diff options
Diffstat (limited to 'packages/linux/linux-omap2-git/beagleboard/l2-cache-check.patch')
| -rw-r--r-- | packages/linux/linux-omap2-git/beagleboard/l2-cache-check.patch | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/packages/linux/linux-omap2-git/beagleboard/l2-cache-check.patch b/packages/linux/linux-omap2-git/beagleboard/l2-cache-check.patch new file mode 100644 index 0000000000..d81f03880c --- /dev/null +++ b/packages/linux/linux-omap2-git/beagleboard/l2-cache-check.patch @@ -0,0 +1,45 @@ +Content-Type: text/plain; charset=ISO-8859-1; format=flowed +Content-Transfer-Encoding: 7bit + + +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@gmail.com> + +---- + +Changes in v2: Fix a typo. + +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 +267,26 @@ 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"); ++ } ++ ++ return 0; ++} ++ ++arch_initcall(omap3_check_l2cache); ++#endif /* CONFIG_ARCH_OMAP3 */ + |