Re： Perfect module (D751749ZHH)

[songbosi]

Hi Mychaela,




>The fact that you were able to get in with fc-loadtool indicates that
>the boot ROM must be enabled.  Can you please explicitly confirm that
>you can run tools like fc-loadtool or osmocon -m romload against the
>GTM900-B without needing to do anything via JTAG first?  The reason I
>am asking is because your very first introductory post about this
>module showed JTAG test pad locations, giving the impression that JTAG
>is required in order to work with this module.


I confirm that you can run fc tools or osmocon without using JTAG first.
That 4 test point, have no label, I break down some modules to figure it out
That was JTAG


For testing, using an USB to UART adapter with pc, connect pin 18/19
PIN 18 <-->usb-uart RX
PIN 19 <-->usb-uart TX


running
osmocon -m romload


PIN 31(reset) (as C118's pow key, pull down to GND shortly)
the module will load the FW


>Your code indicates that on this module TSPACT1 is the low band Tx
>enable and TSPACT2 is the high band Tx enable, both active low - is
>that correct?  If so, then Huawei must have reversed these two control
>signals relative to TI's Leonardo reference design, where they go the
>other way around: TSPACT1 to enable high band Tx and TSPACT2 to enable
>low band Tx, plus TSPACT4 to control the GSM850 Rx switch which is
>only present on quadband boards.  Openmoko's design permutes these 3
>RFFE control signals in yet another way.


I checked the voltage of RF switch by changing TSPACT(1) TSPACT(2),  it should be correct.


>Aside from this little TSPACT RFFE control signal permutation, I find
>it very remarkable that this Huawei modem is so close to TI's reference
>design!  Up until now it seemed to me that Openmoko was literally the
>only Calypso-based modem manufacturer in the world who kept TI's
>reference design (both hw and fw) with absolutely minimal changes,
>while every other phone (Compal, Chi-Mei, Foxconn) and modem (BenQ M32)
>manufacturer changed both the hardware and the firmware beyond all
>recognition.  I am glad to see Huawei stand next to Openmoko in this
>regard!

>As far as Huawei's firmware design goes, looking at your flash dump,
>I was just as delighted to see a classic TIFFS file system structure
>in the same flash location as on OM's modem (looking at your pictures,
>it looks like this module uses the same Samsung flash chip as was used
>by OM), and examining that file system content with my tiffs tool (I
>can even use the same mokoffs user-friendly wrapper!), I see that it
>contains TI's classic RF calibration tables!  Getting FC Magnetite and
>Selenite firmwares to run on this modem hw is promising to be a
>breeze. :-)

> 3) I would ship this module to US with fpc connector, you can just using
> an USB to UART adapter to get it work with PC
> https://app.2sim.cn/gsm/fpc.jpg

>OK, I would like to buy 3 pieces from you - please email me off-list
>to work out payment and shipping.

M~