From 0c83ec7fc27ba431d76d8c53f3f4b84a6b333abc Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Sun, 6 May 2007 18:30:53 +0000
Subject: [PATCH] revert to the previous version of the flash map driver -
 committed the wrong one in [7092]

SVN-Revision: 7118
---
 .../files/drivers/mtd/maps/bcm947xx-flash.c   | 54 +++++++++++++++++--
 1 file changed, 49 insertions(+), 5 deletions(-)

diff --git a/target/linux/brcm-2.4/files/drivers/mtd/maps/bcm947xx-flash.c b/target/linux/brcm-2.4/files/drivers/mtd/maps/bcm947xx-flash.c
index ee02563661..3176eb0552 100644
--- a/target/linux/brcm-2.4/files/drivers/mtd/maps/bcm947xx-flash.c
+++ b/target/linux/brcm-2.4/files/drivers/mtd/maps/bcm947xx-flash.c
@@ -158,6 +158,7 @@ static struct mtd_partition bcm947xx_parts[] = {
 	{ name: "linux", offset: 0, size: 0, },
 	{ name: "rootfs", offset: 0, size: 0, },
 	{ name: "nvram", offset: 0, size: 0, },
+	{ name: "OpenWrt", offset: 0, size: 0, },
 	{ name: NULL, },
 };
 
@@ -321,8 +322,24 @@ find_root(struct mtd_info *mtd, size_t size, struct mtd_partition *part)
 	if (MTD_READ(mtd, part->offset, sizeof(buf), &len, buf) || len != sizeof(buf))
 		return 0;
 
-	/* Move the filesystem outside of the trx */
-	part->size = 0;
+	if (*((__u32 *) buf) == SQUASHFS_MAGIC) {
+		printk(KERN_INFO "%s: Filesystem type: squashfs, size=0x%x\n", mtd->name, (u32) sb->bytes_used);
+
+		/* Update the squashfs partition size based on the superblock info */
+		part->size = sb->bytes_used;
+		len = part->offset + part->size;
+		len +=  (mtd->erasesize - 1);
+		len &= ~(mtd->erasesize - 1);
+		part->size = len - part->offset;
+	} else if (*((__u16 *) buf) == JFFS2_MAGIC_BITMASK) {
+		printk(KERN_INFO "%s: Filesystem type: jffs2\n", mtd->name);
+
+		/* Move the squashfs outside of the trx */
+		part->size = 0;
+	} else {
+		printk(KERN_INFO "%s: Filesystem type: unknown\n", mtd->name);
+		return 0;
+	}
 
 	if (trx.len != part->offset + part->size - off) {
 		/* Update the trx offsets and length */
@@ -397,9 +414,36 @@ init_mtd_partitions(struct mtd_info *mtd, size_t size)
 			(2*bcm947xx_parts[3].size) - 
 			mtd->erasesize;
 	}
-	
-	find_root(mtd,size,&bcm947xx_parts[2]);
-	bcm947xx_parts[2].size = size - bcm947xx_parts[2].offset - bcm947xx_parts[3].size;
+
+	/* find and size rootfs */
+	if (find_root(mtd,size,&bcm947xx_parts[2])==0) {
+		/* entirely jffs2 */
+		bcm947xx_parts[4].name = NULL;
+		bcm947xx_parts[2].size = size - bcm947xx_parts[2].offset - 
+				bcm947xx_parts[3].size;
+	} else {
+		/* legacy setup */
+		/* calculate leftover flash, and assign it to the jffs2 partition */
+		if (cfe_size != 384 * 1024) {
+			bcm947xx_parts[4].offset = bcm947xx_parts[2].offset + 
+				bcm947xx_parts[2].size;
+			if ((bcm947xx_parts[4].offset % mtd->erasesize) > 0) {
+				bcm947xx_parts[4].offset += mtd->erasesize - 
+					(bcm947xx_parts[4].offset % mtd->erasesize);
+			}
+			bcm947xx_parts[4].size = bcm947xx_parts[3].offset - 
+				bcm947xx_parts[4].offset;
+		} else {
+			bcm947xx_parts[4].offset = bcm947xx_parts[2].offset + 
+				bcm947xx_parts[2].size;
+			if ((bcm947xx_parts[4].offset % mtd->erasesize) > 0) {
+				bcm947xx_parts[4].offset += mtd->erasesize - 
+					(bcm947xx_parts[4].offset % mtd->erasesize);
+			}
+			bcm947xx_parts[4].size = size - bcm947xx_parts[3].size - 
+				bcm947xx_parts[4].offset;
+		}
+	}
 
 	return bcm947xx_parts;
 }