[linux-sunxi] Re: [PATCH 4/4] simplefb: add clock handling code

[Geert Uytterhoeven]

On Thu, Oct 2, 2014 at 2:22 PM, jonsmirl at gmail.com <jonsmirl at gmail.com> wrote:
> 1) temporary early boot console -- this is nothing but an address in
> RAM and the x/y layout. The character set from framebuffer is built
> into the kernel.  The parallel to this is early-printk and how it uses
> the UARTs without interrupts. This console vaporizes late in the boot
> process -- the same thing happens with the early printk UART driver.
> EARLYPRINTK on the command line enables this.

JFYI, the early serial console can also vanish, even very early in the boot
process, before the unused clocks are disabled.
Cfr. http://marc.info/?l=linux-sh&m=141227657322649&w=2

So there's no safety in this world without calling clk_prepare_enable().

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at 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