Re: Cubox-i 4x4 RAM [was Re: Performance of armhf boards]
On Oct 5, 2016, at 1:54 PM, Vagrant Cascadian <vagrant@debian.org> wrote:
> On 2016-10-01, Rick Thomas wrote:
>> On Jun 5, 2016, at 1:35 PM, Vagrant Cascadian <vagrant@debian.org> wrote:
>>> On 2016-06-05, Gaudenz Steinlin wrote:
>>>> I have the same problem with my Cubox-i 4x4. Is there any progress on
>>>> this?
> ...
>>>> Are the patches incorporated into the latest version in experimental?
>>>
>>> No, it requires a patch that does run-time detection. At least the
>>> versions of u-boot in debian currently boot on both cubox-i4x4 and
>>> cubox-i4pro, even if it limits ram to 2gb on the i4x4.
>>>
>>>
>>>> Is there anything I could test to get this into Debian?
>>>
>>> Someone could write a patch acceptible for u-boot upstream that does
>>> run-time detection... there may be folks on #u-boot on irc.freenode.net
>>> willing to help a bit.
>>>
>>> It also might be good to file a bug report against the u-boot-imx
>>> package in Debian at this point, so that the issue can at least be
>>> tracked appropriately.
> ...
>> Sorry to bring this back up after such a long time, but I had a couple
>> of thoughts that I’d like to bounce off those more knowledgable than
>> I.
>>
>> Would it be possible to do one or the other of these two:
>>
>> 1) Put the 2GB vs 4GB setting in the .dtb file.
>>
>> 2) Put setting in a kernel command line argument.
>
> I believe it actually requires u-boot to initialize ram timings and
> various other parameters. You can trick the kernel into using more
> memory, but in my experience that just caused crashes when trying to use
> more ram than u-boot initilized.
>
> It would of course be useful to experiment with alternative methods, but
> my guess is getting proper patches into u-boot may likely be the
> simplest approach. It just takes some work.
scanning the subject lines in the u-boot list, it looks like somebody has
made this work for a different (from the Cubox) architecture.
> Subject: Re: [U-Boot] [PATCH v2 2/3] rk3288: sdram: auto-detect the capacity
Would you be interested in getting it to work on the Cubox i-4x4?
It looks like the next couple of weeks for me will be free enough to do some testing, if you’re willing.
Rick
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