From a78bfbfcfaca64e6198f164c43a60afc8a50e2c6 Mon Sep 17 00:00:00 2001 From: Robert Brose Date: Sat, 29 Mar 2008 07:20:23 +1100 Subject: [PATCH] [POWERPC] Add kernel parameter to set l3cr for MPC745x 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). Signed-off-by: Robert Brose Signed-off-by: Paul Mackerras --- Documentation/kernel-parameters.txt | 2 ++ arch/powerpc/kernel/setup_32.c | 12 ++++++++++++ 2 files changed, 14 insertions(+) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 508e2a2c9864..a1ff28e0872b 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -931,6 +931,8 @@ and is between 256 and 4096 characters. It is defined in the file l2cr= [PPC] + l3cr= [PPC] + lapic [X86-32,APIC] Enable the local APIC even if BIOS disabled it. diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c index cd870a823d18..eac936eb3190 100644 --- a/arch/powerpc/kernel/setup_32.c +++ b/arch/powerpc/kernel/setup_32.c @@ -172,6 +172,18 @@ int __init ppc_setup_l2cr(char *str) } __setup("l2cr=", ppc_setup_l2cr); +/* Checks "l3cr=xxxx" command-line option */ +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 */