[U-Boot] [Question] How to create a file in a directory

Hi.

I was trying to write a file to FAT file system by U-Boot command.

I tried 'fatwrite' and 'save'.

I cannot create a file in a sub-directory.

fatwrite mmc 0:1 81000000 boot/a 10

created a file 'boot/a' in the root directory.

But I want a file 'a' in the directory path '/boot/'.

The directory looks like follows:

=> ls mmc 0:1 boot/ 16 boot/a 16 boot//a

2 file(s), 1 dir(s)

=> ls mmc 0:1 boot ./ ../ extlinux/ 7674090 Image.gz 5177610 rootfs.cpio.uboot 15002 uniphier-ld20-global.dtb

3 file(s), 3 dir(s)

I wrote kernel, rootfs, etc. into the '/boot' directory by mounting the device from Linux.

But, the U-Boot command cannot do likewise because U-boot recognizes '/' as a part of a file name.

Is there a solution, or am I missing something?

Thanks.