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[POWERPC] Add kernel parameter to set l3cr for MPC745x

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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).

Signed-off-by: Robert Brose <bob@qbjnet.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Robert Brose 2008-03-29 07:20:23 +11:00 • committed by Paul Mackerras
parent b163a256da
commit a78bfbfcfa
2 changed files with 14 additions and 0 deletions
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2
Documentation/kernel-parameters.txt
View file

@ -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.

12
arch/powerpc/kernel/setup_32.c
View file

@ -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 */