[U-Boot] [BeagleBone Black] Possible bug in U-Boot efi loader for BeagleBone Black

Thu Dec 13 16:07:24 UTC 2018

Hello Heinrich,

I have build the newest GRUB from master branch and I have checked out 
U-Boot with this patch:

http://git.denx.de/?p=u-boot.git;a=commit;h=f31239acff61f7def88a06eef1f091fce74ecd61
Revert "efi_loader: remove efi_exit_caches()"

and I still get an error while Linux booting :

EFI stub: Booting Linux Kernel...
EFI stub: Using DTB from configuration table
EFI stub: Exiting boot services and installing virtual address map...
efi_runtime_relocate: Relocation at 9ff57a20 is out of range (20081092)
data abort
pc : [<9ff57944>]          lr : [<9ff57a31>]
reloc pc : [<80800944>]    lr : [<80800a31>]
sp : 9df2b594  ip : 1f757000     fp : 00000000
r10: 00002000  r9 : 9df36eb8     r8 : 00000028
r7 : 9ff57bc8  r6 : 9ff5807c     r5 : 00000003  r4 : 9ff57c28
r3 : 20027c78  r2 : 00000050     r1 : 9ff57c28  r0 : ffffffff
Flags: NzCv  IRQs off  FIQs on  Mode SVC_32
Code: 46216120 f876f000 bd106120 4b36b5f0 (b31c681c)
UEFI image [0x9cebf000:0x9cf21bff] '/\grub.efi'
UEFI image [0x94732000:0x95115fff]
Resetting CPU ...

resetting ...

I can boot Linux only when I remove line: efi_update_table_header_crc32(&efi_runtime_services.hdr); (file lib/efi_loader/efi_runtime.c line: 344 ) .

Best regards,
Dominik

On 12/12/18 7:11 PM, Heinrich Schuchardt wrote:

> On 12/12/18 3:02 PM, Dominik Adamski wrote:
>> 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 at 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
>>
>>
> Hello Dominik,
>
> you refer to an outdated release candidate v2018.09-rc2.
>
> The following patch is missing in the release candidate:
>
> commit 483dbab9f9318149e5ea97daacbfae320f53e35a
> Author: Heinrich Schuchardt <xypron.glpk at gmx.de>
> Date:   Sun Jul 29 09:49:03 2018 +0200
>
>      lib: crc32: mark function crc32() as __efi_runtime
>
> It is contained in the v2018.09 release. Please, update your page
> https://github.com/DominikAdamski/Beaglebone_GRUB_Manual accordingly.
>
> The latest release is v2018.11. Release v2018.11 will require a recent
> GRUB (later than patch d0c070179d4d). Or apply the following patch
> http://git.denx.de/?p=u-boot.git;a=commit;h=f31239acff61f7def88a06eef1f091fce74ecd61
> Revert "efi_loader: remove efi_exit_caches()"
>
> Best regards
>
> Heinrich