diff --git a/arch/sparc/cpu/leon3/Makefile b/arch/sparc/cpu/leon3/Makefile
index 1d051e1..95bbfc9 100644
--- a/arch/sparc/cpu/leon3/Makefile
+++ b/arch/sparc/cpu/leon3/Makefile
@@ -2,23 +2,7 @@
 # (C) Copyright 2003-2006
 # 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
+# SPDX-License-Identifier:	GPL-2.0+
 #
 
 include $(TOPDIR)/config.mk
diff --git a/arch/sparc/cpu/leon3/ambapp.c b/arch/sparc/cpu/leon3/ambapp.c
index efd41ae..a30d1f2 100644
--- a/arch/sparc/cpu/leon3/ambapp.c
+++ b/arch/sparc/cpu/leon3/ambapp.c
@@ -5,23 +5,7 @@
  * (C) Copyright 2007
  * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com
  *
- * 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
+ * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <common.h>
diff --git a/arch/sparc/cpu/leon3/config.mk b/arch/sparc/cpu/leon3/config.mk
index 30b224a..f9b0d34 100644
--- a/arch/sparc/cpu/leon3/config.mk
+++ b/arch/sparc/cpu/leon3/config.mk
@@ -2,23 +2,7 @@
 # (C) Copyright 2003
 # 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
+# SPDX-License-Identifier:	GPL-2.0+
 #
 
 PLATFORM_RELFLAGS += -fPIC
diff --git a/arch/sparc/cpu/leon3/cpu.c b/arch/sparc/cpu/leon3/cpu.c
index a1646e2..8ab3150 100644
--- a/arch/sparc/cpu/leon3/cpu.c
+++ b/arch/sparc/cpu/leon3/cpu.c
@@ -3,23 +3,7 @@
  * (C) Copyright 2007
  * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com
  *
- * 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
+ * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <common.h>
diff --git a/arch/sparc/cpu/leon3/cpu_init.c b/arch/sparc/cpu/leon3/cpu_init.c
index cba9d0e..4720f42 100644
--- a/arch/sparc/cpu/leon3/cpu_init.c
+++ b/arch/sparc/cpu/leon3/cpu_init.c
@@ -4,24 +4,7 @@
  * (C) Copyright 2007
  * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com
  *
- * 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
- *
+ * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <common.h>
diff --git a/arch/sparc/cpu/leon3/interrupts.c b/arch/sparc/cpu/leon3/interrupts.c
index 4a3847d..a834aa0 100644
--- a/arch/sparc/cpu/leon3/interrupts.c
+++ b/arch/sparc/cpu/leon3/interrupts.c
@@ -11,23 +11,7 @@
  * (C) Copyright 2001
  * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
  *
- * 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
+ * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <asm/stack.h>
diff --git a/arch/sparc/cpu/leon3/prom.c b/arch/sparc/cpu/leon3/prom.c
index 1bd28d4..b83776b 100644
--- a/arch/sparc/cpu/leon3/prom.c
+++ b/arch/sparc/cpu/leon3/prom.c
@@ -4,24 +4,7 @@
  * Copyright (C) 2004 Stefan Holst <mail@s-holst.de>
  * Copyright (C) 2007 Daniel Hellstrom <daniel@gaisler.com>
  *
- * 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
- *
+ * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <common.h>
diff --git a/arch/sparc/cpu/leon3/serial.c b/arch/sparc/cpu/leon3/serial.c
index af9ce55..bca6b65 100644
--- a/arch/sparc/cpu/leon3/serial.c
+++ b/arch/sparc/cpu/leon3/serial.c
@@ -3,24 +3,7 @@
  * (C) Copyright 2007
  * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com.
  *
- * 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
- *
+ * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <common.h>
diff --git a/arch/sparc/cpu/leon3/start.S b/arch/sparc/cpu/leon3/start.S
index 1e393a5..70aee78 100644
--- a/arch/sparc/cpu/leon3/start.S
+++ b/arch/sparc/cpu/leon3/start.S
@@ -1,54 +1,31 @@
-/* This is where the SPARC/LEON3 starts
- * Copyright (C) 2007,
- * Daniel Hellstrom, daniel@gaisler.com
- *
- * 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
- */
+TRAP ta 0; nop; nop; nop;
 
-#include <asm-offsets.h>
-#include <config.h>
-#include <asm/asmmacro.h>
-#include <asm/winmacro.h>
-#include <asm/psr.h>
-#include <asm/stack.h>
-#include <asm/leon.h>
-#include <version.h>
+/* Software trap. Treat as BAD_TRAP for the time being... */
+#define SOFT_TRAP TRAP(_hwerr)
 
-/* Entry for traps which jump to a programmer-specified trap handler.  */
-#define TRAPR(H)  \
-	wr	%g0, 0xfe0, %psr; \
-	mov	%g0, %tbr; \
-	ba	(H); \
-	mov	%g0, %wim;
+#define PSR_INIT   0x1FC0	/* Disable traps, set s and ps */
+#define WIM_INIT   2
 
-#define TRAP(H) \
-	mov	%psr, %l0; \
-	ba	(H); \
-	nop; nop;
+/* All traps low-level code here must end with this macro. */
+#define RESTORE_ALL b ret_trap_entry; clr %l6;
 
-#define TRAPI(ilevel) \
-	mov	ilevel, %l7; \
-	mov	%psr, %l0; \
-	b	_irq_entry; \
-	mov	%wim, %l3
+#define WRITE_PAUSE nop;nop;nop
 
-/* Unexcpected trap will halt the processor by forcing it to error state */
+WINDOWSIZE = (16 * 4)
+ARGPUSHSIZE = (6 * 4)
+ARGPUSH = (WINDOWSIZE + 4)
+MINFRAME = (WINDOWSIZE + ARGPUSHSIZE + 4)
+
+/* Number of register windows */
+#ifndef CONFIG_SYS_SPARC_NWINDOWS
+#error Must define number of SPARC register windows, default is 8
+#endif
+
+#define STACK_ALIGN	8
+#define SA(X)	(((X)+(STACK_ALIGN-1)) & ~(STACK_ALIGN-1))
+
+	.section ".start", "ax"
+	.globl	_starttate */
 #undef BAD_TRAP
 #define BAD_TRAP ta 0; nop; nop; nop;
 
diff --git a/arch/sparc/cpu/leon3/usb_uhci.c b/arch/sparc/cpu/leon3/usb_uhci.c
index b3b8a4d..5de48c1 100644
--- a/arch/sparc/cpu/leon3/usb_uhci.c
+++ b/arch/sparc/cpu/leon3/usb_uhci.c
@@ -24,25 +24,7 @@
  *     Added AMBA Plug&Play detection of GRUSB, modified interrupt handler.
  *     Added cache flushes where needed.
  *
- * 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
- *
- *
+ * SPDX-License-Identifier:	GPL-2.0+
  */
 
 /**********************************************************************
diff --git a/arch/sparc/cpu/leon3/usb_uhci.h b/arch/sparc/cpu/leon3/usb_uhci.h
index bf572a6..034814a 100644
--- a/arch/sparc/cpu/leon3/usb_uhci.h
+++ b/arch/sparc/cpu/leon3/usb_uhci.h
@@ -2,26 +2,9 @@
  * (C) Copyright 2001
  * Denis Peter, MPL AG Switzerland
  *
- * 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
+ * SPDX-License-Identifier:	GPL-2.0+
  *
  * Note: Part of this code has been derived from linux
- *
  */
 #ifndef _USB_UHCI_H_
 #define _USB_UHCI_H_