--- linux-2.6.31.10/arch/mips/metarouter/prom.c	1970-01-01 03:00:00.000000000 +0300
+++ linux-2.6.31.10.new/arch/mips/metarouter/prom.c	2010-04-12 15:54:46.000000000 +0300
@@ -0,0 +1,66 @@
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/console.h>
+#include <asm/bootinfo.h>
+#include <linux/bootmem.h>
+#include <linux/ioport.h>
+#include <linux/ctype.h>
+#include <linux/irq.h>
+
+extern char arcs_cmdline[COMMAND_LINE_SIZE];
+
+extern unsigned long totalram_pages;
+extern unsigned long mips_hpt_frequency;
+
+void __init prom_init(void)
+{
+	int argc = fw_arg0;
+	char **argv = (char **) fw_arg1;
+	unsigned i;
+	unsigned offset = strlen(arcs_cmdline);
+	if (offset > 0)
+		offset += snprintf(arcs_cmdline + offset,
+				   sizeof(arcs_cmdline) - offset,
+				   " ");
+
+	/* HZ must be parsed here because otherwise it's too late */
+	for (i = 0; (i < argc && argv[i] != NULL); i++) {
+		if (strncmp(argv[i], "HZ=", 3) == 0) {
+			mips_hpt_frequency = 
+			    simple_strtoul(argv[i] + 3, 0, 10);
+			continue;
+		}
+		offset += snprintf(arcs_cmdline + offset,
+				   sizeof(arcs_cmdline) - offset,
+				   "%s ", argv[i]);
+	}
+}
+
+void __init prom_free_prom_memory(void)
+{
+	unsigned long addr, end;
+	extern char _text;
+
+	/*
+	 * Free everything below the kernel itself but leave
+	 * the first page reserved for the exception handlers.
+	 */
+
+	end = __pa(&_text);
+	addr = PAGE_SIZE;
+
+	while (addr < end) {
+		ClearPageReserved(virt_to_page(__va(addr)));
+		init_page_count(virt_to_page(__va(addr)));
+		free_page((unsigned long)__va(addr));
+		addr += PAGE_SIZE;
+		++totalram_pages;
+	}
+}
+
+unsigned long long sched_clock(void)
+{
+	return read_c0_count() * 1000000000 / mips_hpt_frequency;
+}