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WARNING: This document may contain errors which may result in damage to your router. USE AT YOUR OWN RISK.
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I recently bought a cheap D-Link DIR300 router from Ebay with stock firmware, and decided to install the Gargoyle firmware. However, the installation guide provided here did not work for me. The problem was that I was indeed able to install the new bootloader and DD-WRT, but after restarting the router in order to install the Gargoyle firmware then the bootloader loaded but DD-WRT did not, thus I was unable to use the Fon Flash. Then I found an installation guide for OpenWrt (http://oldwiki.openwrt.org/OpenWrtDocs(2f)Hardware(2f)D(2d)Link(2f)DIR(2d)300.html)and altered it a bit for Gargoyle.

Hire is my installation guide:

Assuming you want to install Gargoyle 1.0.14, then you need to copy the following files to your local TFTP server (for windows use tftp32 http://tftpd32.jounin.net/):

    * ap61.ram – Downloaded from the DD-WRT site.
    * ap61.rom – Downloaded from the DD-WRT site.
    * gargoyle_1.0.14-atheros-root.squashfs
    * gargoyle_1.0.14-atheros-vmlinux.lzma


Start the TFTP server and replace the bootloader as described here: http://www.dd-wrt.com/wiki/index.php/DIR300.

You do not need to install DD-WRT just the DD-WRT bootloader!

Chang your local ip to 192.168.1.2/255.255.255.0 restart the router and if you are able to telnet on port 9000 and ip 192.168.1.1 (use Putty as a Telnet client for Windows) then do the following:

<shell>
DD-WRT> fis init
About to initialize [format] FLASH image system - continue (y/n)? y
*** Initialize FLASH Image System
... Erase from 0xbffe0000-0xbfff0000: .
... Program from 0x80ff0000-0x81000000 at 0xbffe0000: .
DD-WRT> ip_address -h 192.168.1.2
DD-WRT> load -r -b %{FREEMEMLO} gargoyle_1.0.14-atheros-vmlinux.lzma
Using default protocol (TFTP)
Raw file loaded 0x80040800-0x801007ff, assumed entry at 0x80040800
DD-WRT> fis create -e 0x80041000 -r 0x80041000 vmlinux.bin.l7
... Erase from 0xbfc30000-0xbfcf0000: ............
... Program from 0x80040800-0x80100800 at 0xbfc30000: ............
... Erase from 0xbffe0000-0xbfff0000: .
... Program from 0x80ff0000-0x81000000 at 0xbffe0000: .
DD-WRT> load -r -b %{FREEMEMLO} gargoyle_1.0.14-atheros-root.squashfs
Using default protocol (TFTP)
Raw file loaded 0x80040800-0x802207ff, assumed entry at 0x80040800
DD-WRT> fis create rootfs
... Erase from 0xbfcf0000-0xbffb0000: ...............................................
... Program from 0x80040800-0x80220800 at 0xbfcf0000: ..............................
... Erase from 0xbffe0000-0xbfff0000: .
... Program from 0x80ff0000-0x81000000 at 0xbffe0000: .
DD-WRT> fconfig
Run script at boot: true
Boot script:
Enter script, terminate with empty line
>> fis load -l vmlinux.bin.l7
>> exec
>>
Boot script timeout (1000ms resolution): 4
Use BOOTP for network configuration: true
Gateway IP address: 192.168.1.1
Console baud rate: 9600
GDB connection port: 9000
Force console for special debug messages: false
Network debug at boot time: false
Update RedBoot non-volatile configuration - continue (y/n)? y
... Erase from 0xbffe0000-0xbfff0000: .
... Program from 0x80ff0000-0x81000000 at 0xbffe0000: .
DD-WRT> reset

</shell>

Now reset your IP configuration and you should be able to log in to Gargoyle via HTTP or SSH.

You can install other versions of Gargoyle via the web insterface.