USB serial console

Carlos Camargo cicamargoba at gmail.com
Sat Sep 12 12:17:53 EDT 2009


Thanks a lot Ignacio

Saludos


Carlos



On Fri, Sep 11, 2009 at 4:27 AM, Ignacio García Pérez <iggarpe at gmail.com>wrote:

> Earlier releases of Dingux had a g_serial console too, but it had some
> inconveniences, for example file transfer is possible but a pain in the ass.
>
> So I moved to ethernet gadget. The interface is set as 10.1.0.2/30 and a
> DHCP server is configured to provide only one lease which is always
> 10.1.0.1/30. Inetd is also launched and telnet/ftp services are provided
> through it. When the system boots, the PC soon sees a new ethernet card
> which is autoconfigured vía the DHCP server. Then you can access the console
> vía telnet and transfer files vía FTP.
>
> If you consider this approach, some remarks about the 2.6.24.3 Ingenic
> kernel:
>
> 1- You must modify the code to enable CDC mode in your code
> (drivers/usb/gadget/ether.c).
> 2- The code needs an small fix so Windows will recognize the ethernet card
> (see file above in the dingux kernel source).
> 3- Something is badly broken either in the Ingenic USB device or DMA code.
> The ethernet gadget only works reliably if you disable DMA (put
> jz4740_udc.use_dma=0 in the kernel command line). This halves throughput but
> works.
>
> I believe the DMA problem is not specific to the ethernet gadget code. I
> mean it should be present also when using the g_serial gadget. However, only
> shows up when using the full bandwidth, which rarely happens on a serial
> console.
>
> Regards.
>
> 2009/9/10 Carlos Camargo <cicamargoba at gmail.com>
>
>> HI
>>
>> I'm working with my custom JZ4725 board, I'm using linux 2.6.24.3 with
>> g_serial driver. I can run one console on /dev/ttygserial, so, we don't need
>> any USB/serial cable right now.
>>
>> I can't find the application getty on openwrt, I've already used mgetty,
>> but it doesn't work. I try with an openembedded distro, this distro provide
>> getty so, I can use it to enable the USB serial console.
>>
>> Is possible add getty to openwrt?
>>
>>
>> Best Regards
>>
>> Carlos
>>
>>
>> --
>> Carlos Iván Camargo Bareño
>> Profesor Asistente
>> Departamento de Ingeniería Eléctrica y Electrónica
>> Universidad Nacional de Colombia
>> cicamargoba at unal.edu.co
>>
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>
>
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-- 
Carlos Iván Camargo Bareño
Profesor Asistente
Departamento de Ingeniería Eléctrica y Electrónica
Universidad Nacional de Colombia
cicamargoba at unal.edu.co
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