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Subject: [PATCH] powerpc: add kernel parameter to set l3cr for G4 cpu
To: linuxppc-dev@ozlabs.org
Date: Tue, 25 Mar 2008 12:45:49 -0500 (CDT)
Sender: bob@qbjnet.com
From: Robert Brose <linuxppcdev@lists.qbjnet.com>
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Old-world powermacs don't set L2CR or L3CR on processor upgrade cards.
This simple patch allows the setting of L3CR via a kernel parameter
(like the existing kernel parameter to set L2CR).

This is the first time I've posted a patch, please excuse me if I've
broken protocol in any way.

Signed-off-by: Robert Brose <bob@qbjnet.com>


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--- linux-2.6.24/arch/powerpc/kernel/setup_32.c.orig	2008-03-10 11:24:16.566354597 -0500
+++ linux-2.6.24/arch/powerpc/kernel/setup_32.c	2008-03-10 11:22:22.711626305 -0500
@@ -172,6 +172,18 @@ int __init ppc_setup_l2cr(char *str)
 }
 __setup("l2cr=", ppc_setup_l2cr);
 
+/* Checks "l3cr=xxxx" command-line option REB */
+int __init ppc_setup_l3cr(char *str)
+{
+	if (cpu_has_feature(CPU_FTR_L3CR)) {
+		unsigned long val = simple_strtoul(str, NULL, 0);
+		printk(KERN_INFO "l3cr set to %lx\n", val);
+		_set_L3CR(val);		/* and enable it */
+	}
+	return 1;
+}
+__setup("l3cr=", ppc_setup_l3cr);
+
 #ifdef CONFIG_GENERIC_NVRAM
 
 /* Generic nvram hooks used by drivers/char/gen_nvram.c */

--- linux-2.6.24/Documentation/kernel-parameters.txt.orig	2008-03-25 12:30:09.688082305 -0500
+++ linux-2.6.24/Documentation/kernel-parameters.txt	2008-03-25 12:30:29.816083202 -0500
@@ -877,6 +877,8 @@ and is between 256 and 4096 characters. 
 
 	l2cr=		[PPC]
 
+	l3cr=		[PPC]
+
 	lapic		[X86-32,APIC] Enable the local APIC even if BIOS
 			disabled it.
 

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