UEFI firmware workstation and badly written (by me) el-torito images

Hi all

First of all, I am aware of that option UEFI in VMware workstation cannot be supported. If you can't answer that, it's okay.

-Very well, background. I am a developer working for a backup software company and one of my main tasks at present is in charge the UEFI boot for all our rescue media. To cut a long story short, our application using imapi2 API to write an ISO image that we can then burn to a disc; Alternatively, you can just use the ISO.


It turns out that if you try to set the product using this API id, strange things happen. Specifically, when you create the entry of UEFI, you get:

Section header entry:

The heading indicator: 0 x 91 (final Section header entry)

PlatformId: 0xef (EFI)

Section of the entries: 1

"" ID ":

Section of boot catalog entry:

Entry is bootable

Bootable media emulation type: 1.44 MB floppy Emulation

Loading the media address: 0 (0x0000)

System type: 0 (0x00)

Areas of responsibility: 2880 (0x0b40)

Support LBA: 352 (0 x 00000160)

(the/path/to/iso-i dumpet results).

The problem here is that the entrance to the EFI is set to the emulation of 1.44 MB. It is of my (Finally, the API)-said the fault and the UEFI specification it must be set to "no emulation".

This dubious ISO does not start when fed real hardware, as the firmware there fortunately sulk technical violation and goes out to find a real volume EFI to start. However, I have noticed workstation is a little more tolerant. I can start such a dubious iso!

So my question is, workstation is simply ignore the emulation field? Or if boot failure? I actually wonder if this was the intended behavior, or if I misinterpreted the spec - this is not a critical issue.

Thank you

Antony

Hi Antony again,

There is a robust statement a little more on this subject to the beginning of article 2: "UEFI support starting from the media that contain an OS UEFI charger or a UEFI System Partition defined. A defined UEFI System Partition is required by the UEFI to start from a block device. "(Probably all other media non-bloc to which she refers, containing an OS loader but no System Partition, use EFI_LOAD_FILE_PROTOCOL.)  Only a single statement is not reinforced elsewhere in the specification, throughout many places that the issue would be considered relevant.

Unfortunately, there is rather a list of already released OS for which the installation media provides the EFI bootloader in a partition described by an entry "emulation" without any input of non-emulation 0xEF... at least Fedora 11 and 12, SuSE Linux Enterprise Desktop and Server 10 and 11, openSuSE 11 and Asianux 3.

Then... the closest I can come to a conclusion on the issue is to say that starting from an entry "emulation" maybe not the intention of the authors of the [U] EFI specification, as you seem to have also concluded... However it seems to me be advised to support for reasons of compatibility, and it seems within reason for a software provider to implement this support.

See you soon,.

--

Darius

Tags: VMware

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