[U-Boot] [PATCH] ARM: bootm: Allow booting in secure mode on hyp capable systems

[Siarhei Siamashka <siarhei.siamashka@gmail.com>]

On Wed, 15 Oct 2014 12:13:05 +0200
Hans de Goede <hdegoede@redhat.com> wrote:

> Older Linux kernels will not properly boot in hype mode, add support for a
> bootm_boot_mode environment variable, which when set to "sec" will cause
> u-boot to boot in secure mode even when build with non-sec (and hyp) support.
> 
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> ---
>  arch/arm/lib/bootm.c | 23 ++++++++++++++++++-----
>  1 file changed, 18 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c
> index 39fe7a1..037fc8d 100644
> --- a/arch/arm/lib/bootm.c
> +++ b/arch/arm/lib/bootm.c
> @@ -235,6 +235,18 @@ static void boot_prep_linux(bootm_headers_t *images)
>  	}
>  }
>  
> +#if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT)
> +static bool boot_nonsec(void)
> +{
> +	char *s = getenv("bootm_boot_mode");
> +
> +	if (s && !strcmp(s, "sec"))
> +		return false;
> +
> +	return true;
> +}
> +#endif
> +
>  /* Subcommand: GO */
>  static void boot_jump_linux(bootm_headers_t *images, int flag)
>  {
> @@ -283,12 +295,13 @@ static void boot_jump_linux(bootm_headers_t *images, int flag)
>  
>  	if (!fake) {
>  #if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT)
> -		armv7_init_nonsec();
> -		secure_ram_addr(_do_nonsec_entry)(kernel_entry,
> -						  0, machid, r2);
> -#else
> -		kernel_entry(0, machid, r2);
> +		if (boot_nonsec()) {
> +			armv7_init_nonsec();
> +			secure_ram_addr(_do_nonsec_entry)(kernel_entry,
> +							  0, machid, r2);
> +		}
>  #endif
> +		kernel_entry(0, machid, r2);
>  	}
>  #endif
>  }

BTW, I'm currently achieving the same result, but without the need to do
extra environment configuration gymnastics for the end users:
    https://github.com/ssvb/u-boot-sunxi-dram/commit/e914abe551e712a59a8fc1ac9a4b8490e8e7c866

-- 
Best regards,
Siarhei Siamashka