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am3359 icev2 开发板，uboot 引导内核，内核正常运行，但是在显示Starting kernel后控制台无信息打印，内核的调试串口如何修改？

郑州--大胜
Intellectual 370 points
Other Parts Discussed in Thread: AM3359

您好：

      am3359 icev2 开发板，uboot 引导内核，内核正常运行，但是在显示Starting kernel后控制台无信息打印，内核的调试串口如何修改？

方法：

U-Boot# set ipaddr 192.168.1.117; set serverip 192.168.1.116

U-Boot# tftp 0x83000000 am335x-evm.dtb

U-Boot# tftp 0x82000000 uImage

U-Boot# bootm 0x82000000 - 0x83000000
bootm 0x82000000 - 0x83000000


=> bootm 0x82000000 - 0x83000000
## Booting kernel from Legacy Image at 82000000 ...
 Image Name: Linux-4.4.19-rt25-gf572d285f0
 Created: 2016-12-20 13:13:59 UTC
 Image Type: ARM Linux Kernel Image (uncompressed)
 Data Size: 3414008 Bytes = 3.3 MiB
 Load Address: 80008000
 Entry Point: 80008000
 Verifying Checksum ... OK
## Flattened Device Tree blob at 83000000
 Booting using the fdt blob at 0x83000000
 Loading Kernel Image ... OK
 Loading Device Tree to 8ef23000, end 8ef2f727 ... OK


Starting kernel ...


之后无信息，显示，但是lcd显示器，有数据显示，说明内核已经运行，


请问，该如何编译内核，或修改，使其能够串口输入日志信息？？？