Re: Does grub-mkrescue support UEFI hybrid USB/DVD images?

[Vladimir 'φ-coder/phcoder' Serbinenko]

On 23.01.2015 10:40, Andrei Borzenkov wrote:
> On Fri, Jan 23, 2015 at 1:15 AM, Vladimir 'φ-coder/phcoder' Serbinenko
> <address@hidden> wrote:
>> On 22.01.2015 22:25, Kris Moore wrote:
>>>
>>> Hey all,
>>>
>>> We are trying to create hybrid USB/DVD images, and they work just fine
>>> on BIOS. However it doesn't seem to work when creating UEFI.
>>>
>> Try this:
>> diff --git a/grub-core/disk/efi/efidisk.c b/grub-core/disk/efi/efidisk.c
>> index 3b12c34..983afdb 100644
>> --- a/grub-core/disk/efi/efidisk.c
>> +++ b/grub-core/disk/efi/efidisk.c
>> @@ -862,9 +862,7 @@ grub_efidisk_get_device_name (grub_efi_handle_t *handle)
>>           if (! ctx.partition_name)
>>             {
>>               grub_disk_close (parent);
>> -             if (is_cdrom)
>> -               return grub_strdup (device_name);
>> -             return 0;
>> +             return grub_strdup (device_name);
> 
> How is it possible? So we have EFI device path that refers to
> partition (or at least to something that does not start on device
> first block) but grub does not see this partition? In case of CD-ROM
> this happens because CD-ROM media subtype actually refers to ESP and
> so points inside CD-ROM. But how it can happen for hard disk?
> 
I think his EFI uses eltorito even from the stick. In that case we end
up in exactly the same scenario as CD-ROM.
> Kris, could you add output of device path (grub_efi_print_device_path)
> at the beginning?
> 
> 
>>             }
>>
>>           dev_name = grub_xasprintf ("%s,%s", parent->name,
>>
>>
>>
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> 
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