Use of nx devkit as usb cardreader at host PC? not possible?

[Andrey1984]

I am trying to boot from sdcard
the latter is in microusb of nx devkit
boot menu shows gadget uefi/ gadget non uefi options
but neither works for booting
any ideas?

[Andrey1984]

how to grow size of this partition ? from 16mb to e.g. 16gb?

sdc      8:32   1    16M  0 disk /media/nvidia/L4T-README

[linuxdev]

It wouldn’t be bootable, but basically the file is just an empty file created with dd to be an exact multiple of the sector size (512 bytes), and then formatted under loopback. Example:

# Note: 16GB = 16*1024*1024*1024 = 17179869184
# 17179869184/512 = 33554432
dd if=/dev/zero of=/my_image.img bs=512 count=33554432
# Below assumes `losetup` produces file "`/dev/loop0`". This just lists what it will be:
sudo losetup -f
# This covers the file:
sudo losetup -f ./my_image.img
# Format it as VFAT:
sudo mkfs.vfat /dev/loop1

You could then detach the loop device with “sudo losetup -d /dev/loop1” (there are only so many loop devices available, be sure to not have a “loop device leak”, like a memory leak, but a device special file version).

This would not provide a bootable device or partition…what it would provide is the files within that synthetic block device to be served. Content is not equal to device type as a binary block device.

[Andrey1984]

seems the task is rather unsoluble in the context of nx devkit application for booting a computer from it using a bootable mini sdcard inserted in jetson, given the latter is connected to the Host PC via usb-mini