Public bug reported: Impact ======
The proposed version supports booting Ubuntu on the Raspberry Pi 4, both by providing a Pi 4 compatible variant of u-boot (which requires the version bump to 2019.07), and by detecting and (if required) migrating the boot configuration to support the Pi 4 (by calling different u-boot binaries depending upon the host Pi's version). The package has been built in the following PPA: https://launchpad.net/~waveform/+archive/ubuntu/ubpi4/+packages A git-ubuntu branch with the proposed changes is available at: https://code.launchpad.net/~waveform/ubuntu/+source/u-boot/+git/u-boot/+ref/ubuntu-2019.07-pi4 (the version in this branch is lower than the PPA as the branch has been rebased for clarity, compressing all the minor modifications done during testing) Test Case ========== Upon installing the new package on a system with the existing u-boot setup (a single u-boot binary under /boot/firmware and a config.txt that points to it as the kernel), the postinst script should detect this scenario and migrate the configuration to one with multiple u-boot binaries under /boot/firmware and a config.txt with selective sections pointing to them. After installation, the card should still boot successfully on all supported models (at present the Pi4 will only get to the u-boot stage, pending kernel work). This process has been tested on the Pi 2 (armhf only), 3, 3A+, 3B+, and 4 (under armhf and arm64 on relevant platforms). The scripts for detecting and migrating the old boot configuration to the new have been tested with the Eoan and Bionic boot configurations, with a view to eventual SRU of this package to Bionic (for Pi 4 support on LTS). Regression Potential ==================== Testing with the older Bionic firmware led to several changes (that led to re-testing on the Eoan firmware), which has increased confidence in the low probability of regressions at least as regards the Pi. The certification team will test other relevant platforms using u-boot to ensure they are still capable of booting with the 2019.07 version (other than the pi's postinst script, no other scripts have changed so boot capability is all that requires testing). The boot config migration code takes some pains to detect the old and new states, both by hash checking and (as fallback) by rudimentary content analysis. It is conservative in choosing when to migrate (only when both a package version check passes and detection confirms the old boot configuration is present), and provides a backup of the original configuration (in fact, an "unmigration" routine is included in the library, primarily for testing). At this point, the major concern for regression is other platforms relying upon u-boot. ** Affects: u-boot (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1846329 Title: [FFe] 2019.07 to support Pi4 boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/u-boot/+bug/1846329/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
