JLINK能检测到CPU和FLASH,不能擦除FLASH

今天遇到个奇怪的问题,用JLINK烧写U-BOOT到NORFlash时,在j-FLASH arm 中选择connect 可以识别到CPU和Flash,当选择erase sectors时,就提示擦除失败,不知是什么问题

这个是Jlink的信息
Application log started
- J-Flash ARM V4.08i (J-Flash compiled Jul 31 2009 18:25:26)
- JLinkARM.dll V4.08i (DLL compiled Jul 31 2009 18:23:57)
Reading flash device list [C:\Program Files\SEGGER\JLinkARM_V408i\ETC\JFlash\Flash.csv] ...
- List of flash devices read successfully (586 Devices)
Reading MCU device list [C:\Program Files\SEGGER\JLinkARM_V408i\ETC\JFlash\MCU.csv] ...
- List of MCU devices read successfully (353 Devices)
Opening project file [F:\linux_share\system\Jlink\TQ2440.jflash] ...
- Project opened successfully
Opening data file [F:\linux_share\system\u-boot_304MHz.bin] ...
- Data file opened successfully (231424 bytes, 1 range, CRC = 0x27D41965)
Connecting ...
- Connecting via USB to J-Link device 0
- J-Link firmware: V1.20 (J-Link ARM V8 compiled Dec  1 2009 11:42:48)
- JTAG speed: 8000 kHz (Auto)
- Initializing CPU core (Init sequence) ...
    - Initialized successfully
- JTAG speed: 8000 kHz (Auto)
- J-Link found 1 JTAG device. Core ID: 0x0032409D (ARM9)
- Flash ID (Chip 0) = 0x12249 (Verified)
- Connected successfully
Erasing selected sectors ...
- 35 of 35 sectors selected, 1 range, 0x0 - 0x1FFFFF
- RAM tested O.K.
- Erasing sector 0
- ERROR: Blank check after erase reports: Failed to erase sector 0 (0x00 - 0x3FFF) @ address 0x00
- ERROR: Failed to erase sectors
Disconnecting ...
- Disconnected