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

Matwey V. Kornilov matwey.kornilov at gmail.com
Mon Jun 7 19:51:47 CEST 2021 

вс, 6 июн. 2021 г. в 19:47, Heinrich Schuchardt <xypron.glpk at gmx.de>:
>
> On 6/6/21 6:21 PM, Heinrich Schuchardt wrote:
> > On 6/6/21 5:42 PM, Matwey V. Kornilov wrote:
> >> 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
> >
> > This implies that GRUB is crashing before even accessing the file system
> > (including grub.cfg).
> >
> > On an OrangePi PC I deleted /boot.scr and moved grubarm.efi to
> > /EFI/boot/bootarm.efi. It boots without problem.
> >
> > What version of GRUB are you using?
> > How were you booting before updating U-Boot?
> > What version of U-Boot are you using where the error occurs?
> > Why do you have grub in /EFI/boot/bootarm.efi and not in a distro
> > specific path, e.g. /EFI/debian/grubarm.efi? /EFI/boot is typically only
> > used by installers.
> >
> > If the boot manager is started by distroboot it may not have an
> > appropriate device path. It tries to load the file given by environment
> > variable $fdtfile from the boot device.
> >
> >  From the U-Boot console could you, please, try:
> >
> > 1)
> > load usb 0:1 $kernel_addr_r EFI/boot/bootarm.efi
> > bootefi bootmgr
> >
> >
> > 2)
> > load usb 0:1 $kernel_addr_r EFI/boot/bootarm.efi
> > load usb 0:2 $fdt_addr_r dtb
> > bootefi bootmgr $fdt_addr_r
> >
> > where you need to replace dtb by the correct device tree file and adjust
> > the partition numbers.
> >
> > Best regards
> >
> > Heinrich
>
> To catch the earlier EFI API calls you can add
>
> #define DEBUG 1
>
> to lib/efi_loader/efi_boottime.c


Welcome to GRUB!

    EFI: Entry efi_locate_handle_ext(2,
9042a9de-23dc-4a38-96fb-7aded080516a, 00000000, 9df40dfc, 9ce2d660)
    EFI: Exit: efi_locate_handle_ext: 14
    EFI: Entry efi_open_protocol(9df5f298,
5b1b31a1-9562-11d2-8e3f-00a0c969723b, 9df40e14, 9df5f298, 00000000,
0x2)
    EFI: Exit: efi_open_protocol: 0
    EFI: Entry efi_open_protocol(00000000,
09576e91-6d3f-11d2-8e39-00a0c969723b, 9df40e14, 9df5f298, 00000000,
0x2)
    EFI: Exit: efi_open_protocol: 2
data abort
pc : [<9ce076d0>]          lr : [<9ffa85b3>]
reloc pc : [<7d69d6d0>]    lr : [<8083e5b3>]
sp : 9df40e28  ip : 00000000     fp : 00000003
r10: 9ffe2df8  r9 : 00000000     r8 : 9df5f298
r7 : 00000000  r6 : 9ce59a08     r5 : 9ce531f8  r4 : 9ce28040
r3 : 00000000  r2 : 9ffeb328     r1 : 00000000  r0 : 00000000
Flags: NzCv  IRQs off  FIQs on  Mode SVC_32
Code: e3500000 0a000015 e590000c eb00f96e (e5d03000)
UEFI image [0x9ce42000:0x9cf24fff] '/efi\boot\bootarm.efi'
Resetting CPU ...


>
> Best regards
>
> Heinrich
>
>


-- 
With best regards,
Matwey V. Kornilov

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