On Sun, May 11, 2008 at 08:12:48AM +0200, Dirk Behme wrote:
>
> Enabling L2 cache of Cortex-A8 based OMAP3 has to be done by bootloader.
> Check if this is done and warn if not.
>
> Signed-off-by: Dirk Behme <dirk.behme@xxxxxxxxx>
Acked-by: Felipe Balbi <felipe.balbi@xxxxxxxxx>
>
> ----
>
> Changes in v3: Remove braces. Thanks to Felipe for review!
> Index: linux-beagle/arch/arm/mach-omap2/id.c
> ===================================================================
> --- linux-beagle.orig/arch/arm/mach-omap2/id.c
> +++ linux-beagle/arch/arm/mach-omap2/id.c
> @@ -267,3 +267,25 @@ void __init omap2_check_revision(void)
>
> }
>
> +#ifdef CONFIG_ARCH_OMAP3
> +/*
> + * OMAP3 has L2 cache which has to be enabled by bootloader.
> + */
> +static int __init omap3_check_l2cache(void)
> +{
> + u32 val;
> +
> + /* Get CP15 AUX register, bit 1 enabled indicates L2 cache is on */
> + asm volatile("mrc p15, 0, %0, c1, c0, 1":"=r" (val));
> +
> + if ((val & 0x2) == 0)
> + printk(KERN_WARNING "Warning: L2 cache not enabled. Check "
> + "your bootloader. L2 off results in performance loss\n");
> + else
> + pr_info("OMAP3 L2 cache enabled\n");
> +
> + return 0;
> +}
> +
> +arch_initcall(omap3_check_l2cache);
> +#endif /* CONFIG_ARCH_OMAP3 */
--
Best Regards,
Felipe Balbi
me@xxxxxxxxxxxxxxx
http://blog.felipebalbi.com
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