[U-Boot] [PATCH 1/2] imx: kconfig: introduce IMX_FIXED_IVT_OFFSET

[Stefano Babic]

Hi Peng,

On 29/06/2016 13:49, Peng Fan wrote:
> Introduce IMX_FIXED_IVT_OFFSET, which means different boot medias
> use the same IVT offset. To i.MX7, different boot medias' IVT
> offset is fixed at 0x400. So select IMX_FIXED_IVT_OFFSET for i.MX7D.
> 

It is nice that this discrepancy in the IVT offset is getting rid with
new SOCs. Very good idea by Hardware Designs.

However, I do not think it is a great to add a CONFIG_ switch. Reason is
that mkimage is a tool, and it can be maybe compiled once and used with
several SOCs without rebuilding. If you are using inside a Yocto-build,
there is not problem, else...

That means that some diversities should be managed at runtime by mkimage
itself, without rebuilding. We have two possibilities for that:

- adding some parameters tro mkimage. Well, this remains often
undocumented and the parameter can conflict with other image types. I
mention this, but I do not like.

- add this kind of flag to the imximage.cfg file.


There is already a BOOT_OFFSET attribute, see for example
board/freescale/vf610twr/imximage.cfg:

#include <asm/imx-common/imximage.cfg>

/* image version */
IMAGE_VERSION	2

/* Boot Offset 0x400, valid for both SD and NAND boot */
BOOT_OFFSET	FLASH_OFFSET_STANDARD

asm/imx-common/imximage.cfg contains i.MX6 offsets, but nevertheless,
can we used the same way for i.MX7, too ?

> Signed-off-by: Peng Fan <peng.fan at nxp.com>
> Cc: Stefano Babic <sbabic at denx.de>
> ---
>  arch/arm/cpu/armv7/mx7/Kconfig | 1 +
>  arch/arm/imx-common/Kconfig    | 7 +++++++
>  2 files changed, 8 insertions(+)
> 
> diff --git a/arch/arm/cpu/armv7/mx7/Kconfig b/arch/arm/cpu/armv7/mx7/Kconfig
> index ecfa4a2..6e70394 100644
> --- a/arch/arm/cpu/armv7/mx7/Kconfig
> +++ b/arch/arm/cpu/armv7/mx7/Kconfig
> @@ -7,6 +7,7 @@ config MX7
>  
>  config MX7D
>  	select ROM_UNIFIED_SECTIONS
> +	select IMX_FIXED_IVT_OFFSET
>  	bool
>  
>  choice
> diff --git a/arch/arm/imx-common/Kconfig b/arch/arm/imx-common/Kconfig
> index 1b7da5a..b248ef3 100644
> --- a/arch/arm/imx-common/Kconfig
> +++ b/arch/arm/imx-common/Kconfig
> @@ -4,6 +4,13 @@ config IMX_CONFIG
>  config ROM_UNIFIED_SECTIONS
>  	bool
>  
> +config IMX_FIXED_IVT_OFFSET
> +	bool "The IVT offset for different medias fixed or not"
> +	help
> +	  The IVT offset for different boot medias are fixed or not.
> +	  To i.MX7, the IVT offset for different boot medias are
> +	  fixed.
> +
>  config IMX_RDC
>  	bool "i.MX Resource domain controller driver"
>  	depends on ARCH_MX6 || ARCH_MX7
> 

Best regards,
Stefano Babic

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