[lantiq] Support booting the Speedport W502V using BRN-BOOT.

While the disadvantage is less available flash space, it's easy and
safe to flash without opening the device.
Going back to the original firmware is also possible.

This patch add two firmware utilities, mkbrncmdline and mkbrnboot.

mkbrncmdline patches the uncompressed kernel so the registeres a0 to
a3 are initialized and the memory size is passed in.

mkbrnboot takes the lzma compressed kernel and squashfs images and
creates a firmware image that can be flashed using the BRN-BOOT
recovery kernel, which is booted by holding both buttons when
powering up the device and will listen on http://192.168.2.1.

The firmware file from bin/lantiq/ to use is
openwrt-lantiq-danube-ARV4525PW-BRNDTW502-brnImage

The BRN-BOOT recovery kernel does size-check the image, so if it's
too big to fit into flash it will complain accordingly.

A second patch is needed to make the wired network interface work
since there is no u-boot to pre-initialise it.

Signed-off-by: Tobias Diedrich <ranma+openwrt@tdiedrich.de>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@30532 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 93 insertions, 0 deletions

diff --git a/target/linux/lantiq/patches/206-owrt-brnboot.patch b/target/linux/lantiq/patches/206-owrt-brnboot.patch
new file mode 100644
index 0000000000..c21d76d1f8
--- /dev/null
+++ b/target/linux/lantiq/patches/206-owrt-brnboot.patch
@@ -0,0 +1,93 @@
+Index: linux-3.1.9/drivers/mtd/mtdpart.c
+===================================================================
+--- linux-3.1.9.orig/drivers/mtd/mtdpart.c	2012-01-29 22:55:30.295904157 +0100
++++ linux-3.1.9/drivers/mtd/mtdpart.c	2012-01-29 22:55:30.395904294 +0100
+@@ -899,6 +899,38 @@
+ 	return le32_to_cpu(temp) == SQUASHFS_MAGIC;
+ }
+ 
++static unsigned long find_brnimage_size(struct mtd_info *mtd,
++				      unsigned long offset)
++{
++	unsigned long buf[4];
++	// Assume at most 2MB of kernel image
++	unsigned long end = offset + (2 << 20);
++	unsigned long ptr = offset + 0x400 - 12;
++	size_t len;
++	int ret;
++
++	while (ptr < end) {
++		long size_min = ptr - 0x400 - 12 - offset;
++		long size_max = ptr + 12 - offset;
++		ret = mtd->read(mtd, ptr, 16, &len, (void *)buf);
++		if (ret || len != 16)
++			return 0;
++
++		if (le32_to_cpu(buf[0]) < size_min ||
++		    le32_to_cpu(buf[0]) > size_max) {
++			ptr += 0x400;
++			continue;
++		}
++
++		if (le32_to_cpu(buf[3]) == SQUASHFS_MAGIC)
++			return ptr + 12 - offset;
++
++		ptr += 0x400;
++	}
++
++	return 0;
++}
++
+ static int split_uimage(struct mtd_info *mtd,
+ 			const struct mtd_partition *part)
+ {
+@@ -916,8 +948,11 @@
+ 
+ 	split_partitions[0].size = find_uimage_size(mtd, part->offset);
+ 	if (!split_partitions[0].size) {
+-		printk(KERN_NOTICE "no uImage found in linux partition\n");
+-		return -1;
++		split_partitions[0].size = find_brnimage_size(mtd, part->offset);
++		if (!split_partitions[0].size) {
++			printk(KERN_NOTICE "no uImage or brnImage found in linux partition\n");
++			return -1;
++		}
+ 	}
+ 
+ 	if (!detect_squashfs_partition(mtd,
+Index: linux-3.1.9/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h
+===================================================================
+--- linux-3.1.9.orig/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h	2012-01-29 22:55:30.195904014 +0100
++++ linux-3.1.9/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h	2012-01-29 22:55:30.395904294 +0100
+@@ -149,6 +149,7 @@
+ 
+ extern __iomem void *ltq_ebu_membase;
+ extern __iomem void *ltq_cgu_membase;
++extern long ltq_brn_boot;
+ 
+ /* request a non-gpio and set the PIO config */
+ extern int  ltq_gpio_request(unsigned int pin, unsigned int alt0,
+Index: linux-3.1.9/arch/mips/lantiq/setup.c
+===================================================================
+--- linux-3.1.9.orig/arch/mips/lantiq/setup.c	2012-01-29 22:55:30.095903875 +0100
++++ linux-3.1.9/arch/mips/lantiq/setup.c	2012-01-29 22:59:28.686237119 +0100
+@@ -20,6 +20,8 @@
+ 
+ /* assume 16M as default incase uboot fails to pass proper ramsize */
+ unsigned long physical_memsize = 16L;
++/* set to 1 if the bootloader is BRN-BOOT instead of u-boot */
++unsigned long ltq_brn_boot = 0;
+ 
+ void __init plat_mem_setup(void)
+ {
+@@ -39,6 +41,10 @@
+ 			if (strict_strtoul(e, 0, &physical_memsize))
+ 				pr_warn("bad memsize specified\n");
+ 		}
++		if (!strncmp(e, "BRN-BOOT", 8)){
++			pr_info("Found BRN-BOOT instead of u-boot\n");
++			ltq_brn_boot = 1;
++		}
+ 		envp++;
+ 	}
+ 	physical_memsize *= 1024 * 1024;