Currently u-boot completely gets block-io objects (and their associated device-paths) wrong, which prevents grub2 from figuring out the boot device+partition, which prevents it from automatically finding it's grub.cfg.
Currently efi_loader creates a block-io object per disk, for example on a board with 3 partitions on an sd-card and 4 partitions on a usb disk:
/File(sdhci@07864000.blk)/EndEntire /File(usb_mass_storage.lun0)/EndEntire
at least grub manages to match up the loaded_image device-path, but it cannot figure out which partition it was on. So you end up with prefix=(hd1)/EFI/fedora instead of prefix=(hd1,msdos1)/EFI/fedora. With this patchset, you end up with:
/ACPI(133741d0,0)/UnknownMessaging(1d)/EndEntire /ACPI(133741d0,0)/UnknownMessaging(1d)/HD(0,800,64000,0000000000000000,1,0)/EndEntire /ACPI(133741d0,0)/UnknownMessaging(1d)/HD(1,64800,200000,0000000000000000,1,0)/EndEntire /ACPI(133741d0,0)/UnknownMessaging(1d)/HD(2,264800,19a000,0000000000000000,1,0)/EndEntire /ACPI(133741d0,0)/USB(0,0)/USB(0,0)/USB(0,0)/EndEntire /ACPI(133741d0,0)/USB(0,0)/USB(0,0)/USB(0,0)/HD(0,800,60000,0000000000000000,1,0)/EndEntire /ACPI(133741d0,0)/USB(0,0)/USB(0,0)/USB(0,0)/HD(1,61000,155000,0000000000000000,1,0)/EndEntire /ACPI(133741d0,0)/USB(0,0)/USB(0,0)/USB(0,0)/HD(2,20fa800,1bbf8800,0000000000000000,1,0)/EndEntire /ACPI(133741d0,0)/USB(0,0)/USB(0,0)/USB(0,0)/HD(3,1b6800,1f44000,0000000000000000,1,0)/EndEntire
(Note that "UnknownMessaging(1d)" is actually the MMC node in the device- path, but grub wasn't updated to print out some of the newer device-path sub-types.)
Since we use DM to generate the device-paths from u-boot's device hierarchy, legacy devices will still be broken. I kept them working as they did previously and tried to minimize the ifdeffery, but things will get much cleaner when legacy support is removed.
Peter Jones (1): efi: add some more device path structures
Rob Clark (3): efi_loader: add udevice to EFI device-path mapping efi_loader: make disk objects for partitions efi_loader: use efi_devpath to get correct boot device-path
cmd/bootefi.c | 31 ++++++-- include/efi_api.h | 49 +++++++++++- include/efi_loader.h | 9 +++ lib/efi_loader/Makefile | 1 + lib/efi_loader/efi_devpath.c | 175 +++++++++++++++++++++++++++++++++++++++++++ lib/efi_loader/efi_disk.c | 73 +++++++++++++----- 6 files changed, 311 insertions(+), 27 deletions(-) create mode 100644 lib/efi_loader/efi_devpath.c