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mwgapHacking


This page contains information about the MWGAP AP from Minitar. This device was developed by Minitar as a replacement for the MNWAPB and resulted form a consultative process Minitar performed with users on their forums.

OpenWRT port

The goal is to port OpenWrt to this device. I'll document the process on this page and include links to any files that are created along the way. At some stage I'll build a master patch and set things up to pull in the appropriate bits as needed.

The steps are:

Select correct build options

The target device does not have a configuration in the build environment. We need to add one and select the correct target and target options befre we can build either the toolchain or the firmware itself.
 config LINUX_2_4_RTL8186
   bool "Realtek RTL8186 2.4"
   select LINUX_2_4
   depends BROKEN
   select mips
   select BIG_ENDIAN
   select USES_JFFS2
   help
     Build firmware for Realtek RTL8186 based boards
     ( eg Minitar MWGAP )


make menuconfig, 
select Advanced configuration options for developers, 
select Toolchain options, 
select gcc version 3.4.6-nonmips
back up to advanced options,
select show broken platforms
back to top level,
select the target system you added ( Realtek RTL8186 2.4 )
save your config


Patent free toolchain

This step looks surprisingly simple. I was going to apply the patches we used for the Minitar MNWAPB development from External linkhere, but after looking into the toolchain build there is already a option to build gcc 3.4.6 with a patent-free patch applied. The patch is different ( not sure of the origin ) but addresses the same instructions that the Lexra core does not support.

Getting it to build needed a couple of hacks:
  1. the download of gcc will fail so cd dl and copy gcc-3.4.6.tar.bz2 to gcc-3.4.6-nonmips.tar.bz2 ( a hard link may also be OK )
  2. When the tar is unpacked it will by default unpack into gcc-3.4.6 and the patches will fail to apply. In the trunk/toolchain/gcc/Makefile find the place where the compiler is unpacked ( line 115ish )and add this line:
 mv $(PKG_BUILD_DIR)/../gcc-3.4.6/* $(PKG_BUILD_DIR)


Building the kernel

Building against the 2.4.32 kernel needs an updated .config and a number of patches.

The Minitar firmware builds a kernel with an embedded ramdisk. This is a problem in some ways and good in others. It's a problem in that you can't change the rootfs without having to rebuild the kernel but good in that once the kernel loads it has also loaded the rootfs into RAM. This was great for testing builds a you could tftp an image to the device and then jump to it to run it - no need to touch the flash at all. This allowed you to borrow a device for a short while to test on it.

Minitar firmware


Bootloader


Version 2 (current) modified Tue, 03 Jul 2007 23:12:23 +1000 by dna0xff
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