Re: [PATCH] ARM: shmobile: defconfig: enable HDMI output for RCar

[Khiem Nguyen <khiem.nguyen.xt@rvc.renesas.com>]

On 10/14/2015 8:32 PM, Geert Uytterhoeven wrote:
> On Wed, Oct 14, 2015 at 3:18 PM, Khiem Nguyen
> <khiem.nguyen.xt@rvc.renesas.com> wrote:
>>>> AFAIK, in some recent versions of Gen2 BSP, all the devices (including
>>>> all devices enabled by u-boot for its processing, like Ethernet, TMU,
>>>> serial) will be turned off right before jumping to kernel start address.
>>>
>>> Would it make sense to keep the serial port enabled in order to support
>>> early
>>> printk ?
>>>
>>
>> I don't think early printk is supported in Gen2 BSP, which is base on LTSI
>> 3.10.
>> Geert has introduced early printk support for Gen2 in Nov 2014.
>>
>> Maybe, we need to consider this point for Gen3.
>
> INTC-RT, MFIS, INTC-SYS, IRQC, and SCIF0 are left enabled, according
> to the U-Boot sources.

Yes, you are right. Above devices were left enabled.
Especially, some interrupt controller devices need to keep ON to ensure 
system operation
while transferring to kernel boot.


> Gr{oetje,eeting}s,
>
>                          Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                  -- Linus Torvalds
>