From: Josh Boyer <jwboyer@linux.vnet.ibm.com>
To: linuxppc-dev@ozlabs.org
Subject: [PATCH] [POWERPC] 4xx: Use virtual PVR value to init FPU on arch/ppc 440EP
Date: Fri, 16 Nov 2007 11:29:56 -0600 [thread overview]
Message-ID: <20071116112956.0f1ca5b1@weaponx> (raw)
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@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));
+#else
spec = identify_cpu(offset, mfspr(SPRN_PVR));
+#endif
do_feature_fixups(spec->cpu_features,
PTRRELOC(&__start___ftr_fixup),
PTRRELOC(&__stop___ftr_fixup));
next reply other threads:[~2007-11-16 17:30 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-16 17:29 Josh Boyer [this message]
2007-11-16 19:20 ` [PATCH] [POWERPC] 4xx: Use virtual PVR value to init FPU on arch/ppc 440EP Kumar Gala
2007-11-16 19:23 ` Josh Boyer
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