On Mon, May 04, 2015 at 10:01:37AM -0400, Peter Hurley wrote:
> Hi Robert,
>
> On 05/03/2015 05:10 PM, Robert Schwebel wrote:
> > Hi Peter,
> >
> > with 4.1-rc1, my boxes with early console enabled show something like
> > this (the example is vexpress, but it for example also happens on an
> > AM335x board):
> >
> > earlycon: no match for ttyAMA0,38400n8
>
> This shouldn't impact any previous earlycon setup. Are you saying
> you're seeing a regression?
>
> How do you have early console enabled, via the command line or via DT?
What happens here is that Robert has console=ttyAMA0,38400n8 in his
command line. In init/main.c we have:
static int __init do_early_param(char *param, char *val, const char *unused)
{
const struct obs_kernel_param *p;
for (p = __setup_start; p < __setup_end; p++) {
if ((p->early && parameq(param, p->str)) ||
(strcmp(param, "console") == 0 &&
strcmp(p->str, "earlycon") == 0)
) {
if (p->setup_func(val) != 0)
pr_warn("Malformed early option '%s'\n", param);
}
}
/* We accept everything at this stage. */
return 0;
}
This means that param_setup_earlycon() gets called with the arguments
passed to the console= parameter which makes no sense in this context
and leads to the "no match for" message.
Sascha
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