[PATCH] powerpc: Fix ppc32 initrd

OK, the Fedora ppc32 and ppc64 kernels should both be arch/powerpc by
tomorrow. They're booting on G5, POWER5, and my powerbook. I'll test
pmac SMP and Pegasos later -- but pmac smp is known broken in arch/ppc
anyway, and I'll live with a potential Pegasos regression for now; it
wasn't supported officially in FC4 either.

I needed to fix ppc32 initrd -- we were never setting initrd_start.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

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
 
 /**