mtk6735抓取logo抓到一半就死机了？怎么解

mt6735的，我用串口抓LOG
但到  0.000000][BL31] Final dump！这里就停了，什么情况
机器是正常运行的，就是LOG停止了
我编的是eng版的，看下printk.disable_UART=0，这具是正确的呢
小伙伴说要到printk.c设置永不关闭
我已经把这个printk.disable_uart全部改为0了，还是没有用
代码如下：
[ATF][     0.000000]mt_log_setup - ATF_CRASH_LAST_LOG_SIZE : 0x8000
[ATF][     0.000000]mt_log_setup - ATF_EXCEPT_BUF_SIZE_PER_CPU : 0x1000
[ATF][     0.000000]mt_log_setup - ATF_EXCEPT_BUF_SIZE : 0x8000
[ATF][     0.000000]mt_log_setup - PLATFORM_CORE_COUNT : 0x8
[ATF][     0.000000]mt_log_setup - atf_except_write_pos_per_cpu[0]: 0x7fff4000
[ATF][     0.000000]mt_log_setup - atf_except_write_pos_per_cpu[1]: 0x7fff5000
[ATF][     0.000000]mt_log_setup - atf_except_write_pos_per_cpu[2]: 0x7fff6000
[ATF][     0.000000]mt_log_setup - atf_except_write_pos_per_cpu[3]: 0x7fff7000
[ATF][     0.000000]mt_log_setup - atf_except_write_pos_per_cpu[4]: 0x7fff8000
[ATF][     0.000000]mt_log_setup - atf_except_write_pos_per_cpu[5]: 0x7fff9000
[ATF][     0.000000]mt_log_setup - atf_except_write_pos_per_cpu[6]: 0x7fffa000
[ATF][     0.000000]mt_log_setup - atf_except_write_pos_per_cpu[7]: 0x7fffb000
[ATF][     0.000000]mt_log_setup - atf_crash_flag : 0x0
[ATF][     0.000000]mt_log_setup - atf_crash_log_addr : 0x0
[ATF][     0.000000]mt_log_setup - atf_crash_log_size : 0x0
[ATF][     0.000000]ATF log service is registered (0x7ffc0000, aee:0x7fffc000)
[ATF][     0.000000]BL3-1: v1.0(debug):6e6b948
[ATF][     0.000000]BL3-1: Built : 20:30:17, Jul 20 2016
INFO:    BL3-1: Initializing runtime services
[ATF][     0.000000][BL31] Jump to FIQD for initialization！
INFO:    BL3-1: Preparing for EL3 exit to normal world, LK
INFO:    BL3-1: Next image address = 0x41e00000
INFO:    BL3-1: Next image spsr = 0x1d3
[ATF][     0.000000][BL31] Final dump！
 @              
  B

CTRL-A Z for help |921600 8N1 | NOR | Minicom 2.4    |

搜这个Final dump也没有朋友说要看下串口IO口内核映射有无问题。
现在还没有解决求大神帮忙！