Trouble detecting drive for ATA_PIO.

[Caffeine]

Hi, I am having trouble detecting the hard disk for my ATA_PIO driver. After sending the interrupt command, the status port comes back as 0? Does this mean I should write a PIC driver to find out where the ATA_PIO ports are? Or is their another soulution?

[iansjack]

What do you mean by “sending the interrupt command”? Do you have an online repository of your code?

[Caffeine]

What do you mean by “sending the interrupt command”? Do you have an online repository of your code?

That was i typo, my bad. I meant the IDENTIFY command.

[Klakap]

Without code, it is almost impossible to guess where problem is.

Does this mean I should write a PIC driver to find out where the ATA_PIO ports are?

I assume you mean PCI. If you want serious driver, answer is yes. Hard disk is not everywhere connected to same ports.

[Caffeine]

Without code, it is almost impossible to guess where problem is.

Does this mean I should write a PIC driver to find out where the ATA_PIO ports are?

I assume you mean PCI. If you want serious driver, answer is yes. Hard disk is not everywhere connected to same ports.

I did mean PCI, again, sorry for the typos. Thanks for the help! I'll make a PCI driver.

[Octocontrabass]

It sounds an awful lot like you do have an IDE controller at the legacy I/O addresses, but there's no hard drive attached.

Are you testing this in a virtual machine? If so, how did you configure said virtual machine?

[iansjack]

You must know whether there is an IDE drive in your computer (real or virtual). So, is there? If so then there is something wrong in your code (which we can’t see, so can’t guess at your error).

Forget PCI; if you have an IDE drive it will show up at the standard ports.

[Caffeine]

It sounds an awful lot like you do have an IDE controller at the legacy I/O addresses, but there's no hard drive attached.

Are you testing this in a virtual machine? If so, how did you configure said virtual machine?

Yeah, I'm using qemu. Here is the command I am using:

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qemu-system-i386 -cdrom Binaries/OS.iso -s

.

But other than that I am using the default settings.

EDIT:
I just replaced the line with:

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qemu-system-i386 -drive file=Binaries/caffieneOS.iso,media=cdrom

and now it is detecting something! But it does not look like it supports ATA.

[Octocontrabass]

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qemu-system-i386 -cdrom Binaries/OS.iso -s

This attaches a CD drive to the secondary IDE channel. You're probably looking at the primary IDE channel, but this command doesn't attach anything to the primary IDE channel.

I just replaced the line with:

Code: Select all

qemu-system-i386 -drive file=Binaries/caffieneOS.iso,media=cdrom

, and now it is detecting something!

This attaches a CD drive to the primary IDE channel.

[Caffeine]

So now the drive does not seem to be ATA. My code to check if it is ATA is:

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    while (status & STAT_BSY) { status = inportb(ATA_PRIMARY_COMM_REGSTAT); }  // Wait for status bit to clear

    unsigned char mid = inportb(ATA_PRIMARY_LBA_MID);
    unsigned char hi = inportb(ATA_PRIMARY_LBA_HI);
    if (mid != 0 || hi != 0) { print("The drive is not ATA."); return 0; }

And i've defined ATA_PRIMARY_LBA_MID as 0x1F4 and ATA_PRIMARY_LBA_HI 0x1F5. I'm pretty sure this is right but if not please let me know. And if I did do it correctly, how do I make the drive ATA. Also, STAT_BSY is defined as (1 << 7).

[iansjack]

That’s correct. A CD drive is not ATA. Try attaching a hard disk.

[Caffeine]

That’s correct. A CD drive is not ATA. Try attaching a hard disk.

I got it working by running the VM with this command:

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qemu-system-i386 -drive file=Binaries/caffieneOS.iso,media=disk,format=raw

Thanks for all of your help!