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

[NOVAK, P. <pe...@do...>]

Thanks, this might get useful. I have fried only 1 unit out of about 500 which
we have used in our project (CPE for wireless ISP). Please note that compared
to other RTL8181 based units, there are about 10% of the Ovislinks which have
bad radio, which transmits well, but is deaf on receiving. We regularly return
about 10% of units for that reason.

PN

On Tue, 26 Jul 2005 07:58:33 -0300, Marcelo Costa wrote
> 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  =  Ovislink JP1
>      1            =       1
>      2            =       6
>      5            =       3
>      7            =       5
>      9            =       7
>     11           =       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 support
> >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 MIPS
> >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 with
> >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, the
> >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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--
Petr Novak
pe...@do...
+420 775 36 26 73