Hello, I think that I have found a bug in U-Boot UEFI implementation for BeagleBone Black board.
I have tested U-Boot UEFI implementation for BeagleBone Black. I am able to load Linux successfully via GRUB bootloader with U-Boot v2018.09-rc2 . U-Boot v2018.09-rc3 and above versions cause that the platform restarts over and over again. It starts booting, then it loads GRUB and when GRUB finishes its work an error occurs and the board restarts.
I have looked through U-Boot repository and I have found the commit, which breaks booting. It's name is as follows: "efi_loader: update runtime services table crc32" (commit ID: a39f39cdd8be5cd3e7a8b696a463b621e3d827e0 ) . I have figured out, that when I comment out function call: efi_update_table_header_crc32(&efi_runtime_services.hdr); in function efi_runtime_detach then I am able to launch Linux successfully.
My setup of U-Boot, GRUB and Linux was as follows: https://github.com/DominikAdamski/Beaglebone_GRUB_Manual . For U-Boot v2018.09 I get following log when booting:
U-Boot 2018.09 (Dec 11 2018 - 11:11:16 +0100)
CPU : AM335X-GP rev 2.1 Model: TI AM335x BeagleBone Black DRAM: 512 MiB NAND: 0 MiB MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1 Loading Environment from FAT... *** Warning - bad CRC, using default environment
No USB device found <ethaddr> not set. Validating first E-fuse MAC Net: eth0: ethernet@4a100000 Hit any key to stop autoboot: 2 ^H^H^H 1 ^H^H^H 0 switch to partitions #0, OK mmc0 is current device SD/MMC found on device 0 ** Unable to read file boot.scr ** 85 bytes read in 1 ms (83 KiB/s) Loaded env from uEnv.txt Importing environment from mmc0 ... Running uenvcmd ... 403968 bytes read in 28 ms (13.8 MiB/s) ^[[18tScanning disks on usb... Disk usb0 not ready Disk usb1 not ready Disk usb2 not ready Disk usb3 not ready Scanning disks on mmc... MMC Device 2 not found MMC Device 3 not found Found 4 disks WARNING: booting without device tree ## Starting EFI application at 82000000 ... ^[[?25h^[[0;30;47mWelcome to GRUB! ^M ^M^[[0;37;40m^[[0;37;40m^[[0;37;40mEFI stub: Booting Linux Kernel...^M EFI stub: Using DTB from configuration table^M EFI stub: Exiting boot services and installing virtual address map...^M U-Boot EFI: Relocation at 9ff4a8a8 is out of range (2008214f) data abort pc : [<9ff4a7cc>] lr : [<9ff4a8b9>] reloc pc : [<808007cc>] lr : [<808008b9>] sp : 9df1ebac ip : 00000020 fp : 00000000 r10: 00001000 r9 : 9df29eb8 r8 : 00000028 r7 : 9ff4aa10 r6 : 9ff4aec4 r5 : 00000003 r4 : 9ff4aa70 r3 : 2002aac0 r2 : 00000050 r1 : 9ff4aa70 r0 : ffffffff Flags: NzCv IRQs off FIQs on Mode SVC_32 Code: 61204621 f876f000 bd106120 b5f04b36 (b31c681c) UEFI image [0x9ceb1000:0x9cf139ff] '/\grub.efi' UEFI image [0x94728000:0x9510bfff] Resetting CPU ...
resetting ...
Please let me know, if I should add more detailed logs.
Dominik Adamski