flatcar
sys-kernel/coreos-modules: Enable EFI_ZBOOT for arm64
Enable EFI_ZBOOT for arm64
Arm64 now supports booting a compressed kernel through EFI. This is hidden behind the EFI_ZBOOT Kconfig option. The EFI_ZBOOT is only enabled in the arm64 config because it is not available for x86. X86 relies on an architecture specific compression mechanism on EFI. The KERNEL_ZSTD Kconfig option applies to both arches so move it to commonconfig. The other change required is that the kernel image name changes.
In my local build it looks like the kernel size goes down from 59MB to 43MB.
How to use
Build an arm64 image and boot it.
Testing done
Build tested only.
- [ ] Changelog entries added in the respective
changelog/directory (user-facing change, bug fix, security fix, update) - [ ] Inspected CI output for image differences:
/bootand/usrsize, packages, list files for any missing binaries, kernel modules, config files, kernel modules, etc.
Looks like grub 2.02 doesn't like the change:
[0m[30m[40m[2J[01;01H[0m[37m[40m[02;30HGNU GRUB version 2.02
[04;02H/----------------------------------------------------------------------------\[05;02H|[05;79H|[06;02H|[06;79H|[07;02H|[07;79H|[08;02H|[08;79H|[09;02H|[09;79H|[10;02H|[10;79H|[11;02H|[11;79H|[12;02H|[12;79H|[13;02H|[13;79H|[14;02H|[14;79H|[15;02H|[15;79H|[16;02H|[16;79H|[17;02H|[17;79H|[18;02H|[18;79H|[19;02H|[19;79H|[20;02H|[20;79H|[21;02H|[21;79H|[22;02H|[22;79H|[23;02H|[23;79H|[24;02H|[24;79H|[25;02H|[25;79H|[26;02H|[26;79H|[27;02H|[27;79H|[28;02H|[28;79H|[29;02H|[29;79H|[30;02H|[30;79H|[31;02H|[31;79H|[32;02H|[32;79H|[33;02H|[33;79H|[34;02H|[34;79H|[35;02H|[35;79H|[36;02H|[36;79H|[37;02H|[37;79H|[38;02H|[38;79H|[39;02H|[39;79H|[40;02H|[40;79H|[41;02H|[41;79H|[42;02H|[42;79H|[43;02H\----------------------------------------------------------------------------/[44;02H[45;02H Use the ^ and v keys to select which entry is highlighted.
Press enter to boot the selected OS, `e' to edit the commands
before booting or `c' for a command-line. [05;80H [0m[30m[47m[05;03H*Flatcar default [0m[37m[40m[05;78H[06;03H Flatcar USR-A [06;78H[07;03H Flatcar USR-B [07;78H[08;03H [08;78H[09;03H [09;78H[10;03H [10;78H[11;03H [11;78H[12;03H [12;78H[13;03H [13;78H[14;03H [14;78H[15;03H [15;78H[16;03H [16;78H[17;03H [17;78H[18;03H [18;78H[19;03H [19;78H[20;03H [20;78H[21;03H [21;78H[22;03H [22;78H[23;03H [23;78H[24;03H [24;78H[25;03H [25;78H[26;03H [26;78H[27;03H [27;78H[28;03H [28;78H[29;03H [29;78H[30;03H [30;78H[31;03H [31;78H[32;03H [32;78H[33;03H [33;78H[34;03H [34;78H[35;03H [35;78H[36;03H [36;78H[37;03H [37;78H[38;03H [38;78H[39;03H [39;78H[40;03H [40;78H[41;03H [41;78H[42;03H [42;78H[42;80H [05;78H[48;01H The highlighted entry will be executed automatically in 1s. [05;78H[48;01H The highlighted entry will be executed automatically in 0s. [05;78H[0m[30m[40m[2J[01;01H[0m[37m[40m[0m[30m[40m[2J[01;01H[0m[37m[40m Booting `Flatcar default'
error: invalid magic number.
This needs some investigation.
This is from these test cases:
17:10:57 ########### Some tests failed and will be re-run (5 / 5). ###########
17:10:57 Failed tests:
17:10:57 extra-test.[first_dual].cl.update.docker-btrfs-compat
17:10:57 extra-test.[first_dual].cl.update.oem
17:10:57 extra-test.[first_dual].cl.update.payload
![github-actions[bot] avatar](https://avatars.githubusercontent.com/in/15368?v=4 "Published by a pub.dev verified publisher"){kind=small}
Looks like this is what changed things: https://github.com/torvalds/linux/commit/29636a5ce87bebab38c533175d72bb800a7581b8
So this is blocked until we come up with a solution.
This is the grub commit that dropped the magic number check (using RH fork because the canonical grub repo is not on github): https://github.com/rhboot/grub2/commit/69edb31205602c29293a8c6e67363bba2a4a1e66
This went in between 2.06 and 2.12.
