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Felix Fietkau 076d58d344 firmware-utils: mkfwimage: fix firmware_max_length for XM layout
The new u-boot version bundled with the 5.6.x firmwares from Ubiquiti gets
confused by the smaller rootfs partition size; this can lead to various
issues:

1. We've gotten reports that flashing from the 5.6.x stock firmware to
   OpenWrt will brick devices; I wasn't able to reproduce this myself
2. Flashing from 5.5.x stock firmware to OpenWrt and back to stock (via
   TFTP recovery), following by an update to 5.6.x via web interface can
   yield a bricked device with the following properties:
   - It can't be booted without entering commands over a serial console, as
     u-boot supplies the wrong MTD layout
   - The web interface won't accept any image with the original flash
     layout, so stock firmware upgrades are impossible
   - As the TFTP recovery doesn't update u-boot, returning to the old
     u-boot from firmware 5.5.x is impossible

To recover from 2., creating an OpenWrt image which doesn't set u-boot as
read-only and flashing a backup of the old u-boot from there is the only
way known to me. (Fixing the mtdparts variable in u-boot-env from OpenWrt
might also work; settings this from u-boot over serial didn't have
any permanent effect.)

Fix all of this by setting the correct flash layout also used by the stock
firmware. Flashing has been tested from both firmware 5.5.x and 5.6.x. The
fixed layout also matches the mtdparts defined by OpenWrt.

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>

SVN-Revision: 48829
2016-02-29 20:11:33 +00:00
config build: don't add -fno-plt for ARC 2016-02-07 13:29:16 +00:00
docs build: Prevent more gzip timestamps 2015-07-14 09:57:45 +00:00
include include/target.mk: fix profile defaults 2016-02-26 20:47:10 +00:00
package mt76: update to the latest version, adds a number of stability fixes 2016-02-28 21:06:08 +00:00
scripts scripts/download.pl: fix sha256 hash command (#21931) 2016-02-27 16:20:06 +00:00
target ar71xx, firmware-utils: split ubdev01 flash layout from XM 2016-02-29 20:11:30 +00:00
toolchain gcc: update gcc 5 to version 5.3.0 2016-02-29 20:09:45 +00:00
tools firmware-utils: mkfwimage: fix firmware_max_length for XM layout 2016-02-29 20:11:33 +00:00
.gitattributes add .gitattributes to prevent the git autocrlf option from messing with CRLF/LF in files 2012-05-08 13:30:49 +00:00
.gitignore build: add integration for managing opkg package feed keys 2015-04-06 19:39:51 +00:00
BSDmakefile add missing copyright header 2007-02-26 01:05:09 +00:00
Config.in scripts/config: sync with linux upstream 2015-01-08 14:33:53 +00:00
feeds.conf.default feeds.conf.default: add new targets feed 2015-03-19 11:58:35 +00:00
LICENSE finally move buildroot-ng to trunk 2016-03-20 17:29:15 +01:00
Makefile Makefile: set timezone to UTC 2016-01-28 22:42:18 +00:00
README Add 'subversion' build dependency to README 2014-08-31 12:06:32 +00:00
rules.mk build: disable the use of -iremap for UML (#21851) 2016-02-13 22:23:32 +00:00

This is the buildsystem for the OpenWrt Linux distribution.

Please use "make menuconfig" to configure your appreciated
configuration for the toolchain and firmware.

You need to have installed gcc, binutils, bzip2, flex, python, perl, make,
find, grep, diff, unzip, gawk, getopt, subversion, libz-dev and libc headers.

Run "./scripts/feeds update -a" to get all the latest package definitions
defined in feeds.conf / feeds.conf.default respectively
and "./scripts/feeds install -a" to install symlinks of all of them into
package/feeds/.

Use "make menuconfig" to configure your image.

Simply running "make" will build your firmware.
It will download all sources, build the cross-compile toolchain, 
the kernel and all choosen applications.

You can use "scripts/flashing/flash.sh" for remotely updating your embedded
system via tftp.

The OpenWrt system is documented in docs/. You will need a LaTeX distribution
and the tex4ht package to build the documentation. Type "make -C docs/" to build it.

To build your own firmware you need to have access to a Linux, BSD or MacOSX system
(case-sensitive filesystem required). Cygwin will not be supported because of
the lack of case sensitiveness in the file system.


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