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I am using a SOM (something with Zynq 7000) that boots from an SD. While SD provides a lot of storage, i can't use it in industrial applications in a long term- it is not rated for temperature range and can come out because vibrations.
What storage could be used? I want comparable volume (0.5GB at least, the more the better) and preferably something not involving consumer grade connectos.
SD cards are common in industrial applications.
There are industrial-grade SD cards. Quick search reveals that most of them are rated for operation -40°C to +85°C, eg. Amtron.
When it comes to vibrations, there are vibration-resistant slots, like this one designed for automotive. Many (arguably most) SD slots are spring-locked, thus already resistant to vibration. That's because even for consumer devices vibration cannot be ruled out.
So unless your particular scenario presents unique challenges, SD card will work.
Aside from the fact that SD cards are actually available in a lot of temperature ranges I'd call "industrial", for devices where an vibration means that spring-fastened connectors won't do: eMMC, soldered to the board is pretty much a drop-in replacement, if your device supports both SD and eMMCs (and the Zynqs do, IIRC).
If you need interchangeability of storage media, but need to be vibration-resistant: tough problem. I'd guess my solution would probably be eMMC on a carrier board, connected via some appropriately rated connector (and/or secured using machine screws). Alternatives include booting from SPI flash (sloooow) and/or eMMC soldered onto the same board as the Zynq, and as soon as you have Linux (or even just uboot) running doing whatever your hardware supports: PCIe/NVMe, SATA or SAS (if you can load an FPGA image, why not?), USB, network...
There are SMT devices that are SD card compatible; look for eMMC or iNAND. A newer, similar technology is Universal Flash Storage (UFS). Either of these might suit your needs. Here's a parametric search that covers some of these devices.
