Re: cbfsdisk not found

[Andrei Borzenkov]

On Fri, Mar 17, 2017 at 4:24 PM, Gailu Singh <address@hidden> wrote:
> @Vladimir
> I do not have serial console (board has memory mapped uart not support in
> grub) to capture memory details. Also on graphics console I can not give
> commands from usb keyboard to  dump memory because USB port on board are 3.0
> and USB 3.0 is not supported in Grub. Any other thing I could try?
>
> @Andrei
> What is the expected address supposed to be printed for successful
> identification of CBFS.
>

GRUB reads 4 bytes at offset 0xffffffc0. All ones likely means that
this address simply is not valid.

According to 
https://github.com/mrnuke/coreboot/blob/master/documentation/cbfs.txt,
"A pointer to the location of the header will be located at offset -4
from the end of the ROM. This translates to address 0xFFFFFFFC on a
normal x86 system." Any chance ROM is mapped somewhere else in your
case?

> I am building coreboot image myself and stitching with other intel firmware
> as documented by Intel.
>
> On Fri, Mar 17, 2017 at 12:45 PM, Vladimir 'phcoder' Serbinenko
> <address@hidden> wrote:
>>
>>
>>
>> On Thu, Mar 16, 2017, 22:30 Gailu Singh <address@hidden> wrote:
>>>
>>> Please find coreboot image attached. Zipped it to reduce size
>>
>> This image is actually fine and is read correctly by fstest. Apparently
>> for some reason reading image at the end of 4GiB doesn't work. Can you try
>> dumping last 8M before 4G mark from /dev/mem ?
>>>
>>>
>>> On Fri, Mar 17, 2017 at 1:19 AM, Vladimir 'phcoder' Serbinenko
>>> <address@hidden> wrote:
>>>>
>>>>
>>>>
>>>> On Thu, Mar 16, 2017, 12:43 Gailu Singh <address@hidden> wrote:
>>>>>
>>>>> >>Try insmod cbfs
>>>>>
>>>>>
>>>>> Trieed, it does not help. BTW cbfs is already included in my grub elf
>>>>> image so I don't think I need to do insmod.
>>>>>
>>>>> ./grub-mkstandalone --grub-mkimage=./grub-mkimage -O i386-coreboot -o
>>>>> default_payload.elf --modules='ls ahci pata ehci uhci ohci usb_keyboard
>>>>> usbms part_msdos ext2 fat at_keyboard part_gpt usbserial_usbdebug cbfs'
>>>>> --install-modules='linux search configfile normal cbtime cbls memrw iorw
>>>>> minicmd lsmmap lspci halt reboot hexdump pcidump regexp setpci lsacpi 
>>>>> chain
>>>>> test serial multiboot cbmemc linux16 gzio echo help syslinuxcfg xnu affs 
>>>>> afs
>>>>> bfs btrfs cbfs cpio cpio_be exfat ext2 fat hfs hfsplus iso9660 jfs minix
>>>>> minix2 minix2_be minix3 minix3_be minix_be newc nilfs2 ntfs odc procfs
>>>>> reiserfs romfs sfs squash4 tar udf ufs1 ufs1_be ufs2 xfs zfs 
>>>>> password_pbkdf2
>>>>> ' --fonts= --themes= --locales= -d grub-core/
>>>>> /boot/grub/grub.cfg=./coreboot.cfg
>>>>>
>>>>> This must be something else. AFAIK memdisk itself resides in CBFS,
>>>>> Strangely ls comman shows memdisk but not cbfsdisk
>>>>
>>>> Please share your coreboot image.
>>>>>
>>>>>
>>>>>
>>>>> On Fri, Mar 17, 2017 at 12:52 AM, Vladimir 'phcoder' Serbinenko
>>>>> <address@hidden> wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Thu, Mar 16, 2017, 12:18 Gailu Singh <address@hidden> wrote:
>>>>>>>
>>>>>>> Hi Experts,
>>>>>>>
>>>>>>> I am using grub2 with coreboot and configured with
>>>>>>> --with-platform=coreboot.
>>>>>>>
>>>>>>> I am able to load grub2 from coreboot. However when I run ls command,
>>>>>>> I do not see cbfsdisk. ls only shows
>>>>>>>
>>>>>>> (memdisk) (ahci0) (ahci0,msdos1) (ahci0,msdos2)
>>>>>>>
>>>>>>> I have added file in the cbfs as follows and need to access it but
>>>>>>> when I try (cbfsdisk)/myfile I get error disk 'cbfsdisk' not found.
>>>>>>>
>>>>>>> build/util/cbfstool/cbfstool build/coreboot.rom add -f myfile -n
>>>>>>> myfile -t raw
>>>>>>>
>>>>>>> Any idea how to access myfile on cbfsdisk?
>>>>>>
>>>>>> Try insmod cbfs
>>>>>>>
>>>>>>>
>>>>>>> Thanks.
>>>>>>> _______________________________________________
>>>>>>> Grub-devel mailing list
>>>>>>> address@hidden
>>>>>>> https://lists.gnu.org/mailman/listinfo/grub-devel
>>>>>>
>>>>>>
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>>>>>
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