[PATCH] powerpc: Fix cell blade detection

The IBM Cell blade firmware might confuse the kernel to think it's a
pSeries machine. This fixes it for now. With a bit of luck, the firmware
will be updated to avoid that in the future but currently that patch is
needed.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index 5f79f01c44f2..3ba87835757e 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -389,6 +389,7 @@ static int __init pSeries_probe_hypertas(unsigned long node,
 
 static int __init pSeries_probe(void)
 {
+        unsigned long root = of_get_flat_dt_root();
         char *dtype = of_get_flat_dt_prop(of_get_flat_dt_root(),
                                           "device_type", NULL);
         if (dtype == NULL)
@@ -396,6 +397,13 @@ static int __init pSeries_probe(void)
         if (strcmp(dtype, "chrp"))
                 return 0;
 
+        /* Cell blades firmware claims to be chrp while it's not. Until this
+         * is fixed, we need to avoid those here.
+         */
+        if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
+            of_flat_dt_is_compatible(root, "IBM,CBEA"))
+                return 0;
+
         DBG("pSeries detected, looking for LPAR capability...\n");
 
         /* Now try to figure out if we are running on LPAR */