Re: [PATCH v3] ARM: OMAP3: Check for L2 cache enabled

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Linux Arm (vger)]     [ARM Kernel]     [ARM MSM]     [Linux Tegra]     [Linux WPAN Networking]     [Linux Wireless Networking]     [Maemo Users]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Trails]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux