[PATCH rtems-docs] user/imx: Add i.MX6UL/ULL.

[Christian Mauderer]

On 02/04/2020 16:51, Gedare Bloom wrote:
> On Thu, Apr 2, 2020 at 8:43 AM Christian Mauderer
> <christian.mauderer at embedded-brains.de> wrote:
>>
>> Update #3869
>> ---
>>  user/bsps/arm/imx.rst | 49 ++++++++++++++++++++++++++++++++++++++++++++++---
>>  1 file changed, 46 insertions(+), 3 deletions(-)
>>
>> diff --git a/user/bsps/arm/imx.rst b/user/bsps/arm/imx.rst
>> index bc93ae3..51c3b7e 100644
>> --- a/user/bsps/arm/imx.rst
>> +++ b/user/bsps/arm/imx.rst
>> @@ -7,9 +7,10 @@ imx (NXP i.MX)
>>  ==============
>>
>>  This BSP offers only one variant, the `imx7`.  This variant supports the i.MX
>> -7Dual processor.  The basic hardware initialization is not performed by the
>> -BSP.  A boot loader with device tree support must be used to start the BSP,
>> -e.g. U-Boot.
>> +7Dual processor and the i.MX 6UL/ULL processor family (with slightly different
>> +clock settings).  The basic hardware initialization is not performed by the BSP.
>> +A boot loader with device tree support must be used to start the BSP, e.g.
>> +U-Boot or barebox.
>>
>>  Build Configuration Options
>>  ---------------------------
>> @@ -40,9 +41,30 @@ The following options are available at the configure command line.
>>  ``IMX_CCM_UART_HZ``
>>     The UART clock frequency in Hz (default is 24000000).
>>
>> +``IMX_CCM_ECSPI_HZ``
>> +   The ECSPI clock frequency in Hz (default is 67500000).
>> +
>>  ``IMX_CCM_AHB_HZ``
>>     The AHB clock frequency in Hz (default is 135000000).
>>
>> +``IMX_CCM_SDHCI_HZ``
>> +   The SDHCI clock frequency in Hz (default is 196363000).
>> +
>> +Clock settings for different boards
>> +-----------------------------------
>> +
>> +The default clock settings are targeted for an i.MX 7Dual evaluation board using
>> +U-Boot. Some other boards with different boot loaders need different settings:
>> +
>> + * Phytec phyCORE-i.MX 6ULL (system on module) with MCIMX6Y2CVM08AB and a
>> +   barebox bootloader (version ``2019.01.0-bsp-yocto-i.mx6ul-pd19.1.0``):
>> +
>> +   * IMX_CCM_IPG_HZ=66000000
>> +   * IMX_CCM_UART_HZ=80000000
>> +   * IMX_CCM_AHB_HZ=66000000
>> +   * IMX_CCM_SDHCI_HZ=198000000
>> +   * IMX_CCM_ECSPI_HZ=60000000
>> +
>>  Boot via U-Boot
>>  ---------------
>>
>> @@ -65,6 +87,14 @@ The ``loadfdt`` command may be not defined in your U-Boot environment.  Just
>>  replace it with the appropriate commands to load the device tree at
>>  ``${fdt_addr}``.
>>
>> +Boot via barebox
>> +----------------
>> +
>> +The same command like for U-Boot can be used to generate an application image.
>> +In a default configuration barebox expects an fdt image called `oftree` and a
>> +kernel image called `zImage` in the root folder of the bootable medium (e.g. an
>> +SD card).
>> +
>>  Clock Driver
>>  ------------
>>
>> @@ -133,6 +163,18 @@ system controls:
>>  A value of zero for the time or count disables the interrupt coalescing in the
>>  corresponding direction.
>>
>> +On the Phytec phyCORE-i.MX 6ULL modules the PHY needs an initialization for the
>> +clock. A special PHY driver handles that (``ksz8091rnb``). Add it to your libbsd
>> +config like that:
>> +
>> +.. code-block:: c
>> +
>> +    #define RTEMS_BSD_CONFIG_BSP_CONFIG
>> +    #define RTEMS_BSD_CONFIG_INIT
>> +    SYSINIT_DRIVER_REFERENCE(ksz8091rnb, miibus);
>> +    #include <machine/rtems-bsd-config.h>
>> +
>> +
> Is the extra space needed here?
> 

No, sorry. That was an accident.

>>  MMC/SDCard Driver
>>  -----------------
>>
>> @@ -147,3 +189,4 @@ Caveats
>>  The clock and pin configuration support is quite rudimentary and mostly relies
>>  on the boot loader.  For a pin group configuration see
>>  ``imx_iomux_configure_pins()``.  There is no power management support.
>> +
> 
> Many docs end without the blank line. It does cause git to complain.
> I'm not sure if we have any rule about it for writing docs.
> 

Hm. That line shouldn't even be there. I don't wanted to add a blank
line at the end. I'll remove it again.

>> --
>> 2.16.4
>>
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>> http://lists.rtems.org/mailman/listinfo/devel

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