[U-Boot] Kernel hang when replace older uboot with uboot master V2

[rosysong at rosinson.com]

And I also added "root=" option to default env, it doesn't work either.

> Hi all, 
>     And When I turn off the log, its bootlog like this:
>
> U-Boot 2019.01-00079-g3420a6fc6e-dirty (Feb 19 2019 - 17:19:16 +0800)
>
> Qualcomm Atheros QCA9561 ver 1 rev 0
> Model: AP152 Reference Board
> DRAM:  128 MiB
> Loading Environment from SPI Flash... SF: Detected w25q128bv with
> page size 256 Bytes, erase size 4 KiB, total 16 MiB, mapped at
> 9f000000 *** Warning - bad CRC, using default environment
 
Here is the culprit - the on-board (tuned, setup) envs are not
accessible (or read in a wrong way).
 
Apparently the default envs doesn't have proper root=... setup.
 
Please check the env related entries in Kconfig.
 
 
Best regards