Re: About support for rtVAX300

[Anders Magnusson <ragge%ludd.ltu.se@localhost>]

On 01/12/2013 11:53 PM, 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");
>   
> }
The code above is correct. iospace is set to a hole in the virtual 
address space already, ioaccess() just maps ioaddr to that hole.

If it just ends with this halt (no machine checks) then there is 
something where you write, and the most likely error is that you are not 
writing correctly to the UART :-)

You can try from the console to get it output something maybe, like
>>> D/P/B 2010000C 42

or whatever syntax the UART has.

-- Ragge