LS1046A QSPI boot using flex, but directing the root disk to SATA doesn't work

[DB105Z]

Hi there

I've used the standard flex-builder workflow to generate a QSPI integrated image. Now in addition, I'm trying to redirect just the root disk to SATA. 

I've tried changing Uboot's defconfig for the bootargs to be the following:

CONFIG_BOOTARGS="console=ttyS2,115200 root=/dev/sda2 rw rootwait"

That's all good and indeed those boot args do end up in the Linux kernel visible through /proc/cmdline but observing the 'mount' command, /dev/sda2 isn't being used for '/' - its still using the ram disk.

What am I missing?

[yipingwang]

Under u-boot:

=>setenv bootargs "console=ttyS1,115200 root=/dev/sda2 rw rootwait earlycon=uart8250,mmio,0x21c0500"

=>tftp 0xa0000000 Image

=>tftp 0xb0000000 dtb_file

=>booti 0xa0000000 - 0xb0000000