[U-Boot] [PATCH V2] imx: Define common routines to set cpu and board environment variables

[Eric Nelson]

Thanks Marek,

On 11/14/2013 02:22 PM, Marek Vasut wrote:
> Dear Eric Nelson,
>
> +Albert, Tom
>
>> These can be used in bootcmd to produce DTB file names.
>>
>> set_board_env() allows over-ride for use when a developing custom
>> DTB files.
>>
>> Signed-off-by: Eric Nelson <eric.nelson at boundarydevices.com>
>> ---
>> V2 adds void to the function declarations and definitions and adds
>> a blank to keep checkpatch clean.
>>
>> I'm feeling like I missed something here. Routines in imx-common/cpu.c
>> are shared between various i.MX processors, but there doesn't appear
>> to be a common header file.
>>
>> It seems that arch/arm/include/asm/imx-common.h should be present
>> but isn't. Am I missing something?
>>
>> I also think there should be a way we could pull this into multiple
>> boards without adding a full-up board_late_init() function into
>> each board file, but tracing the init sequence, I'm not seeing an
>> architecture-specific spot after env_init.
>>
>>   arch/arm/imx-common/cpu.c                 | 15 +++++++++++++--
>>   arch/arm/include/asm/arch-mx6/sys_proto.h |  9 +++++++++
>>   2 files changed, 22 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/arm/imx-common/cpu.c b/arch/arm/imx-common/cpu.c
>> index 0cd2538..4214946 100644
>> --- a/arch/arm/imx-common/cpu.c
>> +++ b/arch/arm/imx-common/cpu.c
>> @@ -99,8 +99,6 @@ unsigned imx_ddr_size(void)
>>   }
>>   #endif
>>
>> -#if defined(CONFIG_DISPLAY_CPUINFO)
>> -
>>   const char *get_imx_type(u32 imxtype)
>>   {
>>   	switch (imxtype) {
>> @@ -121,6 +119,19 @@ const char *get_imx_type(u32 imxtype)
>>   	}
>>   }
>>
>> +void __weak set_cpu_env(void)
>> +{
>> +	setenv("cpu", get_imx_type(cpu_type(get_cpu_rev())));
>> +}
>
> I'd say we should have a U-Boot wide thing here + CPU-specific overrides where
> applicable.
>

I'll follow your lead on this.

I'm just hoping to get a trivial amount of machinery so a boot
script can figure out which of a set of DTBs to load:

	imx6q-nitrogen6x.dtb,
	imx6dl-nitrogen6x.dtb, or
	imx6s-nitrogen6x.dtb

Fabio's recent patch for SABRE SD showed the same need.

This could be even easier on i.MX6 if we had more formalized (and
lower-case) strings returned by get_imx_type(), but I wanted this
to be very small.

I'm not sure how consistent the DTB naming is for other machines
or if there's always the equivalent of get_imx_type().

Regards,


Eric