[U-Boot] [v2 PATCH 3/3] arm: mxs: Add 'Wait for JTAG user' if booted in JTAG mode

[Graeme Russ <gruss@tss-engineering.com>]

On 24/01/15 14:32, Graeme Russ wrote:
> When booting in JTAG mode, there is no way to use soft break-points, and
> no way of knowing when SPL has finished executing (so the user can issue
> a 'halt' command to load u-boot.bin for example)
>
> Add a debug output and simple loop to stop execution at the completion of
> the SPL initialisation as a pseudo break-point when booting in JTAG mode
>
> Signed-off-by: Graeme Russ <gruss@tss-engineering.com>
> ---
>
> Changes in v2
>   - Added and used boot mode #defines
>
> ---
>   arch/arm/cpu/arm926ejs/mxs/spl_boot.c     |  6 ++++++
>   arch/arm/include/asm/arch-mxs/sys_proto.h | 17 +++++++++++++++++
>   2 files changed, 23 insertions(+)
>
> diff --git a/arch/arm/cpu/arm926ejs/mxs/spl_boot.c b/arch/arm/cpu/arm926ejs/mxs/spl_boot.c
> index 2a5f817..d1457e0 100644
> --- a/arch/arm/cpu/arm926ejs/mxs/spl_boot.c
> +++ b/arch/arm/cpu/arm926ejs/mxs/spl_boot.c
> @@ -157,6 +157,12 @@ void mxs_common_spl_init(const uint32_t arg, const uint32_t *resptr,
>   	data->boot_mode_idx = bootmode;
>
>   	mxs_power_wait_pswitch();
> +
> +

My bad - I missed this. I'll post a v3

> +	if (mxs_boot_modes[data->boot_mode_idx].boot_pads == MXS_BM_JTAG) {
> +		debug("SPL: Waiting for JTAG user\n");
> +		asm volatile ("x: b x");
> +	}
>   }

Regards,


Graeme