[U-Boot] [PATCH v2 06/10] ARM: add tegra20 support to arm720t

[Stephen Warren]

On 06/05/2012 03:20 PM, Allen Martin wrote:
> Add support for tegra20 arm7 boot processor.  This processor is used
> to power on the Cortex A9 and transfer control to it.

> diff --git a/arch/arm/cpu/arm720t/cpu.c b/arch/arm/cpu/arm720t/cpu.c

>  #elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR)
>  	/* No cleanup before linux for IntegratorAP/CM720T as yet */
> +#elif defined (CONFIG_MACH_TEGRA_GENERIC)
> +	/* No cleanup before linux for tegra as yet */
>  #else
>  #error No cleanup_before_linux() defined for this CPU type
>  #endif

Wouldn't CONFIG_TEGRA2 be a better define to use? Same comment throughout.

> diff --git a/arch/arm/cpu/arm720t/tegra20/cpu.c b/arch/arm/cpu/arm720t/tegra20/cpu.c

> +/* Returns 1 if the current CPU executing is a Cortex-A9, else 0 */
> +int ap20_cpu_is_cortexa9(void)
> +{
> +	u32 id = readb(NV_PA_PG_UP_BASE + PG_UP_TAG_0);
> +	return id == (PG_UP_TAG_0_PID_CPU & 0xff);
> +}

Doesn't the SPL always run on the AVP, and the regular U-Boot build
always run on the main CPUs - I'm not sure why this runtime API would be
needed.

> +void init_pllx(void)

I assume a lot of the code in this file is copied from the
armv7/tegra20/*.c files. Shouldn't this patch remove the ARMv7 versions
since presumably it's no longer needed - doesn't the non-SPL U-Boot rely
on the SPL U-Boot always having run first in order to start the main
U-Boot executing?

If not, then shouldn't this code be in tegra20-common so it can be shared?

> diff --git a/arch/arm/cpu/arm720t/tegra20/cpu.h b/arch/arm/cpu/arm720t/tegra20/cpu.h

Similarly, this file seems like it'd be in tegra20-common/include or
somewhere like that.