Prepare for SoC rework of ARM code:

- rename CONFIG_BOOTBINFUNC into  CONFIG_INIT_CRITICAL
- rename memsetup into lowlevel_init (function name and source files)

1 files changed, 77 insertions, 0 deletions

diff --git a/board/gcplus/lowlevel_init.S b/board/gcplus/lowlevel_init.S
new file mode 100644
index 0000000..f292c4d
--- /dev/null
+++ b/board/gcplus/lowlevel_init.S
@@ -0,0 +1,77 @@
+/*
+ * Memory Setup stuff - taken from blob memsetup.S
+ *
+ * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl) and
+ *                     Jan-Derk Bakker (J.D.Bakker@its.tudelft.nl)
+ * 2003-2004 (c) MontaVista Software, 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
+ */
+
+
+#include "config.h"
+#include "version.h"
+
+
+	.globl	lowlevel_init
+lowlevel_init:
+	/* The ADS GC+ for Linux Boot Rom Ver. 1.73 does memory init for us.
+	 * However the darn thing leaves the MMU enabled before handing control
+	 * over to us. So we need to disable the MMU and we use lowlevel_init
+	 * to do it.
+	 */
+
+@ The following code segment was borrowed with gratitude from:
+@	linux-2.4.19-rmk7/arch/arm/boot/compressed/head-sa1100.S
+
+	@ Data cache might be active.
+	@ Be sure to flush kernel binary out of the cache,
+	@ whatever state it is, before it is turned off.
+	@ This is done by fetching through currently executed
+	@ memory to be sure we hit the same cache.
+	bic	r2, pc, #0x1f
+	add	r3, r2, #0x4000		@ 16 kb is quite enough...
+1:	ldr	r0, [r2], #32
+	teq	r2, r3
+	bne	1b
+	mcr	p15, 0, r0, c7, c10, 4	@ drain WB
+	mcr	p15, 0, r0, c7, c7, 0	@ flush I & D caches
+
+	@ disabling MMU and caches
+	mrc	p15, 0, r0, c1, c0, 0	@ read control reg
+	bic	r0, r0, #0x0d		@ clear WB, DC, MMU
+	bic	r0, r0, #0x1000		@ clear Icache
+	mcr	p15, 0, r0, c1, c0, 0
+
+	nop
+	nop
+	nop
+	nop
+	nop
+
+	b	2f
+2:
+	nop
+	nop
+	nop
+	nop
+	nop
+
+
+	mov	pc, lr