2014년 08월 15일 05:34, Andrew Morton 쓴 글:
On Thu, 14 Aug 2014 19:13:36 +0900 kpark3...@gmail.com wrote:
From: Sahara <keun-o.p...@windriver.com>
Although there are many obs_kernel_param and its names are
earlyprintk and also EARLY_PRINTK is also enabled, we could not
see the early_printk output properly until now. This patch
considers earlycon as well as earlyprintk.
Sorry, I just don't understand this description.
What does the patch actually do? What was the kernel behaviour without
the patch and what is the kernel behaviour with the patch?
Without this patch,
- earlycon case -
if early_param("earlycon", ...) is defined and
case #1: if cmdline has "earlycon", then it satisfies the condition
"(p->early && parameq(param, p->str))". You can see early_printk().
case #2: if cmdline has "console", then it satisfies the condition
"strcmp(param, "console") == 0 && strcmp(p->str, "earlycon") == 0". You
can see early_printk().
- earlyprintk case -
if early_param("earlyprintk", ...) is defined and
case #1: if cmdline has "earlyprintk", then it satisfies the condition
"(p->early && parameq(param, p->str))". You can see early_printk().
case #2: if cmdline has "console", it does not satisfies the condition,
because it only checks out "earlycon" only.
This patch fixes the case #2 problem of earlyprintk.
Thanks.
Best Regards,
Sahara.
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