Re: About support for rtVAX300

[Holm Tiffe <holm%freibergnet.de@localhost>]

Holm Tiffe wrote:

> Johnny Billquist wrote:
> 
> > A few questions below, as I have a hard time following what you actually 
> > have done...
> > 
> > On 2013-01-12 23:53, Holm Tiffe wrote:
> > >[..]
> > >
> > >I'm no on that point, weher I should be able to talk with the UART.
> > >
> > >The machine boots int my (incomplete) scncnprobe().
> > >
> > >void
> > >scncnprobe(struct consdev *cn)
> > >{
> > >
> > >//static  vaddr_t dz_regs;
> > >
> > >         extern vaddr_t iospace;
> > >         vaddr_t * du_base;
> > >         int diagcons;
> > >         paddr_t ioaddr = 0x20100000;
> > >         extern const struct cdevsw scn_cdevsw;
> > >
> > >         switch(vax_boardtype) {
> > >         case VAX_BTYP_RT300:
> > >                 diagcons = 0;
> > >                 break;
> > >         default:
> > >                 cn->cn_pri = CN_DEAD;
> > >                 return;
> > >         }
> > >         if (diagcons)
> > >                 cn->cn_pri = CN_REMOTE;
> > >         else
> > >                 cn->cn_pri = CN_NORMAL;
> > >         cn->cn_dev = makedev(cdevsw_lookup_major(&scn_cdevsw), diagcons);
> > >         du_base = (void *)iospace;
> > >         ioaccess(iospace, ioaddr, 1);
> > >         du_base[0xc]=0xa;
> > >         DELAY(10000);
> > >         du_base[0xc]=(u_char)0x42;
> > >         DELAY(10000);
> > >         __asm("halt");
> > >
> > >}
> > >
> > >...and finally halts at bottom.
> > >I've used that dz_vsbus.c as example and this is the very first call
> > >to my driver.
> > >The UART in this moment should be still poper initialized from the ROM
> > >code, so writing to this Transmit buffer at 0x2010000c should print out
> > >the char 'B'.
> > 
> > I assume what you see is that it comes to the halt, but nothing is 
> > printed on the console, right?
> > 
> > Check your assignment to iospace in your code... :-)
> > (I hope you do understand what you are doing...)
> [..]
> > 
> > Yes, be more careful and observant when you write your code. :-)
> > 
> >     Johnny
> 
Ok changing the declaration of du_base to volatile char * seems to make
that shit work:
myip: rtvax (192.168.50.20)
root addr=192.168.50.50 path=/data/home/exports/rtvax
2070940+92260=0x2105c0

BC
?06 HLT INST
    PC = 800F216E
>>> 
(added an 'C' in the code)

Regards,
Holm
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