Check pinmux on spi0&1 on jetson-nano

Hi, Shane
The above modifications are based on Sample-Root-Filesystem_R32.3.1, Tegra210_Linux_R32.3.1 and L4T R32.3.1 BSP source code. But I finally find that the end customer’s application was based on R32.2.1.
So Could you please kindly help check which option in below will be ok? Thanks a lot.
Merging modification from R32.3.1 to R32.2.1:
1#, Only replace the Sample rootfs with R32.2.1, the others are from R32.3.1
2# use L4T sample rootfs and Linux driver package are from R32.2.1, And add my customized uboot.bin, DTB file and kernel Image which are based on L4T BSP soucecode R32.3.2
3# use the L4T sample rootfs, Linux driver package, L4T BSP source code are from R32.2.1. Then apply the modifications to sourcecode. Then rebuild the binaries and program the board.

The 2 and 3 both should be OK.