1 edit | reply to markuswarren
Re: GNet BB0060B ADSL Modem/Router issue Hi MarkusWarren,
Lets not forget this is an Atmel Emergency Kit for
the Huawei MT800 Series, that it is written in old
Chineese, that i only bable in Mandarin and i must
confess that mine is so rusted, euh... i couldn't
resist such a nice opportunity!... MouHa! MouHa!
As shown previously in my article, a few pins meet
my expectations but others remain to receive close
attention so the reader's discretion is advised...
Here it goes. 1st of all, ensure that your device
is built around the appropriate FLASH chip: quite
probably of the 'AT45DB161' type but 'LoadFi' also
supports the 'AT45DB081' or the 'AT45DB321' - this
tool is specific... Now, remember that i couldn't
fully confirm the 6 pins header layout when i made
my contribution to the Corz.Org site: pins U8-13/
U8-14 clearly connect to JP1-1/JP1-2 respectively,
JP1-6 has a solid path to the ground plane but the
rest isn't visible unless one desolders this chip.
According to the Chineese illustrated guide, JP1-3
would be tied to the +3.3 Volts power supply while
U8-11/U8-12 go to JP1-4/JP1-5 respectively. JP1-6
and U8-7 seem to be at Ground (0 Volts) potential,
a statement which pictures from my article support
strongly as well. If this information is accurate
and applies to the GNet BB0060B unit then it would
be safe to move on and proceed with the PC's side:
 DB-25 Male (parallel) Connector + 100 Ohms resistor
DB25-4 (Cyan) <---> JP1-3
DB25-5 (Blue) <---> JP1-1
DB25-6 (Yellow) <-> JP1-5
DB25-7 (Black) <--> JP1-4
DB25-11 (Red) <----> ¼ Watt 100 Ω resistor <-> JP1-2
DB25-18 (Silver) <-> JP1-6
 Huawei MT8xx Maintenance Connector
Once it's done copy 'teimage.bin' and 'loadfi.exe'
together in the same directory and most preferably
close to the root on a "Real DOS" FAT-16 or FAT-32
partition, then prepare a Windows 98 Boot Disk and
power off both the MoDem/Router and PC. The cable
can be used to link the PC's parallel port and the
GNet's Maintenance Connector, at that stage you're
ready to boot using DOS v7.10 (Win98) and to start
the DSL device. Run the 'LoadFi' utility and type
"1" to restore the FirmWare using 'teimage.bin'...
If everythings goes nicely you won't get a message
saying "Cable1: No Connection"... Don't forget to
power off before you remove the maintenance cable.
Well, this is what the rescue kit looks like but i
wonder if that's actually sound in a real world...
Let's try to acquire an overall view of this setup
by looking at the standard DB-25 parallel port and
our FLASH chip, i'll show the links in the middle:
DB25-4 (Data 2) <------------------> JP1-3 <-> +3.3 Volts
DB25-5 (Data 3) <------------------> JP1-1 <-> U8-13 (SI)
DB25-6 (Data 4) <------------------> JP1-5 <-> U8-12 (SCk)
DB25-7 (Data 5) <------------------> JP1-4 <-> U8-11 (*CS)
DB25-11 (Busy) <-> 100 Ω resistor <-> JP1-2 <-> U8-14 (SO)
DB25-18 (Ground) <------------------> JP1-6 <-> U8-7 (Gnd)
* Marked as "Active Low".
That's where this investigation came to a halt: i
was trying to validate the connections but i get a
strange feeling that tells me pins JP1-2 and JP1-3
may need to have their positions reversed. I read
no positive confirmation stating that the cable is
actually working with a GNet BB0060B unit, this is
why the user is advised to proceed with caution...
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