BISECTED f3866909e350 ("distro_bootcmd: call EFI bootmgr even without having /EFI/boot")

[Matwey V. Kornilov]

вс, 6 июн. 2021 г. в 18:20, Heinrich Schuchardt <xypron.glpk at gmx.de>:
>
> On 6/6/21 4:37 PM, Matwey V. Kornilov wrote:
> > Hi,
> >
> > I've found that
> >
> > f3866909e350 ("distro_bootcmd: call EFI bootmgr even without having /EFI/boot")
> >
> > breaks running EFI application from USB device on BeagleBone Black
> > (am335x) device.
> >
> > With this patch I see the following:
> >
> > Booting /efi\boot\bootarm.efi
> > Welcome to GRUB!
> >
> > data abort
> > pc : [<9ce0b6d0>]          lr : [<9ffab7c7>]
> > reloc pc : [<7d69d6d0>]    lr : [<8083d7c7>]
> > sp : 9df44e28  ip : 9ffdfe90     fp : 00000003
> > r10: 9ffe3300  r9 : 00000000     r8 : 9df6fe88
> > r7 : 00000000  r6 : 9ce5da08     r5 : 9ce571f8  r4 : 9ce2c040
> > r3 : 00000000  r2 : 00000001     r1 : 9ce56598  r0 : 00000000
> > Flags: NzCv  IRQs off  FIQs on  Mode SVC_32
> > Code: e3500000 0a000015 e590000c eb00f96e (e5d03000)
>  > UEFI image [0x9ce46000:0x9cf28fff] '/efi\boot\bootarm.efi'
>  > Resetting CPU ...
>
> Hello Matwey,
>
> thank you for reporting the issue.
>
> $ echo 'Code: e3500000 0a000015 e590000c eb00f96e (e5d03000)' |
> CROSS_COMPILE=arm-linux-gnueabihf- ARCH=arm scripts/decodecode
>
> Code: e3500000 0a000015 e590000c eb00f96e (e5d03000)
> All code
> ========
>     0:   e3500000        cmp     r0, #0
>     4:   0a000015        beq     0x60
>     8:   e590000c        ldr     r0, [r0, #12]
>     c:   eb00f96e        bl      0x3e5cc
>    10:*  e5d03000        ldrb    r3, [r0]                <-- trapping
> instruction
>
> Code starting with the faulting instruction
> ===========================================
>     0:   e5d03000        ldrb    r3, [r0]
>
> Looking at the disassembly above we see that reading memory location
> NULL fails.
>
> We need to find out where the exception occurs. The code position is
> neither in bootarm.efi nor in U-Boot (9ce0b6d0 is lower than the load
> position of bootarm.efi, so it is below the relocated U-Boot code).
>
> Please, add the following line at the start of grub.cfg to get more
> output from GRUB:
>
>         debug=all

This doesn't provide any additional output from GRUB :(

>
> When building U-Boot, please, add
>
>         #define DEBUG 1
>
> in lib/efi_loader/efi_disk.c and lib/efi_loader_file.c a line before
> #include <common.h>.


This doesn't provide much output as well:

Scanning disk mmc at 48060000.blk...
EFI: Call: efi_install_multiple_protocol_interfaces( &handle,
&efi_guid_device_path, diskobj->dp, &efi_block_io_guid, &diskobj->ops,
NULL)
EFI: 0 returned by efi_install_multiple_protocol_interfaces( &handle,
&efi_guid_device_path, diskobj->dp, &efi_block_io_guid, &diskobj->ops,
NULL)
** Unrecognized filesystem type **
Scanning disk mmc at 481d8000.blk...
EFI: Call: efi_install_multiple_protocol_interfaces( &handle,
&efi_guid_device_path, diskobj->dp, &efi_block_io_guid, &diskobj->ops,
NULL)
EFI: 0 returned by efi_install_multiple_protocol_interfaces( &handle,
&efi_guid_device_path, diskobj->dp, &efi_block_io_guid, &diskobj->ops,
NULL)
EFI: Call: efi_install_multiple_protocol_interfaces( &handle,
&efi_guid_device_path, diskobj->dp, &efi_block_io_guid, &diskobj->ops,
NULL)
EFI: 0 returned by efi_install_multiple_protocol_interfaces( &handle,
&efi_guid_device_path, diskobj->dp, &efi_block_io_guid, &diskobj->ops,
NULL)
Found 3 disks


> Best regards
>
> Heinrich
>
> >
> > while without the patch, GRUB works as usual.
> > Could you please help me to figure out what is going wrong here?
> >



-- 
With best regards,
Matwey V. Kornilov