[PATCH] [POWERPC] 4xx: Use virtual PVR value to init FPU on arch/ppc 440EP

Josh Boyer jwboyer at linux.vnet.ibm.com
Sat Nov 17 04:29:56 EST 2007

This fixes arch/ppc 440EP platforms to setup the FPU correctly.  A virtual
PVR is used, as 440GR platforms share an identical hardware PVR value and do
not have an FPU.

Signed-off-by: Josh Boyer <jwboyer at linux.vnet.ibm.com>
Index: linux-2.6/arch/ppc/kernel/setup.c
--- linux-2.6.orig/arch/ppc/kernel/setup.c
+++ linux-2.6/arch/ppc/kernel/setup.c
@@ -312,7 +312,14 @@ early_init(int r3, int r4, int r5)
 	 * Identify the CPU type and fix up code sections
 	 * that depend on which cpu we have.
+#if defined(CONFIG_440EP) && defined(CONFIG_PPC_FPU)
+	/* We pass the virtual PVR here for 440EP as 440EP and 440GR have
+	 * identical PVRs and there is no reliable way to check for the FPU
+	 */
+	spec = identify_cpu(offset, (mfspr(SPRN_PVR) | 0x8));
 	spec = identify_cpu(offset, mfspr(SPRN_PVR));

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