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

[Hans de Goede]

Hi,

On 13-12-14 17:07, Chen-Yu Tsai wrote:
> Hi,
>
> On Sat, Dec 13, 2014 at 9:58 PM, Hans de Goede <hdegoede at redhat.com> wrote:
>> Hi,
>>
>> On 09-12-14 13:31, Chen-Yu Tsai wrote:
>>
>> <snip>
>>
>>> Also I have a schematic file for A23 that someone provided me.
>>> I don't remember who...
>>>
>>> It lists:
>>>     - ALDO2 connected to VCC-DLL @ 2.5V
>>>     - ALDO3 to VCC-PLL and AVCC (analog power) @ 3.0V
>>>     - DCDC1 to all the normal stuff @ 3V
>>>     - DCDC2 to VDD-SYS @ 1.1V
>>>     - DCDC3 to VDD-CPU (main cpu) @ 1.1V (1.26V in my fex file)
>>>     - DCDC5 to VCC-DRAM @ 1.1V (1.5V in my fex file)
>>>     - DC5LDO to VDD-CPUS (special cpu)
>>
>>
>> Thanks for this info!
>>
>> I've prepared a sun8i / A23 set for u-boot which I'll send upstream
>> as soon as I've verified that it does not break A31 support.
>>
>> One thing which I've done is make u-boot explicitly disable power
>> outputs which are unused, the specific target for this is DCDC4
>> which is enabled by default at power on and not used on sun8i.
>>
>> As a side effect this also disabled ALDO1 which is enabled at power
>> on too, and guess what, promptly my sdcard stopped working.
>>
>> So it seems that ALDO1 is hookedup to the sdcard on the Ippo
>> tablets, for now I've also enabled ALDO1 in the defconfig for V5, it would
>> be great if you could give my current sunxi-wip branch a try on your
>> V5 tablet, and if it works remove the setting of ALDO1 from the V5
>> defconfig and then try again. If it is like my V1.2 then it will
>> stop booting when the SPL tries to load u-boot from the sdcard.
>
> I missed that one. ALDO1 is connected to VCC-IO (pin controller I think),
> VCC-PD (whatever that is, it isn't on the datasheet, but the schematic
> implies it's part of the LCD block), VCC-USB (USB block in the SoC),
> VCC-IO-WIFI (pull-ups and stuff for mmc wifi), and HPVCC (builtin
> headphone amp).

Thanks for the info. Weird thing is it is not listed in the fex, and
android on my Ippo Q8H v1.2 seems to set it to 2.5 volt, which is somewhat
lowish, it is below the minimum recommended voltage for Vusb (which is 2.7)
and way below the minimum recommended voltage for HPVCC which is 3.0,
according to the A31 datasheet (the A23 datasheet does not list it).

I've updated the defconfigs to set ALDO1 to 3.0 V and gave them a comment
to explain to which voltages it is connected.

As for VCC-PD it is in the A23 datasheet, in the "pin description" chapter
under GPIO-D, it powers the port D gpio pins.

Regards,

Hans