diff options
Diffstat (limited to 'arch/arm/mach-imx/platsmp.c')
| -rw-r--r-- | arch/arm/mach-imx/platsmp.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/platsmp.c b/arch/arm/mach-imx/platsmp.c index 4a69305db65e..c6e1ab544882 100644 --- a/arch/arm/mach-imx/platsmp.c +++ b/arch/arm/mach-imx/platsmp.c @@ -12,6 +12,7 @@ #include <linux/init.h> #include <linux/smp.h> +#include <asm/cacheflush.h> #include <asm/page.h> #include <asm/smp_scu.h> #include <asm/mach/map.h> @@ -21,6 +22,7 @@ #define SCU_STANDBY_ENABLE (1 << 5) +u32 g_diag_reg; static void __iomem *scu_base; static struct map_desc scu_io_desc __initdata = { @@ -80,6 +82,18 @@ void imx_smp_prepare(void) static void __init imx_smp_prepare_cpus(unsigned int max_cpus) { imx_smp_prepare(); + + /* + * The diagnostic register holds the errata bits. Mostly bootloader + * does not bring up secondary cores, so that when errata bits are set + * in bootloader, they are set only for boot cpu. But on a SMP + * configuration, it should be equally done on every single core. + * Read the register from boot cpu here, and will replicate it into + * secondary cores when booting them. + */ + asm("mrc p15, 0, %0, c15, c0, 1" : "=r" (g_diag_reg) : : "cc"); + __cpuc_flush_dcache_area(&g_diag_reg, sizeof(g_diag_reg)); + outer_clean_range(__pa(&g_diag_reg), __pa(&g_diag_reg + 1)); } struct smp_operations imx_smp_ops __initdata = { |