Re: Grub 2 how boot .iso with memdisk?

[Дмитрий Чепуровский]

Ok, thank you for answer.
I've got two other questions now about grub:
1. I tried to do like in the syslinux tutorial for memdisk in grub2. I
wrote in grub console
linux16 /memdisk iso
initrd16 /iso/memtest86+-5.01.iso

But nothing happend. It doesn't write any error, it simply break line
and show inviting input into the console.

What i made wrong? How can I make it to working.

2. Have Grub2 got the same functional?

2015-11-02 16:09 GMT+03:00 Andrei Borzenkov <address@hidden>:
> On Mon, Nov 2, 2015 at 3:35 PM, Дмитрий Чепуровский <address@hidden> wrote:
>> Ok, I read that it could be done by using syslinux memdisk with grub.
>>
>> In this case, I found I need to call linux16 memdisk and initrd16 to launch 
>> iso.
>>
>> 1. Does it works?
>
> Why you ask us and not syslinux folks? It's their software after all -
> GRUB is just a messenger here :)
>
> http://www.syslinux.org/wiki/index.php/MEMDISK#GRUB2
>
>> 2. Where could I found syslinux memdisk?
>>
>
> The same site (surprise) also has Download link ...
>
>> 2015-11-02 15:25 GMT+03:00 Andrei Borzenkov <address@hidden>:
>>> On Mon, Nov 2, 2015 at 3:05 PM, Дмитрий Чепуровский <address@hidden> wrote:
>>>> I'm making usb multiusb pendrive.
>>>>
>>>> 1. I want to understand what is memdisk.mod, how could I use it.
>>>
>>> I already answered this.
>>>
>>>> 2. I want to boot iso (bootloader thart in iso file) from grub2
>>>>
>>>
>>> GRUB does not support parsing El Torito boot catalog and accessing
>>> boot image ... at least to my knowledge. So sorry, this is probably
>>> not possible right now.
>>>
>>> Besides the problem is not as much reading CD boot block as emulating
>>> "real" CD for the code that would be launched. I do not say it is not
>>> possible, but so far nobody implemented this in GRUB.
>>>
>>>> 2015-11-02 14:44 GMT+03:00 Andrei Borzenkov <address@hidden>:
>>>>> On Mon, Nov 2, 2015 at 2:25 PM, Дмитрий Чепуровский <address@hidden> 
>>>>> wrote:
>>>>>> I'm trying to boot iso file. I want to boot ubuntu 15.10 iso & Windows
>>>>>> 10 Install iso. I found in google, that it could be made in grub2
>>>>>> using memdisk.
>>>>>>
>>>>>
>>>>> You are confused. memdisk in grub2 is not used to boot anything. It is
>>>>> still not clear what you are trying to do:
>>>>>
>>>>> - you try to pretend that system was booted from CD or DVD with
>>>>> content of this image
>>>>>
>>>>> - or -
>>>>>
>>>>> - you try to boot using some file inside this image
>>>>>
>>>>>> For test I'm trying to boot with memtest ubuntu-15.10-desktop-amd64.iso.
>>>>>>
>>>>>> cfg test menuentery:
>>>>>> menuentry "Test1" {
>>>>>>     insmod memdisk
>>>>>>     initrd /iso/ubuntu-15.10-desktop-amd64.iso
>>>>>> }
>>>>>>
>>>>>> When I tied to run this I got alloc magic is broken at 0xc7ed5060: 
>>>>>> c7e5c980
>>>>>>
>>>>>
>>>>> This makes me believe you want to pretend you are booted from DVD ...
>>>>>
>>>>>> What I'm doing wrong. How can I do this?
>>>>>>
>>>>>
>>>>> It is still not quite clear what you want to do; could you explain in
>>>>> more words?