[U-Boot] [PATCH 07/15] sunxi_nand_spl: Turn off clocks when we're done with the nand

[Hans de Goede]

Hi,

On 08/19/2015 03:48 PM, Maxime Ripard wrote:
> On Sat, Aug 15, 2015 at 10:02:40PM +0200, Hans de Goede wrote:
>> Turn off the nand and dma clocks when we're done with the nand, this
>> puts the nand and dma controllers back into a clean state for when the
>> kernel boots.
>>
>> Without this the kernel will not boot properly when it is build with
>> dma-controller support.
>
> The kernel shouldn't behave like that. What issue are you seeing?

The kernel does not output anything, not even on the serial console,
so it seems to crash quite early on. I guess that the dma controller
has an irq asserted and that that fires as soon as the dma driver
unmasks it.

I did not investigate this further since u-boot really should put
the hardware in a clean state before booting the os, so we want this
change even if the kernel were fixed to deal with the unclean state.

Regards,

Hans