Re: Possible fix for DEC 2000 / Jensen

Hello,

First of all thanks for committing the patch and there is still hope that
the Jensen will ever run NetBSD :)
I have tried to boot the latest snapshot, but it still hangs  at the same
point.
Full log attached.

[   1.0000000] vga0 at isa0 port 0x3b0-0x3df iomem 0xa0000-0xbffff
[   1.0000000] wsdisplay0 at vga0 (kbdmux ignored)
[   1.0000000] fdc0 at isa0 port 0x3f0-0x3f7 irq 6 drq 2

As always I am ready to test anything as it is sitting below my desk.

Thanks,

--
istvan

On Sat, Sep 19, 2020 at 9:22 PM Izumi Tsutsui <[email protected]>
wrote:

> Nigel Johnson wrote on port-alpha@:
>
> > I have a DEC2000 AXP model 300 that I would love to get NetBSD on, but
> > right now
> > it comes up with a bad memory SIMM.
>
> Off topic, but this reminds me an old todo item.
>
> In NetBSD 4.0 days, DEC2000 / Jensen support was still incomplete
> and it hung right after interrupts were enabled:
>  https://mail-index.netbsd.org/netbsd-bugs/2007/07/22/0001.html
>  https://gnats.netbsd.org/36628
>
> Recently Miod Vallat told me that he found a Jensen's quirk
> in a Linux source and suggested a possible fix for NetBSD/alpha.
>
> I was so lazy to call for testers for the suggested change,
> but finally I've committed it (Jensen has never worked anyway):
>
> https://mail-index.netbsd.org/source-changes/2020/09/19/msg122103.html
> ---
>
> Modified Files:
>         src/sys/arch/alpha/jensenio: com_jensenio.c
>
> Log Message:
> Possible fix for hangup on Jensen mentioned in PR/36628.
>
> According to comments in Linux drivers/tty/serial/8250/8250.h,
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/tty/serial/8250/8250.h?h=v5.8#n242
> the driver has to set OUT1 and OUT2 lines for "some ALPHA"
> otherwise "the machine locks up with endless interrupts."
> Note OUT2 (MCR_IENABLE) is set in MI com_attach_subr()
> so we have to set OUT1 (MCR_DSR) in the MD attachment.
>
> The information was notified from Miod Vallat.
> ---
>
> If anyone still has a working Jensen, it's much appreciated to test
> a current daily snapshot kernel (or 9.0 with the above change)
> on it.
>
> Thanks,
>
> ---
> Izumi Tsutsui
>