Eric Lee / linux-smarc-t335x-v3.2

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Commit a78bfbfcfaca64e6198f164c43a60afc8a50e2c6

Authored by Robert Brose
Committed by Paul Mackerras
1 parent b163a256da
Exists in master and in 4 other branches v3.2_AM335xPSP_04.06.00.11, v3.2_NEWT335xPSP_04.06.00.11, v3.2_SBC_SMARTMEN, v3.2_SMARCT335xPSP_04.06.00.11

[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 <bob@qbjnet.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

Showing 2 changed files with 14 additions and 0 deletions Side-by-side Diff

Documentation/kernel-parameters.txt
Diff comments   View file @ a78bfbf
... ... @@ -931,6 +931,8 @@
931 931  
932 932 l2cr= [PPC]
933 933  
  934 + l3cr= [PPC]
  935 +
934 936 lapic [X86-32,APIC] Enable the local APIC even if BIOS
935 937 disabled it.
936 938  
arch/powerpc/kernel/setup_32.c
Diff comments   View file @ a78bfbf
... ... @@ -172,6 +172,18 @@
172 172 }
173 173 __setup("l2cr=", ppc_setup_l2cr);
174 174  
  175 +/* Checks "l3cr=xxxx" command-line option */
  176 +int __init ppc_setup_l3cr(char *str)
  177 +{
  178 + if (cpu_has_feature(CPU_FTR_L3CR)) {
  179 + unsigned long val = simple_strtoul(str, NULL, 0);
  180 + printk(KERN_INFO "l3cr set to %lx\n", val);
  181 + _set_L3CR(val); /* and enable it */
  182 + }
  183 + return 1;
  184 +}
  185 +__setup("l3cr=", ppc_setup_l3cr);
  186 +
175 187 #ifdef CONFIG_GENERIC_NVRAM
176 188  
177 189 /* Generic nvram hooks used by drivers/char/gen_nvram.c */