OS/2, eCS & ArcaOS - Technical > Setup & Installation

Switch from CSM to UEFI

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Roderick Klein:

--- Quote from: Neil Waldhauer on October 29, 2024, 02:40:33 pm ---Perhaps it isn't that hard. I think you could do this experiment.

Install ArcaOS 5.1 on the system you have now.
Install the new graphics card and switch to UEFI
Install ArcaOS 5.1 on a different volume.
Compare the Config.sys. I think only a graphics has changed.
Make that change and copy the files it refers to to the first ArcaOS installation config.sys
See if the first installation now boots under UEFI

Make sure you have space to make the new boot volumes and also the EFI volume.

--- End quote ---

you also need an ESP partition.... Effectively UEFI boot no longer uses an MBR.
Airboot stops working to any dualboot options will have to be setup again.

Roderick

Martin Iturbide:
Hello Per.

I haven't used it myself, but Rich Walsh wrote a command line utility called CSM2UEFI.

You can check it out here: https://www.os2world.com/forum/index.php/topic,3423.msg41061.htmlv

Reegards

Rich Walsh:

--- Quote from: Roderick Klein on October 29, 2024, 01:44:02 pm ---converting the HDD to gpt disc layout is more complex yet again (if you want this). Could Arca Noae have developed this code ? Perhaps. But its pretty complex code.

--- End quote ---

Years ago I wrote an MBR-to-GPT converter that worked with any LVM-compliant disk and didn't require moving or copying the disk's contents. In fact, after conversion, you could use the disk as MBR _or_ GPT until you changed the partition layout. I offered it to AN but the person I dealt with couldn't imagine any use for it and declined the offer.

Per E. Johannessen:
Interesting. Could the MBR-to-GPT converter be used on a win10-disk/NTFS  as well?
(I have so far not assigned any drive letter/LVM info for that disk.)

Rich Walsh:

--- Quote from: Per E. Johannessen on October 30, 2024, 05:40:33 pm ---Could the MBR-to-GPT converter be used on a win10-disk/NTFS  as well?

--- End quote ---

This has nothing to do with the filesystem and little to do with the OS.

GPT uses the first 34 sectors  of the disk as well as the last 33 sectors for its headers and partition tables. These sectors are always unused on an LVM-compliant disk, allowing them to be used for GPT without overwriting anything else on the disk except for the MBR itself. An MBR disk that was created by Win probably has the initial sectors free (because it aligns partitions on a 4MB boundary), but the last sectors are likely included in an existing partition which would have to be resized.

Note 1: I overstated the converter's capabilities. Once converted to GPT, the disk cannot be used as an MBR disk without restoring the original MBR sector (which the converter saves so the change can be rolled back).

Note 2: My MBR-to-GPT converter is not freeware. If someone wishes to pay $2,500 USD, I will provide an unlimited-use license allowing them to resell individual copies, post it to hobbes as freeware, include in AOS, or whatever. I have no plans to issue individual-use licenses.

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