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Adding large disk support to INT13h (Users)

posted by boeckmann, Aachen, Germany, 04.04.2024, 23:09

> EDD back as far as version 1.1 (I have a copy of the spec) supports 64-bit
> LBA. If yours isn't doing that, it doesn't _really_ support EDD.
>

This is NOT about LBA access. LBA access is working perfectly fine. And I did not claim otherwise. The problem is that the BIOS detects the disk as 8.4GB, and there is nothing I can do about it. Even INT13,48h returns the disk size as 8.4GB, while querying the ATA interface directly yields the correct sector count.

> If you end up writing your own, you'll need to do it at the
> hardware-specific level (PATA, SATA, etc.). While that's possible to do,
> it defeats the purpose of having a BIOS.
I will not write my own. I merely try to replace parts of it with XTIDE BIOS functions.

> The "standard" setup for disks larger than 8.4 GB is to set CHS to the
> maximum 8.4 GB (CHS = 1024-256-63). That is supposed to work as a "flag"
> that tells the rest of the world (including the BIOS) that the disk is
> actually larger than 8.4 GB. Does that not work for you?
No.

Bret, I thank you for your input, but I think we are talking past each other. So I suggest we stop discussing it at this point.

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