[U-Boot] A23 u-boot with SPL / dram init available in my personal git repo

[Hans de Goede]

Hi,

On 08-12-14 15:28, Chen-Yu Tsai wrote:
> On Mon, Dec 8, 2014 at 4:27 AM, Hans de Goede <hdegoede at redhat.com> wrote:
>> Hi,
>>
>> This is still a bit rough around the edges, I'll clean it up as
>> time permits and then post it upstream.
>>
>> In the mean time people interested can find $subject here:
>> https://github.com/jwrdegoede/u-boot-sunxi/commits/sunxi-wip
>
> Hopefully I'll get around to testing this. BTW, what tablet do
> you have?

I've an Ippo q8h v1.2, there are at least 2 differences from the
v5 you've. The dram clk speed and zq value are different, and the wifi
is different. The wifi does not matter for u-boot, but does mean we
need separate dtb files for the 2.

My u-boot sunxi-wip branch has a defconfig for the v1.2, you should be
able to copy that over to the v5 defconfig, adjust dram clk and zq values
with the ones from the v5 fix, change v1.2 to v5 in the CONFIG_FDTFILE
setting and thats it.

Let me know if this works, then I'll also include an update for the v5
defconfig to enable the SPL when I send this upstream.

>> ChenYu, this also has a mmc fix which you may find interesting,
>> it may explain some of the problems with mmc you've been having
>> on both the A80 board, as well as the A31 dev board you've.
>
> Yes. With that fix my Hummingbird A31 boots properly without
> raising DCDC1 to 3.3V.
>
> Thanks! I'll send the defconfig out later.

Good, so I guess this means that DCDC1 should be 3V for your board,
since that is what the factory firmware uses, right ?

I guess it is time to make DCDC1 voltage configurable.

Regards,

Hans