Re: Possible fix for DEC 2000 / Jensen

[Istvan Gyenes <igyenes%gmail.com@localhost>]

Hi,

For me the easiest way to burn cdhdtape to a cd and boot as I do not
have NetBSD running around me.
So if it is possible and you can build it is perfect. 
If it is too much effort, I can set up a cross build env probably in
next week.

Thanks,

--
istvan


On Wed, 2020-09-23 at 01:03 +0900, Izumi Tsutsui wrote:
> Hi,
> 
> > 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.
> 
> Umm, bad news..
> 
> > 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.
> 
> I wonder when COM_REG_MCR is written on startup because
> cominit() doesn't refer sc->sc_mcr on writing COM_REG_MCR
> (because it's called from early cninit).
>  https://nxr.netbsd.org/xref/src/sys/dev/ic/com.c?r=1.359#2461
> 
> Could you try the following patch?
> (if you need a pre-build kernel please let me know)
> 
> Index: sys/arch/alpha/jensenio/com_jensenio.c
> ===================================================================
> RCS file: /cvsroot/src/sys/arch/alpha/jensenio/com_jensenio.c,v
> retrieving revision 1.16
> diff -u -p -d -r1.16 com_jensenio.c
> --- sys/arch/alpha/jensenio/com_jensenio.c	19 Sep 2020 16:54:34
> -0000	1.16
> +++ sys/arch/alpha/jensenio/com_jensenio.c	22 Sep 2020 15:56:05
> -0000
> @@ -93,6 +93,7 @@ com_jensenio_attach(device_t parent, dev
>  	struct com_jensenio_softc *jsc = device_private(self);
>  	struct com_softc *sc = &jsc->sc_com;
>  	struct jensenio_attach_args *ja = aux;
> +	struct com_regs *regsp = &sc->sc_regs;
>  	bus_space_handle_t ioh;
>  
>  	sc->sc_dev = self;
> @@ -102,7 +103,7 @@ com_jensenio_attach(device_t parent, dev
>  		aprint_error(": can't map i/o space\n");
>  		return;
>  	}
> -	com_init_regs(&sc->sc_regs, ja->ja_iot, ioh, ja->ja_ioaddr);
> +	com_init_regs(regsp, ja->ja_iot, ioh, ja->ja_ioaddr);
>  
>  	sc->sc_frequency = COM_FREQ;
>  
> @@ -110,11 +111,13 @@ com_jensenio_attach(device_t parent, dev
>  	 * According to comments in Linux
> drivers/tty/serial/8250/8250.h,
>  	 * 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.
> +	 * Note OUT2 (MCR_IENABLE) is also set in MI com_attach_subr()
> +	 * but we have to set them before interrupts are enabled.
>  	 * See also PR/36628.
>  	 */
> -	SET(sc->sc_mcr, MCR_DRS);
> +	SET(sc->sc_mcr, MCR_DRS | MCR_IENABLE);
> +	bus_space_write_1(regsp->cr_iot, regsp->cr_ioh,
> +	    regsp->cr_map[COM_REG_MCR], sc->sc_mcr);
>  
>  	com_attach_subr(sc);
>  
> 
> 
> Thanks,
> 
> ---
> Izumi Tsutsui