Add the board directory for SMN42

1 files changed, 123 insertions, 0 deletions

diff --git a/board/siemens/SMN42/lowlevel_init.S b/board/siemens/SMN42/lowlevel_init.S
new file mode 100644
index 0000000..11abb63
--- /dev/null
+++ b/board/siemens/SMN42/lowlevel_init.S
@@ -0,0 +1,123 @@
+/*
+ * (C) Copyright 2006 Embedded Artists AB <www.embeddedartists.com>
+ *
+ * Slight modifications made to support the SMN42 board from Siemens.
+ * 2007 Gary Jennejohn garyj@denx.de
+ *
+ * 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>
+#include <asm/arch/hardware.h>
+
+/* some parameters for the board */
+/* setting up the CPU-internal memory */
+#define 	SRAM_START 	0x40000000
+#define 	SRAM_SIZE	0x00004000
+#define   BCFG0_VALUE 0x1000ffef
+#define   BCFG1_VALUE 0x10005D2F
+#define   BCFG2_VALUE 0x10005D2F
+/*
+ * For P0.18 to set ZZ to the SRAMs to 1. Also set P0.2 (SCL) and P0.3 (SDA)
+ * for the bit-banger I2C driver correctly.
+ */
+#define   IO0_VALUE   0x4000C
+
+_TEXT_BASE:
+	.word	TEXT_BASE
+MEMMAP_ADR:
+	.word	MEMMAP
+BCFG0_ADR:
+	.word BCFG0
+_BCFG0_VALUE:
+	.word BCFG0_VALUE
+BCFG1_ADR:
+	.word	BCFG1
+_BCFG1_VALUE:
+	.word	BCFG1_VALUE
+BCFG2_ADR:
+	.word	BCFG2
+_BCFG2_VALUE:
+	.word	BCFG2_VALUE
+IO0DIR_ADR:
+	.word	IO0DIR
+_IO0DIR_VALUE:
+	.word	IO0_VALUE
+IO0SET_ADR:
+	.word	IO0SET
+_IO0SET_VALUE:
+	.word	IO0_VALUE
+PINSEL2_ADR:
+	.word	PINSEL2
+PINSEL2_MASK:
+	.word	0x00000000
+PINSEL2_VALUE:
+	.word	0x0F804914
+
+.extern _start
+
+.globl lowlevel_init
+lowlevel_init:
+	/* set up memory control register for bank 0 */
+	ldr r0, _BCFG0_VALUE
+	ldr r1, BCFG0_ADR
+	str r0, [r1]
+
+	/* set up memory control register for bank 1 */
+	ldr	r0, _BCFG1_VALUE
+	ldr	r1, BCFG1_ADR
+	str	r0, [r1]
+
+	/* set up memory control register for bank 2 */
+	ldr	r0, _BCFG2_VALUE
+	ldr	r1, BCFG2_ADR
+	str	r0, [r1]
+
+	/* set IO0DIR to make P0.2, P0.3  and P0.18 outputs */
+	ldr	r0, _IO0DIR_VALUE
+	ldr	r1, IO0DIR_ADR
+	str	r0, [r1]
+
+	/* set P0.18 to 1 */
+	ldr	r0, _IO0SET_VALUE
+	ldr	r1, IO0SET_ADR
+	str	r0, [r1]
+
+	/* set up PINSEL2 for bus-pins */
+	ldr	r0, PINSEL2_ADR
+	ldr	r1, [r0]
+	ldr	r2, PINSEL2_MASK
+	ldr	r3, PINSEL2_VALUE
+	and	r1, r1, r2
+	orr	r1, r1, r3
+	str	r1, [r0]
+
+	/* move vectors to beginning of SRAM */
+	mov	r2, #SRAM_START
+	mov	r0, #0 /*_start*/
+	ldmneia r0!, {r3-r10}
+	stmneia r2!, {r3-r10}
+	ldmneia r0, {r3-r9}
+	stmneia r2, {r3-r9}
+
+	/* Set-up MEMMAP register, so vectors are taken from SRAM */
+	ldr	r0, MEMMAP_ADR
+	mov	r1, #0x02	/* vectors re-mapped to static RAM */
+	str	r1, [r0]
+
+	/* everything is fine now */
+	mov	pc, lr