[PATCH] powerpc: Fix machine detection in prom_init.c

In e8222502ee6157e2713da9e0792c21f4ad458d50 the detection of machine types
in prom_init broke for some machines. We should be checking /device_type
instead of /model. This should make Power3 and Power4 boot again. Haven't
been able to test this.  We also need to relocate before comparing.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 2 insertions, 3 deletions

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index d66c5e77fcff..7e4d54821a07 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -1528,12 +1528,11 @@ static int __init prom_find_machine_type(void)
          *    non-IBM designs !
          *  - it has /rtas
          */
-        len = prom_getprop(_prom->root, "model",
+        len = prom_getprop(_prom->root, "device_type",
                            compat, sizeof(compat)-1);
         if (len <= 0)
                 return PLATFORM_GENERIC;
-        compat[len] = 0;
-        if (strcmp(compat, "chrp"))
+        if (strncmp(compat, RELOC("chrp"), 4))
                 return PLATFORM_GENERIC;
 
         /* Default to pSeries. We need to know if we are running LPAR */