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A lot of people are interested in a Raspberry Pi and want to get some idea about the operating system running on Pi without the need to buy a Pi first. I actually searched for a convenient way to test a backup script called raspiBackup I wrote for the Raspberry Pi. A nice way to evaluate Raspbian or to run any tests is to use QEMU to emulate the Raspberry Pi. Note that special Pi hardware like GPIO et al cannot be simulated. It's just the processor which is simulated. You need a Raspbian image and a system with Linux or Windows. Today I configured my system to run a Pi in QEMU and in the following article I explain step by step how I installed and configured QEMU on my Debian based Linux. The image has a networking connection right after startup and will use the existing host network connection with NAT. Finally a script is provided which executes the steps described and simplifies the image creation process.
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I recently got a compute module 4 (CM4) donated to add support for NVMe in raspiBackup (See here for details). I'm used to use a Raspberry but never used a CM4 before so I had to ramp up on CM4 first. The following page describes how I managed to get a RaspbianOS (Buster) up and running on the CM4 and to boot from NVMe.
My CM4 specs: 1GB main memory, 32GB eMMC and 128GB NVMe from Hynix, no WiFi and a Waveshare Mini Base Board A (CM4-IO-BASE-A).
Note: The SD card slot on the Base Board cannot be used given my CM4 has eMMC and disables the SD card slot.
Parts
Hynix NVMe, CM4 and Waveshare Mini Base Board A (from top to bottom)
Parts assembled
Read more: Raspberry Compute Module 4 (CM4) setup guide on eMMC and NVMe