NetBSD with A1200/A4000 IDE emulation

[mark_k]

Originally Posted by strim

No, that's not normal or expected. But I never saw this on a real machine. Do you have ptyfs mounted on /dev/pts ? Not enough ptys error is weird.

I know basically nothing about NetBSD, so after installation completed all I did was reboot, log in as root and type startx. I didn't make any config changes at all. I wondered whether any initial configuration steps were needed before being able to start X. But as mentioned, the initial X background and mouse pointer do appear for a while before X quits.

If you want to investigate the problem, install WinUAE in Wine and replace winuae.exe with the 2.6.0b1 version. Download the pre-installed hardfile I mentioned before (http://www..com/archive/UhZ_t...nstall_ze.html). Run WinUAE, load my NetBSD_install_A4000.uae config and adjust it for the location you unpacked the hardfile to.

I can also upload an A3000 config installed NetBSD hardfile if that would be better for you. You can't use the installed-on-A4000 hardfile with an A3000 or vice versa since NetBSD complains about device names; rsd0a vs rwd0a.

[Toni Wilen]

Originally Posted by mark_k

In that mode the right part of the display (the last 8 character columns, so about 64 pixels) is blanked. And there's a large blank part to the left of the text. Does that happen on a real Amiga?

Left border matches copper list, for some reason left horizontal start position (both DDFSTRT and DIWSTRT) values are very small.

Actually DDFSTRT is too small ($14) which may trigger some undocumented hardware behavior (It did with OCS but it was fixed in ECS)

[mark_k]

Originally Posted by strim

It should work on ECS, but I think that the person who added support for these modes had only access to AGA machine. That's something I should look into (one day...).

I was forgetting about the ECS chip RAM bandwidth. Assuming the NetBSD display uses two bitplanes (and not one plane + a sprite for cursor)... a 2-plane superhighres display will cause the same slowdown as a 4-plane high-res screen on ECS machines.

[Toni Wilen]

Shifted display is solved, I missed one important piece in BEAMCON0 register documentation, programmed modes automatically disable normal hard DMA start/stop positions. (But because this is quite special mode, display will need manual shifting to center it properly)

It was not noticed earlier because AOS monitor drivers can't use earlier horizontal DMA start, it would disable mouse cursor sprite

[mark_k]

I installed NetBSD 1.3.3 on A3000/030 config, and with today's winuae.exe was actually able to start X in A2024 mode.

The installed HDF (which I'll upload tomorrow) also booted okay on A4000/030.

Edit: See this thread for the HDF link and instructions.