Can not use ATA PIO mode in Qemu

[shore]

Hi I'm following a book to write a kernel but meet problem with disk driver part of program.

My system is:

Manjaro: 18.1.5
Linux kernel: 5.5.2-1
Qemu: 4.2.0-1

I start Qemu by:

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qemu-system-x86_64 -machine q35 -cpu Broadwell -accel kvm -m 1G Boot.disk

I use ATA PIO mode to access disk. However, when trying to read port 0x1F1 to detect errors, it returns 255. While in Bochs or VirtualBox, it is 0. Also interrupts are not able to react.

But, keyboard and mouse are driver works fine. And when in int 13h also works.

So I'm kind of don't know what to do, and seeking for help in here.

Hope someone can help me on this. Thanks!

[Octocontrabass]

-machine q35

The q35 machine does not include an IDE controller. Use the default "pc" machine, or write an AHCI driver.

[iProgramInCpp]

I use this argument:

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 -drive file=%path%\build\harddrive.raw,index=0,if=ide,format=raw

[Klakap]

Or try easiest

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-hda harddisc.img