English Amiga Board - View Single Post - Correct way to hard reset in the bootblock on 1.3-3.1?

Photon · 14 September 2021, 20:23

Ahem. Sorry again.

The HRM section about resetting actually doesn't say anything about jmp (a0) having to be aligned. It aligns the Supervisor() target address. Must all code invoked by supervisor state be 4-aligned? SuperState() on 2.0+ doesn't.

Also if things can be patched and monitored maybe it's best to do as much as possible with hardware code. TRAP into supervisor instead of using Exec etc. If we're turning off ints anyway, I mean...

14 September 2021, 20:23	#34
Photon Moderator Join Date: Nov 2004 Location: Eksjö / Sweden Posts: 5,647	Ahem. Sorry again. The HRM section about resetting actually doesn't say anything about jmp (a0) having to be aligned. It aligns the Supervisor() target address. Must all code invoked by supervisor state be 4-aligned? SuperState() on 2.0+ doesn't. Also if things can be patched and monitored maybe it's best to do as much as possible with hardware code. TRAP into supervisor instead of using Exec etc. If we're turning off ints anyway, I mean...