Re: [HRI-devel] JTAG & RTL-8181

[Marcelo C. <mc...@mc...>]

Hi Petr,

Thank you for your quick reply.
The problem is that I have 80 units of the ovislink  with no bootloader
and I need to repair it.

here is what I discover :

R17 - short it to enable jtag mode (under the board)
R8 - short it  (tdo line)

JP1 pin out
1 - 3.3V
2 -  RTL8181 pin 8
3 -  RTL8181 pin 11 - TDI
4 -  RTL8181 pin 6   - TDO
5 -  RTL8181 pin 9  - TMS
6 -  GND
7 -  RTL8181 pin 64 - CLK

adapter for the JTAG box (14 pins)

JTAG pin  =3D  Ovislink JP1
     1            =3D       1
     2            =3D       6
     5            =3D       3
     7            =3D       5
     9            =3D       7
    11           =3D       4


Regards,
Marcelo Costa


Em 25/7/2005, "NOVAK, Petr" <pe...@do...> escreveu:

>Hi Marcelo,
>
>I was using this device in several projects, but without the JTAG connection=
,
>only using the console. I think the EJTAG description is part of the MIPS
>original documentation and it might be possible that the chip does not suppo=
rt
>a regular boundary scan, but only the MIPS proprietary EJTAG functionality.
>However, things like Flash programming can be achieved with EJTAG as well,
>actually easier than with a boundary scan. Besides, as there is no reals MIP=
S
>core in the RTL8181 but the Lexra MIPS clone, so the EJTAG the manuals might
>not reflect the real implementation on the RTL8181.
>
>However, the RTl8181 based devices are more and more rare and most
>manufacturers (Edimax, JAHT, ...) have replaced the RTL8181 based designs wi=
th
>Infineon / ADMTek ADM5120 based designs. For more information, please see
>http://www.linux-mips.org/wiki/ADMtek . As this chip has a real MIPS core, t=
he
>EJTAG manual will be 100% reliable here.
>
>On Mon, 25 Jul 2005 18:44:28 -0300, Marcelo Costa wrote
>> Hi,
>>
>> I am playing with jtag on an  Ovislink Air Live wireless access
>> point. everything if fine, but the BSDL file of the RTL8181. Does
>> anyone has it?
>>
>> I will send all the informations about jtag and ovislink after I
>> make it work.
>>
>> Regards,
>> Marcelo Costa
>>
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>
>--
>Petr Novak
>pe...@do...
>+420 775 36 26 73
>
>
>
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