Re: More serial ports in EFI bootstrap?

On Tue, Jun 17, 2025 at 03:41:15PM +0100, Robert Swindells wrote:
> You could look at what is in sys/dev/ic/com.c to handle a serial
> console and add the equivalent to sys/dev/usb/ucom.c.
> 
> Start at the 'struct consdev comcons' declaration, that links to the
> functions needed.

I created a struct filled with functions that for now are no-ops, they
just return.
static struct consdev comcons = {
        .cn_probe = ucomcnprobe,
        .cn_init = ucomcninit,
        .cn_getc = ucomcngetc,
        .cn_putc = ucomcnputc,
        .cn_pollc = ucomcnpollc,
        .cn_bell = ucomcnbell,
        .cn_halt = ucomcnhalt,
        .cn_flush = ucomcnflush,
        .cn_dev = NODEV,
        .cn_pri = CN_NORMAL
};

At the end of ucom_attach, I try this if everything went fine:
        comcons.cn_dev = makedev(66, 0);
        cn_tab = &comcons;

That is enough to crash during the boot, and since there is no
console, there is no clue about what went wrong. Any idea?


-- 
Emmanuel Dreyfus
[email protected]