	temp = IICSTAT;
+	if ((temp & S3C44B0X_rIIC_LAST_RECEIV_BIT) == S3C44B0X_rIIC_LAST_RECEIV_BIT )
+		return -1;
+
+	IICDS = addr;
+	IICCON = IICCON & ~(S3C44B0X_rIIC_INTPEND);
+
+	/* wait and check ACK */
+	for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) {
+		temp = IICCON;
+		if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND)
+		break;
+		udelay(2000);
+	}
+	if (k==S3C44B0_IIC_TIMEOUT)
+		return -1;
+
+	temp = IICSTAT;
+	if ((temp & S3C44B0X_rIIC_LAST_RECEIV_BIT) == S3C44B0X_rIIC_LAST_RECEIV_BIT )
+		return -1;
+
+	/*
+		now we can start with the read operation...
+	*/
+
+	IICDS = chip | 0x01;	/* this is a read operation... */
+
+	rIICSTAT = 0x90; /*master recv*/
+	rIICSTAT |= (1<<5);
+	IICSTAT = rIICSTAT;
+
+	IICCON = IICCON & ~(S3C44B0X_rIIC_INTPEND);
+
+	/* wait and check ACK */
+	for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) {
+		temp = IICCON;
+		if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND)
+		break;
+		udelay(2000);
+	}
+	if (k==S3C44B0_IIC_TIMEOUT)
+		return -1;
+
+	temp = IICSTAT;
+	if ((temp & S3C44B0X_rIIC_LAST_RECEIV_BIT) == S3C44B0X_rIIC_LAST_RECEIV_BIT )
+		return -1;
+
+	for (j=0; j<len-1; j++) {
+
+	/*clear pending bit to resume */
+
+	temp = IICCON & ~(S3C44B0X_rIIC_INTPEND);
+	IICCON = temp;
+
+	/* wait and check ACK */
+	for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) {
+		temp = IICCON;
+		if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND)
+		break;
+		udelay(2000);
+	}
+	if (k==S3C44B0_IIC_TIMEOUT)
+		return -1;
+
+
+		buffer[j] = IICDS; /*save readed data*/
+
+    } /*end for(j)*/
+
+	/*
+		reading the last data
+		unset ACK generation
+	*/
+	temp = IICCON & ~(S3C44B0X_rIIC_INTPEND | (1<<7));
+	IICCON = temp;
+
+	/* wait but NOT check ACK */
+	for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) {
+		temp = IICCON;
+		if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND)
+		break;
+		udelay(2000);
+	}
+	if (k==S3C44B0_IIC_TIMEOUT)
+		return -1;
+
+	buffer[j] = IICDS; /*save readed data*/
+
+	rIICSTAT = 0x90; /*master recv*/
+
+	/* Write operation Terminate sending STOP */
+	IICSTAT = rIICSTAT;
+	/*Clear Int Pending Bit to RESUME*/
+	temp = IICCON;
+	IICCON = temp & (~S3C44B0X_rIIC_INTPEND);
+
+	IICCON = IICCON | (1<<7);	/*restore ACK generation*/
+
+	return 0;
+}
+
+int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
+{
+	int j, k;
+	u32 rIICSTAT, temp;
+
+
+	/*
+		send the device offset
+	*/
+
+	rIICSTAT = 0xD0;
+	IICSTAT = rIICSTAT;
+
+	IICDS = chip;	/* this is a write operation... */
+
+	rIICSTAT |= (1<<5);
+	IICSTAT = rIICSTAT;
+
+	IICCON = IICCON & ~(S3C44B0X_rIIC_INTPEND);
+
+	/* wait and check ACK */
+	for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) {
+		temp = IICCON;
+		if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND)
+		break;
+		udelay(2000);
+	}
+	if (k==S3C44B0_IIC_TIMEOUT)
+		return -1;
+
+	temp = IICSTAT;
+	if ((temp & S3C44B0X_rIIC_LAST_RECEIV_BIT) == S3C44B0X_rIIC_LAST_RECEIV_BIT )
+		return -1;
+
+	IICDS = addr;
+	IICCON = IICCON & ~(S3C44B0X_rIIC_INTPEND);
+
+	/* wait and check ACK */
+	for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) {
+		temp = IICCON;
+		if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND)
+		break;
+		udelay(2000);
+	}
+	if (k==S3C44B0_IIC_TIMEOUT)
+	  return -1;
+
+	temp = IICSTAT;
+	if ((temp & S3C44B0X_rIIC_LAST_RECEIV_BIT) == S3C44B0X_rIIC_LAST_RECEIV_BIT )
+		return -1;
+
+	/*
+		now we can start with the read write operation
+	*/
+	for (j=0; j<len; j++) {
+
+		IICDS = buffer[j]; /*prerare data to write*/
+
+		/*clear pending bit to resume*/
+
+		temp = IICCON & ~(S3C44B0X_rIIC_INTPEND);
+		IICCON = temp;
+
+		/* wait but NOT check ACK */
+		for(k=0; k<S3C44B0_IIC_TIMEOUT; k++) {
+			temp = IICCON;
+			if( (temp & S3C44B0X_rIIC_INTPEND) == S3C44B0X_rIIC_INTPEND)
+			break;
+
+			udelay(2000);
+		}
+
+		if (k==S3C44B0_IIC_TIMEOUT)
+			return -1;
+
+	} /* end for(j) */
+
+	/* sending stop to terminate */
+	rIICSTAT = 0xD0;  /*master send*/
+	IICSTAT = rIICSTAT;
+	/*Clear Int Pending Bit to RESUME*/
+	temp = IICCON;
+	IICCON = temp & (~S3C44B0X_rIIC_INTPEND);
+
+	return 0;
+}
diff --git a/cpu/s3c44b0/interrupts.c b/cpu/s3c44b0/interrupts.c
new file mode 100644
index 0000000000..4328feb4e3
--- /dev/null
+++ b/cpu/s3c44b0/interrupts.c
@@ -0,0 +1,235 @@
+/*
+ * (C) Copyright 2004
+ * DAVE Srl
+ * http://www.dave-tech.it
+ * http://www.wawnet.biz
+ * mailto:info@wawnet.biz
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <asm/hardware.h>
+
+#include <asm/proc-armv/ptrace.h>
+
+extern void reset_cpu(ulong addr);
+
+/* we always count down the max. */
+#define TIMER_LOAD_VAL 0xffff
+
+/* macro to read the 16 bit timer */
+#define READ_TIMER (TCNTO1 & 0xffff)
+
+#ifdef CONFIG_USE_IRQ
+#error CONFIG_USE_IRQ NOT supported
+#else
+void enable_interrupts (void)
+{
+	return;
+}
+int disable_interrupts (void)
+{
+	return 0;
+}
+#endif
+
+
+void bad_mode (void)
+{
+	panic ("Resetting CPU ...\n");
+	reset_cpu (0);
+}
+
+void show_regs (struct pt_regs *regs)
+{
+	unsigned long flags;
+	const char *processor_modes[] =
+		{ "USER_26", "FIQ_26", "IRQ_26", "SVC_26", "UK4_26", "UK5_26",
+				"UK6_26", "UK7_26",
+		"UK8_26", "UK9_26", "UK10_26", "UK11_26", "UK12_26", "UK13_26",
+				"UK14_26", "UK15_26",
+		"USER_32", "FIQ_32", "IRQ_32", "SVC_32", "UK4_32", "UK5_32",
+				"UK6_32", "ABT_32",
+		"UK8_32", "UK9_32", "UK10_32", "UND_32", "UK12_32", "UK13_32",
+				"UK14_32", "SYS_32"
+	};
+
+	flags = condition_codes (regs);
+
+	printf ("pc : [<%08lx>]    lr : [<%08lx>]\n"
+			"sp : %08lx  ip : %08lx  fp : %08lx\n",
+			instruction_pointer (regs),
+			regs->ARM_lr, regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
+	printf ("r10: %08lx  r9 : %08lx  r8 : %08lx\n",
+			regs->ARM_r10, regs->ARM_r9, regs->ARM_r8);
+	printf ("r7 : %08lx  r6 : %08lx  r5 : %08lx  r4 : %08lx\n",
+			regs->ARM_r7, regs->ARM_r6, regs->ARM_r5, regs->ARM_r4);
+	printf ("r3 : %08lx  r2 : %08lx  r1 : %08lx  r0 : %08lx\n",
+			regs->ARM_r3, regs->ARM_r2, regs->ARM_r1, regs->ARM_r0);
+	printf ("Flags: %c%c%c%c",
+			flags & CC_N_BIT ? 'N' : 'n',
+			flags & CC_Z_BIT ? 'Z' : 'z',
+			flags & CC_C_BIT ? 'C' : 'c', flags & CC_V_BIT ? 'V' : 'v');
+	printf ("  IRQs %s  FIQs %s  Mode %s%s\n",
+			interrupts_enabled (regs) ? "on" : "off",
+			fast_interrupts_enabled (regs) ? "on" : "off",
+			processor_modes[processor_mode (regs)],
+			thumb_mode (regs) ? " (T)" : "");
+}
+
+void do_undefined_instruction (struct pt_regs *pt_regs)
+{
+	printf ("undefined instruction\n");
+	show_regs (pt_regs);
+	bad_mode ();
+}
+
+void do_software_interrupt (struct pt_regs *pt_regs)
+{
+	printf ("software interrupt\n");
+	show_regs (pt_regs);
+	bad_mode ();
+}
+
+void do_prefetch_abort (struct pt_regs *pt_regs)
+{
+	printf ("prefetch abort\n");
+	show_regs (pt_regs);
+	bad_mode ();
+}
+
+void do_data_abort (struct pt_regs *pt_regs)
+{
+	printf ("data abort\n");
+	show_regs (pt_regs);
+	bad_mode ();
+}
+
+void do_not_used (struct pt_regs *pt_regs)
+{
+	printf ("not used\n");
+	show_regs (pt_regs);
+	bad_mode ();
+}
+
+void do_fiq (struct pt_regs *pt_regs)
+{
+	printf ("fast interrupt request\n");
+	show_regs (pt_regs);
+	bad_mode ();
+}
+
+void do_irq (struct pt_regs *pt_regs)
+{
+	printf ("interrupt request\n");
+	show_regs (pt_regs);
+	bad_mode ();
+}
+
+static ulong timestamp;
+static ulong lastdec;
+
+int interrupt_init (void)
+{
+	TCFG0 = 0x000000E9;
+	TCFG1 = 0x00000004;
+	TCON = 0x00000900;
+	TCNTB1 = TIMER_LOAD_VAL;
+	TCMPB1 = 0;
+	TCON = 0x00000B00;
+	TCON = 0x00000900;
+
+
+	lastdec = TCNTB1 = TIMER_LOAD_VAL;
+	timestamp = 0;
+	return 0;
+}
+
+/*
+ * timer without interrupts
+ */
+
+void reset_timer (void)
+{
+	reset_timer_masked ();
+}
+
+ulong get_timer (ulong base)
+{
+	return get_timer_masked () - base;
+}
+
+void set_timer (ulong t)
+{
+	timestamp = t;
+}
+
+void udelay (unsigned long usec)
+{
+	ulong tmo;
+
+	tmo = usec / 1000;
+	tmo *= CFG_HZ;
+	tmo /= 8;
+
+	tmo += get_timer (0);
+
+	while (get_timer_masked () < tmo)
+		/*NOP*/;
+}
+
+void reset_timer_masked (void)
+{
+	/* reset time */
+	lastdec = READ_TIMER;
+	timestamp = 0;
+}
+
+ulong get_timer_masked (void)
+{
+	ulong now = READ_TIMER;
+
+	if (lastdec >= now) {
+		/* normal mode */
+		timestamp += lastdec - now;
+	} else {
+		/* we have an overflow ... */
+		timestamp += lastdec + TIMER_LOAD_VAL - now;
+	}
+	lastdec = now;
+
+	return timestamp;
+}
+
+void udelay_masked (unsigned long usec)
+{
+	ulong tmo;
+
+	tmo = usec / 1000;
+	tmo *= CFG_HZ;
+	tmo /= 8;
+
+	tmo += get_timer (0);
+
+	reset_timer_masked ();
+
+	while (get_timer_masked () < tmo)
+		/*NOP*/;
+}
diff --git a/cpu/s3c44b0/serial.c b/cpu/s3c44b0/serial.c
new file mode 100644
index 0000000000..61ccfc7a2b
--- /dev/null
+++ b/cpu/s3c44b0/serial.c
@@ -0,0 +1,218 @@
+/*
+ * (C) Copyright 2004
+ * DAVE Srl
+ * http://www.dave-tech.it
+ * http://www.wawnet.biz
+ * mailto:info@wawnet.biz
+ *
+ * (C) Copyright 2002-2004
+ * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Alex Zuepke <azu@sysgo.de>
+ *
+ * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
+ *
+ * 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 program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <common.h>
+#include <asm/hardware.h>
+
+/* flush serial input queue. returns 0 on success or negative error
+ * number otherwise
+ */
+static int serial_flush_input(void)
+{
+	volatile u32 tmp;
+
+	/* keep on reading as long as the receiver is not empty */
+	while(UTRSTAT0&0x01) {
+		tmp = REGB(URXH0);
+	}
+
+	return 0;
+}
+
+
+/* flush output queue. returns 0 on success or negative error number
+ * otherwise
+ */
+static int serial_flush_output(void)
+{
+	/* wait until the transmitter is no longer busy */
+	while(!(UTRSTAT0 & 0x02)) {
+	}
+
+	return 0;
+}
+
+
+void serial_setbrg (void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	u32 divisor = 0;
+
+	/* get correct divisor */
+	switch(gd->baudrate) {
+
+	case 1200:
+#if CONFIG_S3C44B0_CLOCK_SPEED==66
+		divisor = 3124;
+#elif CONFIG_S3C44B0_CLOCK_SPEED==75
+		divisor = 3905;
+#else
+# error CONFIG_S3C44B0_CLOCK_SPEED undefined
+#endif
+		break;
+
+	case 9600:
+#if CONFIG_S3C44B0_CLOCK_SPEED==66
+		divisor = 390;
+#elif CONFIG_S3C44B0_CLOCK_SPEED==75
+		divisor = 487;
+#else
+# error CONFIG_S3C44B0_CLOCK_SPEED undefined
+#endif
+		break;
+
+	case 19200:
+#if CONFIG_S3C44B0_CLOCK_SPEED==66
+		divisor = 194;
+#elif CONFIG_S3C44B0_CLOCK_SPEED==75
+		divisor = 243;
+#else
+# error CONFIG_S3C44B0_CLOCK_SPEED undefined
+#endif
+		break;
+
+	case 38400:
+#if CONFIG_S3C44B0_CLOCK_SPEED==66
+		divisor = 97;
+#elif CONFIG_S3C44B0_CLOCK_SPEED==75
+		divisor = 121;
+#else
+# error CONFIG_S3C44B0_CLOCK_SPEED undefined
+#endif		break;
+
+	case 57600:
+#if CONFIG_S3C44B0_CLOCK_SPEED==66
+		divisor = 64;
+#elif CONFIG_S3C44B0_CLOCK_SPEED==75
+		divisor = 80;
+#else
+# error CONFIG_S3C44B0_CLOCK_SPEED undefined
+#endif		break;
+
+	case 115200:
+#if CONFIG_S3C44B0_CLOCK_SPEED==66
+		divisor = 32;
+#elif CONFIG_S3C44B0_CLOCK_SPEED==75
+		divisor = 40;
+#else
+# error CONFIG_S3C44B0_CLOCK_SPEED undefined
+#endif		break;
+	}
+
+	serial_flush_output();
+	serial_flush_input();
+	UFCON0 = 0x0;
+	ULCON0 = 0x03;
+	UCON0 = 0x05;
+	UBRDIV0 = divisor;
+
+	UFCON1 = 0x0;
+	ULCON1 = 0x03;
+	UCON1 = 0x05;
+	UBRDIV1 = divisor;
+
+	for(divisor=0; divisor<100; divisor++) {
+		/* NOP */
+	}
+}
+
+
+/*
+ * Initialise the serial port with the given baudrate. The settings
+ * are always 8 data bits, no parity, 1 stop bit, no start bits.
+ *
+ */
+int serial_init (void)
+{
+	serial_setbrg ();
+
+	return (0);
+}
+
+
+/*
+ * Output a single byte to the serial port.
+ */
+void serial_putc (const char c)
+{
+	/* wait for room in the transmit FIFO */
+	while(!(UTRSTAT0 & 0x02));
+
+	UTXH0 = (unsigned char)c;
+
+	/*
+		to be polite with serial console add a line feed
+		to the carriage return character
+	*/
+	if (c=='\n')
+		serial_putc('\r');
+}
+
+/*
+ * Read a single byte from the serial port. Returns 1 on success, 0
+ * otherwise. When the function is succesfull, the character read is
+ * written into its argument c.
+ */
+int serial_tstc (void)
+{
+	return (UTRSTAT0 & 0x01);
+}
+
+/*
+ * Read a single byte from the serial port. Returns 1 on success, 0
+ * otherwise. When the function is succesfull, the character read is
+ * written into its argument c.
+ */
+int serial_getc (void)
+{
+	int rv;
+
+	for(;;) {
+		rv = serial_tstc();
+
+		if(rv > 0)
+			return URXH0;
+	}
+}
+
+void
+serial_puts (const char *s)
+{
+	while (*s) {
+		serial_putc (*s++);
+	}
+}
diff --git a/cpu/s3c44b0/start.S b/cpu/s3c44b0/start.S
new file mode 100644
index 0000000000..ce31ec935d
--- /dev/null
+++ b/cpu/s3c44b0/start.S
@@ -0,0 +1,271 @@
+/*
+ * Startup Code for S3C44B0 CPU-core
+ *
+ * (C) Copyright 2004
+ * DAVE Srl
+ *
+ * http://www.dave-tech.it
+ * http://www.wawnet.biz
+ * mailto:info@wawnet.biz
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+
+#include <config.h>
+#include <version.h>
+
+
+/*
+ * Jump vector table
+ */
+
+
+.globl _start
+_start:	b       reset
+	add	pc, pc, #0x0c000000
+	add	pc, pc, #0x0c000000
+	add	pc, pc, #0x0c000000
+	add	pc, pc, #0x0c000000
+	add	pc, pc, #0x0c000000
+	add	pc, pc, #0x0c000000
+	add	pc, pc, #0x0c000000
+
+	.balignl 16,0xdeadbeef
+
+
+/*
+ *************************************************************************
+ *
+ * Startup Code (reset vector)
+ *
+ * do important init only if we don't start from memory!
+ * relocate u-boot to ram
+ * setup stack
+ * jump to second stage
+ *
+ *************************************************************************
+ */
+
+_TEXT_BASE:
+	.word	TEXT_BASE
+
+.globl _armboot_start
+_armboot_start:
+	.word _start
+
+/*
+ * Note: _armboot_end_data and _armboot_end are defined
+ * by the (board-dependent) linker script.
+ * _armboot_end_data is the first usable FLASH address after armboot
+ */
+.globl _armboot_end_data
+_armboot_end_data:
+	.word armboot_end_data
+.globl _armboot_end
+_armboot_end:
+	.word armboot_end
+
+#ifdef CONFIG_USE_IRQ
+/* IRQ stack memory (calculated at run-time) */
+.globl IRQ_STACK_START
+IRQ_STACK_START:
+	.word	0x0badc0de
+
+/* IRQ stack memory (calculated at run-time) */
+.globl FIQ_STACK_START
+FIQ_STACK_START:
+	.word 0x0badc0de
+#endif
+
+
+/*
+ * the actual reset code
+ */
+
+reset:
+	/*
+	 * set the cpu to SVC32 mode
+	 */
+	mrs	r0,cpsr
+	bic	r0,r0,#0x1f
+	orr	r0,r0,#0x13
+	msr	cpsr,r0
+
+	/*
+	 * we do sys-critical inits only at reboot,
+	 * not when booting from ram!
+	 */
+
+#ifdef CONFIG_INIT_CRITICAL
+	bl	cpu_init_crit
+	/*
+	 * before relocating, we have to setup RAM timing
+	 * because memory timing is board-dependend, you will
+	 * find a memsetup.S in your board directory.
+	 */
+	bl	memsetup
+#endif
+
+relocate:				/* relocate U-Boot to RAM	    */
+	adr	r0, _start		/* r0 <- current position of code   */
+	ldr	r1, _TEXT_BASE		/* test if we run from flash or RAM */
+	cmp     r0, r1                  /* don't reloc during debug         */
+	beq     stack_setup
+
+	ldr	r2, _armboot_start
+	ldr	r3, _armboot_end
+	sub	r2, r3, r2		/* r2 <- size of armboot            */
+	add	r2, r0, r2		/* r2 <- source end address         */
+
+copy_loop:
+	ldmia	r0!, {r3-r10}		/* copy from source address [r0]    */
+	stmia	r1!, {r3-r10}		/* copy to   target address [r1]    */
+	cmp	r0, r2			/* until source end addreee [r2]    */
+	ble	copy_loop
+
+/*
+	now copy to sram the interrupt vector
+*/
+	adr	r0, real_vectors
+	add	r2, r0, #1024
+	ldr	r1, =0x0c000000
+	add	r1, r1, #0x08
+vector_copy_loop:
+	ldmia	r0!, {r3-r10}
+	stmia	r1!, {r3-r10}
+	cmp	r0, r2
+	ble	vector_copy_loop
+
+	/* Set up the stack						    */
+stack_setup:
+	ldr	r0, _TEXT_BASE		/* upper 128 KiB: relocated uboot   */
+	sub	r0, r0, #CFG_MALLOC_LEN	/* malloc area                      */
+	sub	r0, r0, #CFG_GBL_DATA_SIZE /* bdinfo                        */
+#ifdef CONFIG_USE_IRQ
+	sub	r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ)
+#endif
+	sub	sp, r0, #12		/* leave 3 words for abort-stack    */
+
+	ldr	pc, _start_armboot
+
+_start_armboot:	.word start_armboot
+
+
+/*
+ *************************************************************************
+ *
+ * CPU_init_critical registers
+ *
+ * setup important registers
+ * setup memory timing
+ *
+ *************************************************************************
+ */
+
+#define INTCON (0x01c00000+0x200000)
+#define INTMSK (0x01c00000+0x20000c)
+#define LOCKTIME (0x01c00000+0x18000c)
+#define PLLCON (0x01c00000+0x180000)
+#define CLKCON (0x01c00000+0x180004)
+#define WTCON (0x01c00000+0x130000)
+cpu_init_crit:
+	/* disable watch dog */
+	ldr 	r0, =WTCON
+	ldr	r1, =0x0
+	str	r1, [r0]
+
+	/*
+	 * mask all IRQs by clearing all bits in the INTMRs
+	 */
+	ldr	r1,=INTMSK
+	ldr	r0, =0x03fffeff
+	str	r0, [r1]
+
+	ldr	r1, =INTCON
+	ldr	r0, =0x05
+	str	r0, [r1]
+
+	/* Set Clock Control Register */
+	ldr	r1, =LOCKTIME
+	ldrb	r0, =800
+	strb	r0, [r1]
+
+	ldr	r1, =PLLCON
+
+#if CONFIG_S3C44B0_CLOCK_SPEED==66
+	ldr	r0, =0x34031 	/* 66MHz (Quartz=11MHz) */
+#elif CONFIG_S3C44B0_CLOCK_SPEED==75
+	ldr	r0, =0x610c1 /*B2: Xtal=20mhz Fclk=75MHz  */
+#else
+# error CONFIG_S3C44B0_CLOCK_SPEED undefined
+#endif
+
+	str	r0, [r1]
+
+	ldr	r1,=CLKCON
+	ldr	r0, =0x7ff8
+	str	r0, [r1]
+
+	mov	pc, lr
+
+
+/*************************************************/
+/*	interrupt vectors	*/
+/*************************************************/
+real_vectors:
+	b	reset
+	b	undefined_instruction
+	b	software_interrupt
+	b	prefetch_abort
+	b	data_abort
+	b	not_used
+	b	irq
+	b	fiq
+
+/*************************************************/
+
+undefined_instruction:
+	mov	r6, #3
+	b	reset
+
+software_interrupt:
+	mov	r6, #4
+	b	reset
+
+prefetch_abort:
+	mov	r6, #5
+	b	reset
+
+data_abort:
+	mov	r6, #6
+	b	reset
+
+not_used:
+	/* we *should* never reach this */
+	mov	r6, #7
+	b	reset
+
+irq:
+	mov	r6, #8
+	b	reset
+
+fiq:
+	mov	r6, #9
+	b	reset