On Mon Oct 21, 2024 at 5:16 PM CEST, Pascal Hambourg wrote: > On 21/10/2024 at 10:26, Diederik de Haas wrote: > > On Sun Oct 20, 2024 at 8:49 PM CEST, Pascal Hambourg wrote: > >> On 20/10/2024 at 16:28, Diederik de Haas wrote: > >>> > >>> ``` > >>> root@cs21:~# parted -s /dev/mmcblk1 print > >>> Model: MMC NCard (sd/mmc) > >>> Disk /dev/mmcblk1: 61.9GB > >>> Sector size (logical/physical): 512B/512B > >>> Partition Table: gpt > >>> Disk Flags: > >>> > >>> Number Start End Size File system Name Flags > >>> 1 32.8kB 16.8MB 16.7MB primary > >>> 2 16.8MB 256MB 239MB fat16 primary boot, esp > >>> 3 256MB 61.9GB 61.6GB ext4 primary > >>> > >>> root@cs21:~# lsblk -o +PARTFLAGS,FSTYPE /dev/mmcblk1 > >>> NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS PARTFLAGS FSTYPE > >>> mmcblk1 179:0 0 57.6G 0 disk > >>> ├─mmcblk1p1 179:1 0 16M 0 part > >>> ├─mmcblk1p2 179:2 0 228M 0 part /boot/efi vfat > >>> └─mmcblk1p3 179:3 0 57.4G 0 part / ext4 > >>> ``` > >> > >> Partition 2 looks like a regular EFI partition mounted on /boot/efi as > >> expected by GRUB. With a size of 239MB it should be FAT32 instead of > >> FAT16, but maybe the UEFI firmware expects only FAT16 or does not care. > > > >>> So it looks like it just needs some indication (flag) of what the boot > >>> device is, but it doesn't (seem to) matter which one. > >> > >> Weird. Does it have to be on the boot/root partition or can it be on any > >> other partition ? > > > > It appears to not matter if it's 'boot' or 'legacy_boot', but it (ofc?) > > needs to be set on the partition with the kernel as that needs to be > > started for the rest of the boot process. > > But in cs21's partition table, the boot/esp flag is on the EFI > partition, not the root partition. Does it mean that the kernel is > installed in the EFI partition instead of the root partition ? Or is the > "kernel" a secondary EFI boot loader such as GRUB ?
Good point, my use of 'kernel' was inaccurate. After u-boot does its thing, it handles control over to 'something' which continues the boot process. In most of my cases that is the kernel, but on cs21 I _think_ that it indeed handles things over to GRUB which then starts the requested system/kernel. On cs21 I do have `grub-efi-arm64` installed, but I don't know much about EFI things, but it works so I had no reason to change it. Cheers, Diederik
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