L2 cache via L2X0 cache controller available on some ARM boards can provide a performance boost in some situations but decrease performance in others. This adds a kernel cmdline to disable L2X0 for the Laguna product family.
Signed-off-by: Tim Harvey <[email protected]> --- .../patches-3.3/480-laguna_l2cache_cmdline.patch | 29 ++++++++++++++++++++ 1 files changed, 29 insertions(+), 0 deletions(-) create mode 100644 target/linux/cns3xxx/patches-3.3/480-laguna_l2cache_cmdline.patch Re-worked patch upon request to not require an OpenWrt kernel config but instead add a kernel cmdline option to allow disabling of l2x0 for Laguna diff --git a/target/linux/cns3xxx/patches-3.3/480-laguna_l2cache_cmdline.patch b/target/linux/cns3xxx/patches-3.3/480-laguna_l2cache_cmdline.patch new file mode 100644 index 0000000..c8d9b9d --- /dev/null +++ b/target/linux/cns3xxx/patches-3.3/480-laguna_l2cache_cmdline.patch @@ -0,0 +1,29 @@ +--- a/arch/arm/mach-cns3xxx/laguna.c ++++ b/arch/arm/mach-cns3xxx/laguna.c +@@ -104,6 +104,16 @@ struct laguna_board_info { + + static struct laguna_board_info laguna_info __initdata; + ++static int l2x0_enable = 1; ++ ++static int __init l2x0_disable(char *s) ++{ ++ l2x0_enable = 0; ++ return 1; ++} ++__setup ("nol2x0", l2x0_disable); ++ ++ + /* + * NOR Flash + */ +@@ -693,7 +703,8 @@ static struct gpio laguna_gpio_gw2380[] + */ + static void __init laguna_init(void) + { +- cns3xxx_l2x0_init(); ++ if (l2x0_enable) ++ cns3xxx_l2x0_init(); + + platform_device_register(&laguna_watchdog); + -- 1.7.5.4 _______________________________________________ openwrt-devel mailing list [email protected] https://lists.openwrt.org/mailman/listinfo/openwrt-devel
