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AM625-Q1: May I know how to flash "UBIFS rootfs" into OSPI flash by DFU?

Part Number: AM625-Q1

Dear Expert,

This is extened discussion of this thread,

AM625: DDR4 (NT5AD256M16E4-JRI) Initialized failed in tiboot3

(a) We already boot success by dfu, and We can flash bootloader (u-boot.img/tispl.bin/tiboot3.bin) in to OSPI NAND flash. ref,

(1) AM625-Q1: How to flash OSPI_NOR (+OSPI_NAND) flash by DFU booting

(2) AM625: Custom board - DFU - tiboot3.bin

(b) and we know how to create UBIFS rootfs. (3.2.2.20. UBIFS)

Cusomer's board only have OSPI NAND w/o eMMC/ethernet

Follow item (a) & (b), May I know how to flash "UBIFS rootfs" into OSPI flash by DFU?

Thank You.

Gibbs