1 files changed, 85 insertions, 0 deletions
diff --git a/board/impa7/lowlevel_init.S b/board/impa7/lowlevel_init.S
new file mode 100644
index 0000000..7ce10a2
--- /dev/null
+++ b/board/impa7/lowlevel_init.S
@@ -0,0 +1,85 @@
+/*
+ * Memory Setup stuff - taken from ???
+ *
+ * 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>
+
+
+/* some parameters for the board */
+
+SYSCON2:	.long	0x80001100
+MEMCFG1:	.long	0x80000180
+MEMCFG2:	.long	0x800001C0
+DRFPR:		.long	0x80000200
+
+syscon2_mask:	.long	0x00000004
+memcfg1_val:	.long	0x160c1414
+memcfg2_mask:	.long	0x0000ffff @ only set lower 16 bits
+memcfg2_val:	.long	0x00000000 @ upper 16 bits are reserved for CS7 + CS6
+drfpr_val:	.long	0x00000081
+/* setting up the memory */
+
+.globl lowlevel_init
+lowlevel_init:
+	/*
+	 * DRFPR
+	 * 64kHz DRAM refresh
+	 */
+	ldr	r0, DRFPR
+	ldr	r1, drfpr_val
+	str	r1, [r0]
+
+	/*
+	 * SYSCON2: clear bit 2, DRAM is 32 bits wide
+	 */
+	ldr	r0, SYSCON2
+	ldr	r2, [r0]
+	ldr	r1, syscon2_mask
+	bic	r2, r2, r1
+	str	r2, [r0]
+
+	/*
+	 * MEMCFG1
+	 * Setting up Keyboard at CS3, 8 Bit, 3 Waitstates
+	 * Setting up CS8900 (Ethernet) at CS2, 32 Bit, 5 Waitstates
+	 * Setting up flash at CS0 and CS1, 32 Bit, 3 Waitstates
+	 */
+	ldr	r0, MEMCFG1
+	ldr	r1, memcfg1_val
+	str	r1, [r0]
+
+	/*
+	 * MEMCFG2
+	 * Setting up ? with 0
+	 *
+	 */
+	ldr	r0, MEMCFG2
+	ldr	r2, [r0]
+	ldr	r1, memcfg2_mask
+	bic	r2, r2, r1
+	ldr	r1, memcfg2_val
+	orr	r2, r2, r1
+	str	r2, [r0]
+
+	/* everything is fine now */
+	mov	pc, lr