When I plug my Micro SD card into the carrier board of my Nano, gnome-disks doesn’t show my external SD card. How do I fix this without reflashing the Nano image to the eMMC? (I really don’t want to do that)
I’m a total noob at this stuff so detailed step by step processes are much appreciated. Thanks!
Keep in mind that if you purchased a third party carrier board+module, then this is different hardware layout than a development kit. The third party carrier board should work with an SD card, but it requires their software to flash it, not the software for the dev kit (well, it is the same if their layout is the same; the SD card of a dev kit though differs than what an eMMC model has, and so there are device tree and driver changes to their software in order that the SD card be recognized). The supplier would probably answer about why the SD card is not recognized.
Looks like that is indeed a dev kit. I do want to suggest though that when you get it you will probably still want to flash it with the most recent JetPack/SDK Manager. This requires an Ubuntu 18.04 host PC (often multiboot is preferable to a VM). The SD card models have QSPI memory on the module (which supplements the missing eMMC) which is used for boot, and the flash is for QSPI and not just the SD card (there are SD card images available, but they only work if the QSPI flashed content is a matching release). Here is a list of L4T releases (which is what actually gets flashed, and matches a given JetPack/SDKM release), and JetPack/SDKM releases: https://developer.nvidia.com/linux-tegra https://developer.nvidia.com/embedded/jetpack-archive
I mention this in part because I saw L4T R32.7.3 was just released. Whatever you get on the dev kit is probably several releases old.
That is correct. Often people only install an SD card image and fail to perform the QSPI flash. This might work if the prior QSPI is compatible, but across new version releases, it is likely to fail in some manner without that step.