新入手的一个荔枝派Nano，想玩4G模块拨号，重新编译linux内核增加了ppp模块，但是启动的时候内核启动失败，可以有大佬提点一下吗？
使用即食的Nano_tf_480272.dd刷到SD卡，系统正常运行，但是使用chat拨号提示没有ppp支持，
于是选择了ppp支持，重新编译，然后替换了扇区1里面的zImage
启动就失败了
`Connecting to COM4…
Connected.
U-Boot SPL 2018.01-05676-g00188782ee (Apr 08 2018 - 16:10:25)
DRAM: 32 MiB
Trying to boot from MMC1
U-Boot 2018.01-05676-g00188782ee (Apr 08 2018 - 16:10:25 +0800) Allwinner Technology
CPU: Allwinner F Series (SUNIV)
Model: Lichee Pi Nano
DRAM: 32 MiB
MMC: SUNXI SD/MMC: 0
SF: unrecognized JEDEC id bytes: 0b, 40, 18
*** Warning - spi_flash_probe_bus_cs() failed, using default environment
Setting up a 480×272 lcd console (overscan 0×0)
In: serial@1c25000
Out: serial@1c25000
Err: serial@1c25000
Net: No ethernet found.
starting USB…
No controllers found
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1…
Found U-Boot script /boot.scr
reading /boot.scr
280 bytes read in 16 ms (16.6 KiB/s)
Executing script at 80c50000
reading suniv-f1c100s-licheepi-nano.dtb
8553 bytes read in 28 ms (297.9 KiB/s)
reading zImage
3677160 bytes read in 239 ms (14.7 MiB/s)
Flattened Device Tree blob at 80c00000
Booting using the fdt blob at 0×80c00000
Loading Device Tree to 80e60000, end 80e65168 … OK
Starting kernel …
U-Boot SPL 2018.01-05676-g00188782ee (Apr 08 2018 - 16:10:25)
DRAM😃RAM initialization failed: dram[0×1] != 0×0.
`
