Why my C118 can't send DOWNLOAD ACK?

[xuchenyu]

~/src/osmocom-bb/src/host/osmocon$ ./osmocon -p /dev/ttyUSB0 -m c123
../../target/firmware/board/compal_e88/layer1.compalram.bin
got 1 bytes from modem, data looks like: 00  .
got 1 bytes from modem, data looks like: 00  .
got 1 bytes from modem, data looks like: 2f  /
got 1 bytes from modem, data looks like: 00  .
got 1 bytes from modem, data looks like: 1b  .
got 2 bytes from modem, data looks like: f6 02  ..
got 1 bytes from modem, data looks like: 00  .
got 1 bytes from modem, data looks like: 41  A
got 1 bytes from modem, data looks like: 01  .
got 1 bytes from modem, data looks like: 40  @
Received PROMPT1 from phone, responding with CMD
read_file(../../target/firmware/board/compal_e88/layer1.compalram.bin):
file_size=50932, hdr_len=4, dnload_len=50939
got 1 bytes from modem, data looks like: 1b  .
got 1 bytes from modem, data looks like: f6  .
got 1 bytes from modem, data looks like: 02  .
got 1 bytes from modem, data looks like: 00  .
got 1 bytes from modem, data looks like: 41  A
got 1 bytes from modem, data looks like: 02  .
got 1 bytes from modem, data looks like: 43  C
Received PROMPT2 from phone, starting download
handle_write(): 4096 bytes (4096/50939)
handle_write(): 4096 bytes (8192/50939)
handle_write(): 4096 bytes (12288/50939)
handle_write(): 4096 bytes (16384/50939)
handle_write(): 4096 bytes (20480/50939)
handle_write(): 4096 bytes (24576/50939)
handle_write(): 4096 bytes (28672/50939)
handle_write(): 4096 bytes (32768/50939)
handle_write(): 4096 bytes (36864/50939)
handle_write(): 4096 bytes (40960/50939)
handle_write(): 4096 bytes (45056/50939)
handle_write(): 4096 bytes (49152/50939)
handle_write(): 1787 bytes (50939/50939)
handle_write(): finished


It stopped here for very long time, I have tried with XOR and without XOR
for many times! Please help me to verify this issue! thanks very much!

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