EFI from usb HDD

[Michal Simek]

Hi,

I am playing with booting from USB via EFI. And I see very weird
behavior. I have burnt image with grub to USB flashdisk and I have
tested it on 3 zynqmp boards. zcu102, zcu104 and SOM Kria board.
On zcu102 grub is going to boot menu and everything is working fine as
expected.
On zcu104 and SOM Kria I am able to get grub not to menu. When I list
partitions in grub I see that only SDs are listed:
grub> ls
(hd0) (hd0,msdos1) (hd1) (hd1,msdos1)

On zcu102(working board) I also see usb(gpt) partitions and SD.
grub> ls
(hd0) (hd0,gpt2) (hd0,gpt1) (hd1) (hd1,msdos1)


On zcu104 I see one more error message
"PE image measurement failed"
But I can't see it on SOM.

U-Boot image is just the same for all boards. I am using generic
xilinx_zynqmp_virt_defconfig.

When I compare DT description for USB between zcu102 and zcu104 they are
the same. SOM doesn't have usb enabled by default (but I enabled it) but
grub starts which means that communication with USB is fine.

It is based on my latest patches available here.
u-boot/custodians/u-boot-microblaze.git (usb-efi-issue branch)

Also when I list usb I see all partitions just fine.
ZynqMP> part list usb 0

Partition Map for USB device 0  --   Partition Type: EFI

Part    Start LBA       End LBA         Name
        Attributes
        Type GUID
        Partition GUID
  1     0x00000800      0x001007fe      "Microsoft basic data"
        attrs:  0x0000000000000000
        type:   ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
        type:   data
        guid:   0e7f8b3d-296b-4720-be9d-c4687d3c4a77
  2     0x00100800      0x001197fe      "Microsoft basic data"
        attrs:  0x0000000000000000
        type:   ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
        type:   data
        guid:   8892eddc-231a-4e6e-a5e1-c310f4482fb7


Do you have any idea why on one system is working fine to get to menu
and on others there is an issue to get all partitions even u-boot is
able to see them and can work with them.

Thanks,
Michal