我正在引导内核（arm，cortexa15），并且内核挂在：
## Booting kernel from Legacy Image at 40007fc0 ...
Image Name: Linux-4.4.138-cip25-rt19-yocto-s
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 5510400 Bytes = 5.3 MiB
Load Address: 40008000
Entry Point: 40008000
Verifying Checksum ... OK
## Flattened Device Tree blob at 40f00000
Booting using the fdt blob at 0x40f00000
XIP Kernel Image ... OK
Loading Device Tree to 40ef1000, end 40effb37 ... OK
Starting kernel ...
我试图使Earlyprintk知道内核卡在哪里。
CONF_PRINTK=y
CONF_EARLY_PRINTK=y
CONFIG_DEBUG_LL=y (low-level debug)
# CONFIG_DEBUG_ICEDCC is not set
并设置bootargs：
> setenv bootargs ${bootargs_base} earlyprintk
但是，控制台上没有打印消息。有人可以帮忙吗？