[U-Boot] [PATCH] arm: pxa: config option for PXA270 turbo mode

Marek Vasut
2013-05-21T10:35:44Z

Dear Sergey Yanovich,

> PXA270 CPU has turbo mode. The mode is 2.5 times faster than the
> default run mode. Activating the mode early significantly speeds
> up boot process.
>
> Signed-off-by: Sergey Yanovich <ynvich@gmail.com>

What's the difference? Where does this macro get used ?

> ---
> arch/arm/cpu/pxa/pxa2xx.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/cpu/pxa/pxa2xx.c b/arch/arm/cpu/pxa/pxa2xx.c
> index 09e8177..6c918ac 100644
> --- a/arch/arm/cpu/pxa/pxa2xx.c
> +++ b/arch/arm/cpu/pxa/pxa2xx.c
> @@ -32,6 +32,10 @@
> #include <common.h>
> #include <asm/arch/pxa-regs.h>
>
> +#ifndef CONFIG_SYS_CLKCFG
> +#define CONFIG_SYS_CLKCFG 0x00000002
> +#endif
> +
> /* Flush I/D-cache */
> static void cache_flush(void)
> {
> @@ -244,7 +248,8 @@ void pxa_clock_setup(void)
> {
> writel(CONFIG_SYS_CKEN, CKEN);
> writel(CONFIG_SYS_CCCR, CCCR);
> - asm volatile("mcr p14, 0, %0, c6, c0, 0" : : "r"(2));
> + asm volatile("mcr p14, 0, %0, c6, c0, 0" : :
> + "r"(CONFIG_SYS_CLKCFG));
>
> /* enable the 32Khz oscillator for RTC and PowerManager */
> writel(OSCC_OON, OSCC);

Best regards,
Marek Vasut