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Data Verification failed during loading code to TM4C1294XL



I use IDE IAR 7.10
Often there is a problem loading a program TM4C129.
That portion of the log

I use IDE IAR 7.10
Often there is a problem loading a program TM4C129.
That portion of the debug log IAR:

May 05, 2014 15:23:45: Loaded macro file: C:\Program Files\IAR Systems\Embedded Workbench 7.0\arm\config\flashloader\TexasInstruments\FlashTC4.mac
Mon May 05, 2014 15:23:45: JTAG Speed is set to: 500 kHz
Mon May 05, 2014 15:23:45: JTAG IDCODE      = 0x0BA00477
Mon May 05, 2014 15:23:45: AHB-AP ID        = 0x00000000
Mon May 05, 2014 15:23:45: AHB-AP ROM       = 0x00000000
Mon May 05, 2014 15:23:45: ROM Component ID = 0x00000000
Mon May 05, 2014 15:23:45: Device ID        = 0x00000000 (Unknown)
Mon May 05, 2014 15:23:45: Software reset was performed
Mon May 05, 2014 15:23:45: Initial reset was performed
Mon May 05, 2014 15:23:45: Turning off watchdog timers
Mon May 05, 2014 15:23:45: 1024 bytes downloaded and verified (7.14 Kbytes/sec)
Mon May 05, 2014 15:23:45: Loaded debugee: C:\Program Files\IAR Systems\Embedded Workbench 7.0\arm\config\flashloader\TexasInstruments\FlashTC4_256KB.out
Mon May 05, 2014 15:23:45: Target reset
Mon May 05, 2014 15:23:52: Unloaded macro file: C:\Program Files\IAR Systems\Embedded Workbench 7.0\arm\config\flashloader\TexasInstruments\FlashTC4.mac
Mon May 05, 2014 15:23:52: Downloaded D:\Work\4K-WALL\ewarm\Exe\4k_web.out to flash memory.
Mon May 05, 2014 15:23:52: Software reset was performed
Mon May 05, 2014 15:23:57: 116292 bytes downloaded into FLASH and verified (9.39 Kbytes/sec)
Mon May 05, 2014 15:23:57: Warning:  Verify error at address 0x00015D4C, target byte: 0xFF, byte in file: 0x30
Mon May 05, 2014 15:23:57: Warning:  Verify error at address 0x00015D4D, target byte: 0xFF, byte in file: 0xCA
Mon May 05, 2014 15:23:57: Warning:  Verify error at address 0x00015D4E, target byte: 0xFF, byte in file: 0x49

.....

Mon May 05, 2014 15:23:57: Warning:  Verify error at address 0x00017D17, target byte: 0x00, byte in file: 0xBD
Mon May 05, 2014 15:24:03: Warning: There were warnings during download, see Log Window
Mon May 05, 2014 15:24:03: Loaded debugee: D:\Work\4K-WALL\ewarm\Exe\4k_web.out
Mon May 05, 2014 15:24:03: Software reset was performed
Mon May 05, 2014 15:24:03: Target reset
Mon May 05, 2014 15:24:04: There was 1 warning during the initialization of the debugging session.

Part of the map file:

  Section            Kind        Address     Size  Object
  -------            ----        -------     ----  ------
"P1":                                     0x1c444
...

  .rodata            const    0x000152a0    0x380  fs.o [1]
  .rodata            const    0x00015620    0x374  fs.o [1]
  .rodata            const    0x00015994    0x36c  fs.o [1]
  .rodata            const    0x00015d00    0x368  fs.o [1]

...

What could be the reason?