On Wed, 2006-11-22 at 09:46 -0600, Kumar Gala wrote:

On Nov 22, 2006, at 9:20 AM, Jake Moilanen wrote:

quoted

When booting a Power6 in compat mode, the DFP bit must be set in the
client architecture call, or else firmware will downgrade the  
compliance
to P5 compat mode, thus removing VMX and DFP instructions.

Signed-off-by: Jake Moilanen <redacted>

--- 2.6/arch/powerpc/kernel/prom_init.c~	2006-11-13 15:01:13.000000000
-0600
+++ 2.6/arch/powerpc/kernel/prom_init.c	2006-11-21 18:38:27.000000000
-0600

@@ -627,6 +627,7 @@ static void __init early_cmdline_parse(v
 /* Option vector 3: processor options supported */
 #define OV3_FP			0x80	/* floating point */
 #define OV3_VMX			0x40	/* VMX/Altivec */
+#define OV3_DFP			0x20	/* decimal floating point */

Can we make the flag OV3_DECFP to distinguish it from Double FP.

Yup...

Signed-off-by: Jake Moilanen <redacted>

--- 2.6/arch/powerpc/kernel/prom_init.c~	2006-11-13 15:01:13.000000000
-0600
+++ 2.6/arch/powerpc/kernel/prom_init.c	2006-11-21 18:38:27.000000000
-0600

@@ -627,6 +627,7 @@ static void __init early_cmdline_parse(v
 /* Option vector 3: processor options supported */
 #define OV3_FP			0x80	/* floating point */
 #define OV3_VMX			0x40	/* VMX/Altivec */
+#define OV3_DECFP			0x20	/* decimal floating point */
 
 /* Option vector 5: PAPR/OF options supported */
 #define OV5_LPAR		0x80	/* logical partitioning supported */

@@ -674,7 +675,7 @@ static unsigned char ibm_architecture_ve
 	/* option vector 3: processor options supported */
 	3 - 2,				/* length */
 	0,				/* don't ignore, don't halt */
-	OV3_FP | OV3_VMX,
+	OV3_FP | OV3_VMX | OV3_DECFP,
 
 	/* option vector 4: IBM PAPR implementation */
 	2 - 2,				/* length */