i.MX6 support

[Praveen B]

Hi Martin,

We have tested the ported code on SABRE Lite board and it is working,
except that we need to change UART1 to UART2(0x021e8000).

Our default console for u-boot is UART2. We tried to see the output of
Genode runscript on UART1(by keeping actual values for UART) also but for
some reason we see a non-readable output on UART1. This serial port
hardware do not have any issues, since we are able to use both the serial
ports while running Linux, with same configuration on the same board. If
you know of any possible reasons for enabling this to work correctly,
please let us know.

Regarding RAM region, is it possible to set default values to 1 GB, as
Sabre Lite is having only 1 GB RAM.
Or
Is it possible to pass the size(along with the possible UART interface) as
an option through a variable in Makefile?
(By this we can keep generic variables and assign these generic values
depending on some variable set in make file.)

Apart from these typical configuration changes, we have verified that the
image generated from this branch is working successfully on Sabrelite
board.

Regards
Praveen Srinivas
IIT Madras



On Thu, Mar 26, 2015 at 11:00 PM, Praveen B <srinivasprv at ...9...> wrote:

> Hi Martin,
>
> Good to know the similarities in ESDHC and USDHC. Same method can be
> adopted for USDHC as the driver does not use CID register(only other 132
> bit register).
>
> Taking into consideration all the issues, we have forked another
> repository, https://github.com/iitmadras/genode and updated the commits.
>
> Please take a look at it.
>
> On Thu, Mar 26, 2015 at 8:51 PM, Martin Stein <
> martin.stein at ...1...> wrote:
>
>> Hi Praveen,
>>
>> I've created a branch
>> (https://github.com/m-stein/genode/tree/1467_hw_imx6_support) that works
>> on our Wandboard Quad and our CuBox-i and opened an according issue
>> (https://github.com/genodelabs/genode/issues/1467). Some annotations:
>>
>> * I have not merged the Trustzone support that was started in your
>> branch as there is no scenario for this right now.
>>
>
> We will update on Trustzone support, once we are confident about it.
>
> * I tried to add the L2-cache support from your branch but it doesn't
>> work as it is for our boards. Thus, I didn't merge it.
>>
>
> We tried to add L2-cache support. But it is not working for Sabre Lite
> board as well.  We should have removed it in the previous repository. It is
> updated in the new repository.
>
> * I modified the kernel to not use the EPIT timer but the CortexA9
>> Private Timer because it's our default on CortexA9 CPUs and the better
>> choice when enabling SMP support.
>>
>
> Okay. We will try it on our board. It should work.
>
> By the way, is SMP enabled for CortexA9 processors in the latest base-hw
> version?
> Because In our port if we return false for is_smp() function of our board,
> there is an unresolved page fault in the Core thread.
> We have also assigned variable, NR_OF_CPUS = 1.
>
> * I've merged some redundant code between i.MX6 and i.MX53 into
>> ``spec/imx``
>>
>
> The file 'serial.h' in spec/imx can be an issue for our board, because our
> board uses UART 0x021e8000 as you mentioned below. We'll think about how to
> solve it.
>
>
>> * I've not merged the uSDHC enums and specs that your i.MX6 port
>> includes because they should be added by the uSDHC commit
>>
>> The main differences between our boards and yours seem to be the
>> following:
>>
>> * the Cortex A9 clock (Wand/Cubox: 792 Mhz, Your board: 800 Mhz) but
>> this value isn't needed anyway
>> * the UART instance connected to the serial port (Wand/Cubox:
>> 0x02020000, Your board: 0x021e8000)
>> * the RAM range configuration
>>
>> Do you have any objections regarding the commit? If not, I'd suggest you
>> to re-base your work regarding the i.MX6  onto the branch respectively
>> the Genode master branch as soon as the commit arrived there to simplify
>> our collaboration in the future.
>>
>>
> We will try to run the code on our board as soon as possible and let you
> know, If there are any issues.
>
> Regards
> Praveen Srinivas
> IIT Madras
>
> Cheers,
>> Martin
>>
>>
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