Please make clear of the file data format of flash dumping output

[wuwbobo2021]

It's just trying to read back the fuse data from an XC95144XL chip.

The --file-size parameter is probably unused in Xilinx::dumpFlash for XC95_FAMILY, but the command-line utility forces me to set it, so I entered some random value, and the actual output size is always 12,960 B.

openFPGALoader --cable jlink_base --freq 1000 --fpga-part xc95144xl --dump-flash dump.jed -v --file-size 1048576

Output:

empty
1366:0101 (bus 1, device 31)
b9ff7bbf
 0 EMU_CAP_RESERVED
 1 EMU_CAP_GET_HW_VERSION
 2 EMU_CAP_WRITE_DCC
 3 EMU_CAP_ADAPTIVE_CLOCKING
 4 EMU_CAP_READ_CONFIG
 5 EMU_CAP_WRITE_CONFIG
 7 EMU_CAP_WRITE_MEM
 8 EMU_CAP_READ_MEM
 9 EMU_CAP_SPEED_INFO
11 EMU_CAP_GET_MAX_BLOCK_SIZE
12 EMU_CAP_GET_HW_INFO
13 EMU_CAP_SET_KS_POWER
14 EMU_CAP_RESET_STOP_TIMED
16 EMU_CAP_MEASURE_RTCK_REACT
17 EMU_CAP_SELECT_IF
18 EMU_CAP_RW_MEM_ARM79
19 EMU_CAP_GET_COUNTERS
20 EMU_CAP_READ_DCC
21 EMU_CAP_GET_CPU_CAPS
22 EMU_CAP_EXEC_CPU_CMD
23 EMU_CAP_SWO
24 EMU_CAP_WRITE_DCC_EX
27 EMU_CAP_REGISTER
28 EMU_CAP_INDICATORS
29 EMU_CAP_TEST_NET_SPEED
31 Reserved
device type: J-Link major: 9 minor: 70 revision: 0
found 1 devices
index 0:
        idcode 0x9608093
        manufacturer xilinx
        family xc9500xl
        model  xc95144xl
        irlength 8
File type : jed
Read Flash: [==================================================] 100.00%
Done                                                                                                
Open dump file DONE
Read flash DONE

The output file is really not a .jed (JESD3-C) format file, but it equals the dump.bin file read by openFPGALoader when it prompted File type : bin. It's just kidding. Checking the source code, I realized that it is impossible to get a real .jed format output. It is just some raw data, probably similar to some data parsed by JedParser, but I'm not sure.

Also, I couldn't get some stable dump output even with an extremely slow JTAG clock rate. There's a TODO: verify mark in xilinx.cpp, does this mean that function flow_read() used in both verification and dumping process is currently problematic?