Hi M~,
1) I havn't test it's nIBOOT pin, I have dump the flash with gtm900-b with your
fc tool
https://app.2sim.cn/gsm/gtm_full.bin
2) I modify this for 900/1800 switching, using gta02 OsmocomBB
#define ASM_VC1 TSPACT(1)
#define ASM_VC2 TSPACT(2)
https://app.2sim.cn/gsm/rffe_gta0x_triband.c
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
------------------ ???????? ------------------
??????: "Mychaela Falconia"<mychaela.falco...@gmail.com>;
????????: 2019??5??29??(??????) ????4:28
??????: "songbosi"<79543...@qq.com>;
????: "community"<community@freecalypso.org>;
????: Re: Perfect module (D751749ZHH)
Hi again Songbosi,
Thanks for the documentation - that GTM900-B module does look
interesting. Given that you've got OsmocomBB running on it, you must
have already done a fair bit of reverse engineering on this module in
order to get that far, so I hope you don't mind if I ask you to share
some of your technical findings. Let us start with a few basics:
1) Does this module have the Calypso boot ROM enabled via nIBOOT pin
strapping? In other words, is it possible to gain code download
access via tools like fc-loadtool or osmocon, or is JTAG the only way?
2) How are various GPIO and RF control signals wired? Which TSPEN
signal goes to the Rita transceiver (TSPEN2 like on most Calypso
designs, or TSPEN1 like on the Pirelli DP-L10, or other?) and which
TSPACT signal controls what?
You also wrote on the OsmocomBB mailing list:
> I have about 500 pcs left, I could sell them with $15/pcs
Your price is very reasonable and I may be interested in a few to play
with, but do you have any kind of breakout board for easy
experimentation with these modules?
M~
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