I am looking into some multi boot options and I wonder what the most common ways are of selecting boot configurations.
Suppose I have 2 Linux boot images consisting of kernel, device tree and root fs.
What are the most common ways to set img2 as next active boot image from img1 ?
- Change the u-boot environment from within the running image by using the userspace utilities.
- Use some reserved RAM area (only works with warm boot) an read this from u-boot script.
- Write something in e2prom or serial flash and read it from u-boot script.
- Hardware based selection (e.g. switch to GPIO)
Any other options I didn't think of ?
Are there also already some provisions for "fallback options" in case of failed updates ?
Any suggestions are welcome,
Marcel