Re: Grub 2 how boot .iso with memdisk?

[Andrei Borzenkov]

On Mon, Nov 2, 2015 at 11:35 PM, Дмитрий Чепуровский <address@hidden> wrote:
> 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.
>

You need to execute "boot" command after that. GRUB does it implicitly
for menu entries; in CLI you need to do it yourself.

> 2. Have Grub2 got the same functional?
>

Since yesterday? No :)

> 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?