Hi Michael,
On Mon, May 20, 2024 at 11:01 PM Michael Schmitz <schmitzmic@xxxxxxxxx> wrote:
On 21/05/24 05:17, Paolo Pisati wrote:
On Sun, May 19, 2024 at 04:58:17PM +0200, Geert Uytterhoeven wrote:
Probably some of the Warp 1260 on-board hardware has its interrupt line
asserted, causing an interrupt storm when Linux enables interrupts.
Amiboot knows how to reset several boards to prevent this, but it
doesn't support Warp 1260 yet.
https://github.com/geertu/m68kboot/blob/master/common/amiga/linuxboot.c#L195
Doesn't the kernel print out something like "too many spurious interrupts etcetc" in
this case?
Used to do that, yes. But I haven't found that message in current mainline.
Anyhow, any debug option i could turn on? I've tried everything IRQ related, but
CONFIG_CONSOLE_LOGLEVEL_DEFAULT should be high enough to print messages
of level WARN:
asmlinkage void handle_badint(struct pt_regs *regs)
{
atomic_inc(&irq_err_count);
pr_warn("unexpected interrupt from %u\n", regs->vector);
}
That would help to verify Geert's reading of the problem (which I have
no doubt is the correct one).
The interrupt vector number will tell us what interrupt level is causing
the storm (if it's an autovector int).
If it's _not_ an autovector int?
Anyway, unlike Atari, Amiga only uses autovector interrupts, and most
expansion boards use IRQ_AMIGA_PORTS (IRQ_AUTO_2) (some can be jumpered
for IRQ_AMIGA_EXTER (IRQ_AUTO_6). As lots of other components use
IRQ_AUTO_2, these are all shared interrupts. Hence handle_badint()
is never called, the "bad" interrupt is never disabled by the irq core
code, and you end up with an eternal interrupt storm.
that didn't change a bit. I understand it requires a new fw from the board
manufacturer or a quirk in the bootloader, but i would like to get something more
verbose before i ping them.
Interrupt level and vector number would help the manufacturer to give us
the information required to disable the problematic interrupt source.
IRQ_AMIGA_PORTS :-)
I guess the system would boot if you hack arch/m68k/amiga/amiints.c
to never enable IRQ_AMIGA_PORTS in amiga_custom.intena, but then you
would also lose the ability to use e.g. the builtin A1200 IDE.
BTW, code to reset/silence the hardware components on Warp 1260
could not only be added to Amiboot, but also to e.g.
arch/m68k/amiga/config.c:amiga_parse_bootinfo().
Reverse-engineering the AmigaOS interrupt handlers for the board may
also help.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
