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-rw-r--r--arch/powerpc/kernel/setup-common.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index d43fa8c0e5ac..e22856ecb5a0 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -405,6 +405,46 @@ static int __init set_preferred_console(void)
console_initcall(set_preferred_console);
#endif /* CONFIG_PPC_MULTIPLATFORM */
+void __init check_for_initrd(void)
+{
+#ifdef CONFIG_BLK_DEV_INITRD
+ unsigned long *prop;
+
+ DBG(" -> check_for_initrd()\n");
+
+ if (of_chosen) {
+ prop = (unsigned long *)get_property(of_chosen,
+ "linux,initrd-start", NULL);
+ if (prop != NULL) {
+ initrd_start = (unsigned long)__va(*prop);
+ prop = (unsigned long *)get_property(of_chosen,
+ "linux,initrd-end", NULL);
+ if (prop != NULL) {
+ initrd_end = (unsigned long)__va(*prop);
+ initrd_below_start_ok = 1;
+ } else
+ initrd_start = 0;
+ }
+ }
+
+ /* If we were passed an initrd, set the ROOT_DEV properly if the values
+ * look sensible. If not, clear initrd reference.
+ */
+ if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
+ initrd_end > initrd_start)
+ ROOT_DEV = Root_RAM0;
+ else {
+ printk("Bogus initrd %08lx %08lx\n", initrd_start, initrd_end);
+ initrd_start = initrd_end = 0;
+ }
+
+ if (initrd_start)
+ printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
+
+ DBG(" <- check_for_initrd()\n");
+#endif /* CONFIG_BLK_DEV_INITRD */
+}
+
#ifdef CONFIG_SMP
/**