openwrt/target/linux/ar71xx/patches-3.6/506-MIPS-ath79-prom-parse-redboot-args.patch

--- a/arch/mips/ath79/prom.c
+++ b/arch/mips/ath79/prom.c
@@ -19,6 +19,8 @@
 
 #include "common.h"
 
+static char ath79_cmdline_buf[COMMAND_LINE_SIZE] __initdata;
+
 static inline int is_valid_ram_addr(void *addr)
 {
 	if (((u32) addr > KSEG0) &&
@@ -32,6 +34,41 @@ static inline int is_valid_ram_addr(void
 	return 0;
 }
 
+static void __init ath79_prom_append_cmdline(const char *name,
+					      const char *value)
+{
+	snprintf(ath79_cmdline_buf, sizeof(ath79_cmdline_buf),
+		 " %s=%s", name, value);
+	strlcat(arcs_cmdline, ath79_cmdline_buf, sizeof(arcs_cmdline));
+}
+
+static const char * __init ath79_prom_find_env(char **envp, const char *name)
+{
+	const char *ret = NULL;
+	int len;
+	char **p;
+
+	if (!is_valid_ram_addr(envp))
+		return NULL;
+
+	len = strlen(name);
+	for (p = envp; is_valid_ram_addr(*p); p++) {
+		if (strncmp(name, *p, len) == 0 && (*p)[len] == '=') {
+			ret = *p + len + 1;
+			break;
+		}
+
+		/* RedBoot env comes in pointer pairs - key, value */
+		if (strncmp(name, *p, len) == 0 && (*p)[len] == 0)
+			if (is_valid_ram_addr(*(++p))) {
+				ret = *p;
+				break;
+			}
+	}
+
+	return ret;
+}
+
 static __init void ath79_prom_init_cmdline(int argc, char **argv)
 {
 	int i;
@@ -48,7 +85,32 @@ static __init void ath79_prom_init_cmdli
 
 void __init prom_init(void)
 {
+	const char *env;
+	char **envp;
+
 	ath79_prom_init_cmdline(fw_arg0, (char **)fw_arg1);
+
+	envp = (char **)fw_arg2;
+	if (!strstr(arcs_cmdline, "ethaddr=")) {
+		env = ath79_prom_find_env(envp, "ethaddr");
+		if (env)
+			ath79_prom_append_cmdline("ethaddr", env);
+	}
+
+	if (!strstr(arcs_cmdline, "board=")) {
+		env = ath79_prom_find_env(envp, "board");
+		if (env) {
+			/* Workaround for buggy bootloaders */
+			if (strcmp(env, "RouterStation") == 0 ||
+			    strcmp(env, "Ubiquiti AR71xx-based board") == 0)
+				env = "UBNT-RS";
+
+			if (strcmp(env, "RouterStation PRO") == 0)
+				env = "UBNT-RSPRO";
+
+			ath79_prom_append_cmdline("board", env);
+		}
+	}
 }
 
 void __init prom_free_prom_memory(void)