[U-Boot] [linux-sunxi] Re: [RFC PATCH 1/4] sunxi: add DDR2 support to H3-like DRAM controller

[Icenowy Zheng]

09.01.2017, 18:01, "Maxime Ripard" <maxime.ripard at free-electrons.com>:
> On Fri, Jan 06, 2017 at 06:55:05AM +0800, Icenowy Zheng wrote:
>>  > > +        MCTL_CR_32BIT /* fixme, thats wrong but what boot0 does */ |
>>  >
>>  > What's wrong about it?
>>
>>  V3s DRAM seems to be 16-bit.
>>
>>  However, boot0 has this bit set, and without this bit, it cannot work.
>>
>>  According to Jens' guess (only guess), this may be something more
>>  like full-width and half-width.
>
> Ok. Please put that in the comments then.

Now I think it's not only guess.

See dram_sun8i_a33.h, which has MCTL_CR_BUSW8 = 0 << 12 and MCTL_CR_BUSW16 = 1 << 12.

>
> Thanks!
> Maxime
>
> --
> Maxime Ripard, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com