I found this on the internet,
The UEFI adaptation of ElTorito results in mapping image offset 14800-A27FF
as a FAT file system, and executing file EFI/BOOT/BOOTX64.efi in the 64-bit
UEFI environment.
(link: http://www.seabios.org/pipermail/seabios/2012-June/003937.html)
So here are the steps, if I understand correctly:
- create a new instance of BLOCK_IO using the offsets above
- ConnectController() on the BLOCK_IO handle (which creates a new
SIMPLE_FILE_SYSTEM)
- get device path for newly created SIMPLE_FILE_SYSTEM
- append device path with EFI/BOOT/BOOTX64.efi
- LoadImage using appended device path
- StartImage
Is that right?
Regarding the RAM disk driver, I couldn't find much about it. Do you think
I'd have to have a custom installer with a ram disk driver included to make
this work? I'm guessing the Windows installer doesn't have one?
Thanks for taking the time to help me out, btw.
Thomas Rognon
On Thu, Apr 4, 2013 at 4:27 PM, Andrew Fish <af...@apple.com> wrote:
> So remember El Torito != ISO-9660, so the image will look different in the
> OS vs. the EFI. The file system that EFI sees will show up as a file in the
> OS, and EFI will not see all the ISO-9660 files you can see in the OS.
>
> Also remember that the OS Installer is going to call ExitBootServices() at
> some point, and after that it needs a native Windows driver for the RAM
> disk, as all the EFI device driver stuff goes away.
>
> Thanks,
>
> Andrew Fish
>
>
> On Apr 4, 2013, at 2:08 PM, Thomas Rognon <tcrog...@gmail.com> wrote:
>
> Oh ok, that's good news regarding El Torito. I'll start wrapping my head
> around the code you mentioned. The ISOs I will be booting are OS
> installers. Specifically, I'm trying to boot a legit Windows 7 installer
> from memory right now.
>
>
> On Thu, Apr 4, 2013 at 3:41 PM, Tim Lewis <tim.le...@insyde.com> wrote:
>
>> The partition driver already exists (see
>> MdeModulePkg/Universal/Disk/PartitionDxe). This already recognizes El
>> Torito format, so, as long as the partition you boot from is FAT32 you
>> should have no trouble (see the FatBinPkg). ****
>>
>> ** **
>>
>> If you are trying to boot an OS, then you have to figure out how to
>> convince how to convince that OS to continue to use that driver once it
>> reaches the hand-off point in boot, because it then requires a native OS
>> driver to continue to access your ISO.****
>>
>> ** **
>>
>> Tim****
>>
>> ** **
>>
>> *From:* Thomas Rognon [mailto:tcrog...@gmail.com]
>> *Sent:* Thursday, April 04, 2013 1:31 PM
>> *To:* edk2-devel@lists.sourceforge.net
>> *Subject:* Re: [edk2] Boot to ISO image in volatile memory****
>>
>> ** **
>>
>> Thanks! That gives me a great start. I'm new to a lot of this stuff,
>> though, so the steps you outlined will be tough for me without guidance.
>> Is there any UEFI optical drive code floating around the internet
>> somewhere? I looked but couldn't find any. I'm essential doing the same
>> thing as booting to a CD/DVD, except its all in memory.****
>>
>> ** **
>>
>> Thomas Rognon****
>>
>> ** **
>>
>> On Thu, Apr 4, 2013 at 2:27 PM, Tim Lewis <tim.le...@insyde.com> wrote:**
>> **
>>
>> Produce an instance of BLOCK_IO protocol which returns pieces of the
>> in-memory image. Then perform a ConnectController() on that handle, which
>> should cause a DISK_IO and SIMPLE_FILE_SYSTEM to be mounted automatically.
>> ****
>>
>> ****
>>
>> Then, you use the file system to load the boot loader (LoadImage()),
>> signal the ready-to-boot event, set up the UEFI watchdog timer, and then
>> start the boot loader (StartImage()). There may be a few more standard boot
>> items I may be forgetting, but that’s about it.****
>>
>> ****
>>
>> Tim****
>>
>> ****
>>
>> *From:* Thomas Rognon [mailto:tcrog...@gmail.com]
>> *Sent:* Thursday, April 04, 2013 12:21 PM
>> *To:* edk2-devel@lists.sourceforge.net
>> *Subject:* [edk2] Boot to ISO image in volatile memory****
>>
>> ****
>>
>> Let's say I'm running a UEFI_APPLICATION called IsoBootTest.efi and I
>> have an ISO image in volatile memory and I have the start address and size
>> of the ISO image. Can I boot the ISO image? If so, can someone give me a
>> hint on how I would do it? (If it makes any difference, I'm using UDK2010.)
>> ****
>>
>> ****
>>
>> Thomas Rognon****
>>
>>
>>
>> ------------------------------------------------------------------------------
>> Minimize network downtime and maximize team effectiveness.
>> Reduce network management and security costs.Learn how to hire
>> the most talented Cisco Certified professionals. Visit the
>> Employer Resources Portal
>> http://www.cisco.com/web/learning/employer_resources/index.html
>> _______________________________________________
>> edk2-devel mailing list
>> edk2-devel@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/edk2-devel****
>>
>> ** **
>>
>>
>> ------------------------------------------------------------------------------
>> Minimize network downtime and maximize team effectiveness.
>> Reduce network management and security costs.Learn how to hire
>> the most talented Cisco Certified professionals. Visit the
>> Employer Resources Portal
>> http://www.cisco.com/web/learning/employer_resources/index.html
>> _______________________________________________
>> edk2-devel mailing list
>> edk2-devel@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/edk2-devel
>>
>>
>
> ------------------------------------------------------------------------------
> Minimize network downtime and maximize team effectiveness.
> Reduce network management and security costs.Learn how to hire
> the most talented Cisco Certified professionals. Visit the
> Employer Resources Portal
>
> http://www.cisco.com/web/learning/employer_resources/index.html_______________________________________________
> edk2-devel mailing list
> edk2-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/edk2-devel
>
>
>
>
> ------------------------------------------------------------------------------
> Minimize network downtime and maximize team effectiveness.
> Reduce network management and security costs.Learn how to hire
> the most talented Cisco Certified professionals. Visit the
> Employer Resources Portal
> http://www.cisco.com/web/learning/employer_resources/index.html
> _______________________________________________
> edk2-devel mailing list
> edk2-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/edk2-devel
>
>
------------------------------------------------------------------------------
Minimize network downtime and maximize team effectiveness.
Reduce network management and security costs.Learn how to hire
the most talented Cisco Certified professionals. Visit the
Employer Resources Portal
http://www.cisco.com/web/learning/employer_resources/index.html
_______________________________________________
edk2-devel mailing list
edk2-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/edk2-devel
