How to Flash kernel and device tree using flash writer instead using nfs
Fragment of a discussion from Talk:R-Car/Boards/Yocto-Gen3
Can the following information help you?(Note:The "Program Top Address" is different according to Yocto version)
H3 Starter Kit case: https://elinux.org/R-Car/Boards/H3SK#Flashing_firmware
M3 Starter Kit case: https://elinux.org/R-Car/Boards/M3SK#Flashing_firmware