[OpenWrt-Devel] Netgear DM200 Boot Issue/Patch Availability?

[Alberto Bursi]

It's not an Arduino, it's a USB dongle to communicate with Arduino

(and any other embedded device's) TTL serial pins.

Search for "arduino USB-TTL dongle" on ebay or amazon to find this tool.

-Alberto

On 02/06/19 17:39, Chris wrote:
> Hi Alberto,
>
> Thanks for explaining the situation to me. I'll get hold of an Arduino 
> and give this a shot.
>
> All the best,
> Chris
>
> On Tue, May 28, 2019 at 4:52 PM Alberto Bursi 
> <bobafetthotmail at gmail.com <mailto:bobafetthotmail at gmail.com>> wrote:
>
>
>     Last attempt I saw was here
>     https://github.com/openwrt/openwrt/pull/1770
>
>     but it was rejected.
>
>
>     I have some experience with the bootloader used in this device, I can
>
>     provide more complete instructions to do the uboot fix though.
>
>     TTL/serial access seems to be easy (there is a header as you see
>     in the photo),
>
>     and you need an inexpensive "arduino USB-TTL dongle" to connect to
>     this device.
>
>     Connect the pins as defined in the wiki, open up your serial
>
>     communication program (Putty usually)
>
>     and set it for 115200 serial speed, others default.
>
>     Then boot the device, press a key to stop boot when you see
>
>     "Hit any key to stop autoboot: 2 1 0"
>
>     It should stop and accept console commands.
>
>     then copy-paste this line
>
>     setenv sleep 1;nmrp;sf probe 0:3;sf read $loadaddr 0x30000
>     0x400000;bootm $loadaddr
>
>     This will alter the bootloader configuration that is causing the
>     issue. Now it will boot kernels up to 4MB big
>
>     Will still be able to boot stock firmware, we are just increasing
>     a size limit.
>
>     and then save the change by writing
>
>     saveenv
>
>     and then you can reboot the device by pulling the plug or writing
>
>     reset
>
>     Now you can install OpenWrt as normal.
>
>     -Alberto
>
>
>     On 28/05/19 14:00, Chris wrote:
>>     Hi folks,
>>
>>     I was wondering if a patch enabling this device was ever released?
>>
>>     http://lists.infradead.org/pipermail/openwrt-devel/2019-January/015556.html
>>
>>     The wiki suggests one can only install/boot into OpenWRT by
>>     wiring up a JTAG/serial interface and manually intervene... Which
>>     is far beyond my comfort zone.
>>
>>     Am very eagar to make use of this equipment, so any news would be
>>     really appreciated.
>>
>>     All the best,
>>     Chris
>>
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