Unify partition layout: 2GB (EFI) + 4GB (rootfs)

[rene]

Description

In order to keep backward compatibility, the partition layout of non eve-k variants has been kept the same since version 10.2.0, where EFI and rootfs partitions (IMGA/IMGB) are partitioned as the following:

• EFI - 36MB
• IMGA - 512MB
• IMGB - 512MB

Commit 5db29bd fixed partition layout for eve-k as the following:

• EFI - 2GB
• IMGA - 4GB
• IMGB - 4GB

This new layout allows not only the growing of rootfs but also the growing of EFI space for new features, if required.

This commit unifies partition layout across all EVE variants, so all images should have the same scheme: EFI (2GB), IMGA/IMGB (4GB).

The 300MB limitation is not changed, so generic rootfs images can still be upgraded from the remote controller. However, for NVIDIA variants the maximum size is set to 4GB. This is a requirement for the Jetpack 7.1, which has exceeded the current size limit.

How to test and validate this PR

Run lsblk and verify the size of the partitions match:

1. EFI: 2G
2. IMGA: 4G
3. IMBB: 4G

Changelog notes

Unify partition layout to a consistent 2GB (EFI) + 4GB (rootfs) scheme across all EVE variants, including eve-k and eve-kvm, eliminating per-variant differences.

PR Backports

This is a "new feature", so no backports.

Checklist

• I've provided a proper description
• I've added the proper documentation
• I've tested my PR on amd64 device
• I've tested my PR on arm64 device
• I've written the test verification instructions
• I've set the proper labels to this PR
• I've checked the boxes above, or I've provided a good reason why I didn't
  check them.

[rucoder]

@rene wy we need 2GB for EFI? even windows uses ~300Mb for dual boot

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 29.87%. Comparing base (2281599) to head (5e73a72).
⚠️ Report is 418 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@ ## master #5735 +/- ## =========================================== + Coverage 19.52% 29.87% +10.34%  =========================================== Files 19 18 -1 Lines 3021 2417 -604 =========================================== + Hits 590 722 +132  + Misses 2310 1549 -761  - Partials 121 146 +25 

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[eriknordmark]

LGTM

[rene]

@rene wy we need 2GB for EFI? even windows uses ~300Mb for dual boot

@rucoder , for now the only reason is solely to keep compatibility with eve-k, so both have the same size. There was a discussion in the past about change the boot mechanism to be more compatible with standard schemes, where kernel + initrd stays in the EFI partition and also put more dtbs and other firmware files required for Raspberry Pi and other arm64 devices. Open room for EVE 2.0 (if needed) was also considered. Is 2GB exaggerated? I think so, but TBH I wasn't involved in all these discussions and I don't recall all the details, I believe there were more plans to justify this size. I don't mind to reduce the EFI size, but at the same time, I don't see issues to just follow what is in eve-k and keep a very big room for feature changes that won't hit us with space issues again. So my final vote is just to keep it as it is (2GB)....