[U-Boot] [PATCH 3/6] sunxi: add Cubieboard2 support

[Chen-Yu Tsai]

On Thu, Jul 24, 2014 at 11:12 AM, Siarhei Siamashka
<siarhei.siamashka at gmail.com> wrote:
> On Thu,  5 Jun 2014 19:00:14 +0100
> Ian Campbell <ijc at hellion.org.uk> wrote:
>
>> This is a sun7i (A20) based followup to the sun4i (A10)
>> Cubieboard. It has GMAC using MII mode.
>>
>> Signed-off-by: Ian Campbell <ijc at hellion.org.uk>
>> Acked-by: Hans de Goede <hdegoede at redhat.com>
>
> This board is using exactly the same PCB as the Cubieboard1. And only
> the SoC is different (Allwinner A20 instead of the pin-compatible
> Allwinner A10).
>
> Before piling up more board configurations, we might want to consider
> supporting both Cubieboard1 and Cubieboard2 with a single u-boot binary
> (and perhaps keep Cubieboard1 and Cubieboard2 as aliases in boards.cfg).
> The Allwinner SoCs have support for runtime identification of the SoC
> type (sun4i/sun5i/sun7i) via the VER_REG (Version Register) located at
> the address 0x01C00024 as explained in the Allwinner A20 user manual.
> This requires replacing all the CONFIG_SUN4I/CONFIG_SUN5I/CONFIG_SUN7I
> ifdefs in the u-boot code with a runtime SoC type checks, but there
> are not too many places affected (mostly just the DRAM code).

A20 will need PSCI for SMP and virtualization support.
(I know the related code isn't in there yet.)
Won't this be slightly hard to do if you mix them together?

Just a though.

Cheers
ChenYu

> Here is a quick and dirty example (not a patch submission yet), which
> allows to boot the Cubieboard2 hardware using the existing Cubieboard1
> config:
>     https://github.com/ssvb/u-boot-sunxi-dram/commit/3153905e0221
>
> If the u-boot code is further extended to define a variable with the
> relevant dtb file name in the u-boot environment (depending on the
> runtime detected SoC type and selecting from "sun4i-a10-cubieboard.dtb"
> and "sun7i-a20-cubieboard2.dtb"), then we can have the same SD card
> with the whole pre-installed Linux system usable on both Cubieboard1
> and Cubieboard2 hardware by just swapping the card.
>
> Also the Cubieboards are not alone. Sharing the same PCB happens for
> the LIME boards from Olimex too:
>    https://www.olimex.com/Products/OLinuXino/A10/A10-OLinuXino-LIME
>    https://www.olimex.com/Products/OLinuXino/A20/A20-OLinuXino-LIME
>
>>  Active  arm         armv7          sunxi       -               sunxi               Cubieboard                            sun4i:CUBIEBOARD,SPL,AXP209_POWER,SUNXI_EMAC                                                                                      Hans de Goede <hdegoede at redhat.com>
>> +Active  arm         armv7          sunxi       -               sunxi               Cubieboard2                           sun7i:CUBIEBOARD2,SPL,SUNXI_GMAC                                                                                                  Ian Campbell <ijc at hellion.org.uk>:Hans de Goede <hdegoede at redhat.com>
>> +Active  arm         armv7          sunxi       -               sunxi               Cubieboard2_FEL                       sun7i:CUBIEBOARD2,SPL_FEL,SUNXI_GMAC                                                                                              Ian Campbell <ijc at hellion.org.uk>:Hans de Goede <hdegoede at redhat.com>
>
> The newly added Cubieboard2 from your patch appears to be missing the
> important AXP209_POWER option. So the patch is not good enough to be
> pushed anywhere in its current form.