replace the ugly rb532 cmdline hack with a cleaner one that does not depend on magic offsets

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@5699 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/rb532-2.6/base-files.mk

@@ -0,0 +1,11 @@
+define Build/Compile
+	$(call Build/Compile/Default)
+	$(TARGET_CC) -o $(PKG_BUILD_DIR)/patch-cmdline $(PLATFORM_DIR)/src/patch-cmdline.c
+endef
+
+define Package/base-files/install-target
+	mkdir -p $(1)/sbin
+	$(CP) $(PKG_BUILD_DIR)/patch-cmdline $(1)/sbin
+endef
+
+

target/linux/rb532-2.6/base-files/sbin/cf2nand

@@ -6,13 +6,8 @@ copy_kernel() {
 	local output="$2"
 	local cmdline="$3"
 	size="$(echo -n "$cmdline" | wc -c)"
-	dd if="$input" bs=3M count=1 | (
-		dd bs=4112 count=1
-		echo -n "$cmdline"
-		dd if=/dev/zero bs="$((512 - $size))" count=1
-		dd bs=512 count=1 of=/dev/null
-		cat
-	) > "$output"
+	dd if="$input" bs=3M count=1 > "$output"
+	/sbin/patch-cmdline "$output" "$cmdline"
 }
 
 fstype="$(mount | grep ' / ' | awk '{print $5}')"

target/linux/rb532-2.6/image/Makefile

@@ -20,17 +20,16 @@ LOADER_MAKEOPTS= \
 		RAMSIZE=$(RAMSIZE) \
 		IMAGE_COPY=$(IMAGE_COPY)
 
+define Build/Compile
+	$(CC) -o $(STAGING_DIR)/bin/patch-cmdline $(PLATFORM_DIR)/src/patch-cmdline.c
+endef
+
 define Build/Clean
 	$(MAKE) -C ../../generic-2.6/image/lzma-loader $(LOADER_MAKEOPTS) clean
 endef
 
-CMDLINE_SIZE=512
-CMDLINE_OFFSET=4112
-
 define Image/Prepare
-	echo 'root=/dev/cfa2 ' | \
-		dd bs=$(CMDLINE_SIZE) count=1 conv=sync | \
-		dd of=$(LINUX_DIR)/vmlinux bs=$(CMDLINE_OFFSET) conv=notrunc seek=1
+	$(STAGING_DIR)/bin/patch-cmdline $(LINUX_DIR)/vmlinux 'root=/dev/cfa2 '
 	$(KERNEL_CROSS)objcopy -O binary -R .reginfo -R .note -R .comment -R .mdebug -S $(LINUX_DIR)/vmlinux $(LINUX_KERNEL)
 endef
 
@@ -56,9 +55,7 @@ root=/dev/cfa2 rootfstype=ext2
 endef
 
 define Image/Build
-	echo '$(strip $(call Image/cmdline/$(1))) ' | \
-		dd bs=$(CMDLINE_SIZE) count=1 conv=sync | \
-		dd of=$(LINUX_DIR)/vmlinux bs=$(CMDLINE_OFFSET) conv=notrunc seek=1
+	$(STAGING_DIR)/bin/patch-cmdline $(LINUX_DIR)/vmlinux '$(strip $(call Image/cmdline/$(1))) '
 	( \
 		echo -ne OWRT | dd bs=$$$$((0x1be)) conv=sync; \
 		( \

target/linux/rb532-2.6/patches/140-cmdline_hack.patch

@@ -1,18 +1,33 @@
 diff -ur linux.old/arch/mips/kernel/head.S linux.dev/arch/mips/kernel/head.S
---- linux.old/arch/mips/kernel/head.S	2006-10-26 00:11:13.000000000 +0200
-+++ linux.dev/arch/mips/kernel/head.S	2006-10-26 02:40:10.000000000 +0200
-@@ -132,6 +132,8 @@
+--- linux.old/arch/mips/kernel/head.S	2006-12-06 17:30:27.000000000 +0100
++++ linux.dev/arch/mips/kernel/head.S	2006-12-06 18:34:43.000000000 +0100
+@@ -129,15 +129,20 @@
+ #endif
+ 	.endm
  
+-
  	j kernel_entry
  	nop
+-
 +	nop
-+EXPORT(_image_cmdline)
- 
++	
  	/*
  	 * Reserved space for exception handlers.
+ 	 * Necessary for machines which link their kernels at KSEG0.
++	 * Use as temporary storage for the kernel command line, so that it
++	 * can be updated easily without having to relink the kernel.
+ 	 */
+-	.fill	0x400
++	 
++EXPORT(_image_cmdline)
++	.ascii "CMDLINE:"
++	.fill	0x3ec
+ 
+ EXPORT(stext)					# used for profiling
+ EXPORT(_stext)
 diff -ur linux.old/arch/mips/rb500/prom.c linux.dev/arch/mips/rb500/prom.c
---- linux.old/arch/mips/rb500/prom.c	2006-10-26 00:11:14.000000000 +0200
-+++ linux.dev/arch/mips/rb500/prom.c	2006-10-26 02:40:46.000000000 +0200
+--- linux.old/arch/mips/rb500/prom.c	2006-12-06 17:30:27.000000000 +0100
++++ linux.dev/arch/mips/rb500/prom.c	2006-12-06 17:41:40.000000000 +0100
 @@ -128,6 +128,7 @@
  	/* FIXME: STUB */
  }
@@ -26,7 +41,7 @@ diff -ur linux.old/arch/mips/rb500/prom.c linux.dev/arch/mips/rb500/prom.c
  		cp+=strlen(prom_argv[i]);
  	}
 +	*(cp++) = ' ';
-+	strcpy(cp,&_image_cmdline);
++	strcpy(cp,(&_image_cmdline + 8));
 +	cp += strlen(&_image_cmdline);
  	
  	i=strlen(arcs_cmdline);

target/linux/rb532-2.6/src/patch-cmdline.c

@@ -0,0 +1,80 @@
+/*
+ * patch-cmdline.c - patch the kernel command line on rb532
+ *
+ * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
+ *
+ * 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.
+ *
+ * $Id:$
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <string.h>
+
+#define SEARCH_SPACE	(16 * 1024)
+#define CMDLINE_MAX		512
+
+int main(int argc, char **argv)
+{
+	int fd, found = 0, len, ret = -1;
+	char *ptr, *p;
+
+	if (argc != 3) {
+		fprintf(stderr, "Usage: %s <file> <cmdline>\n", argv[0]);
+		goto err1;
+	}
+	len = strlen(argv[2]);
+	if (len + 9 > CMDLINE_MAX) {
+		fprintf(stderr, "Command line string too long\n");
+		goto err1;
+	}
+	
+	if (((fd = open(argv[1], O_RDWR)) < 0) ||
+		(ptr = (char *) mmap(0, SEARCH_SPACE + CMDLINE_MAX, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == (void *) (-1)) {
+		fprintf(stderr, "Could not open kernel image");
+		goto err2;
+	}
+	
+	for (p = ptr; p < (ptr + SEARCH_SPACE); p += 4) {
+		if (memcmp(p, "CMDLINE:", 8) == 0) {
+			found = 1;
+			p += 8;
+			break;
+		}
+	}
+	if (!found) {
+		fprintf(stderr, "Command line marker not found!\n");
+		goto err3;
+	}
+
+	memset(p, 0, CMDLINE_MAX - 8);
+	strcpy(p, argv[2]);
+	msync(p, CMDLINE_MAX, MS_SYNC|MS_INVALIDATE);
+	ret = 0;
+
+err3:
+	munmap((void *) ptr, len);
+err2:
+	if (fd > 0)
+		close(fd);
+err1:
+	return ret;
+}