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fdt: Add support for the CONFIG_CMDLINE_EXTEND option

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This commit is contained in:
Phil Elwell
2014-12-05 17:26:26 +00:00
committed by popcornmix
parent 802ce94f95
commit fb571c963a
1 changed files with 24 additions and 5 deletions
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29
drivers/of/fdt.c
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@@ -915,19 +915,38 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
/* Retrieve command line */
p = of_get_flat_dt_prop(node, "bootargs", &l);
if (p != NULL && l > 0)
strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
/*
* CONFIG_CMDLINE is meant to be a default in case nothing else
* managed to set the command line, unless CONFIG_CMDLINE_FORCE
* is set in which case we override whatever was found earlier.
*
* However, it can be useful to be able to treat the default as
* a starting point to be extended using CONFIG_CMDLINE_EXTEND.
*/
((char *)data)[0] = '\0';
#ifdef CONFIG_CMDLINE
#ifndef CONFIG_CMDLINE_FORCE
if (!((char *)data)[0])
#endif
strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
if (p != NULL && l > 0) {
#if defined(CONFIG_CMDLINE_EXTEND)
int len = strlen(data);
if (len > 0) {
strlcat(data, " ", COMMAND_LINE_SIZE);
len++;
}
strlcpy((char *)data + len, p, min((int)l, COMMAND_LINE_SIZE - len));
#elif defined(CONFIG_CMDLINE_FORCE)
pr_warning("Ignoring bootargs property (using the default kernel command line)\n");
#else
/* Neither extend nor force - just override */
strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
#endif
}
#else /* CONFIG_CMDLINE */
if (p != NULL && l > 0) {
strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
#endif /* CONFIG_CMDLINE */
pr_debug("Command line is: %s\n", (char*)data);