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Bug#747364: linux: [armhf/armmp] Enable support for BeagleBone Black



Control: tag -1 moreinfo

On Wed, 2014-05-07 at 18:10 -0700, Vagrant Cascadian wrote:
> On Wed, May 07, 2014 at 01:46:53PM -0700, Vagrant Cascadian wrote:
> > The following patch enables configuration options needed for use with
> > BeagleBone Black.
> > 
> > Ethernet, serial console, MMC support work. Video may require some additional
> > patches from upstream...
> 
> Updated patch with support for video output as modules:
>   CONFIG_DRM_I2C_NXP_TDA998X=m
>   CONFIG_DRM_TILCDC=m
> 
> Thanks to Robert C. Nelson for the additional options!
> 
> USB support seems flaky, at best... not sure if there are other options that
> could improve that.

I think that's because the MUSB driver can only be built with support
for one type of DMA controller, and so doesn't support DMA at all in
multiplatform kernels.

> live well,
>   vagrant
> 
> diff --git a/config/armhf/config.armmp b/config/armhf/config.armmp
> index c43f74e..0ab26fc 100644
> --- a/config/armhf/config.armmp
> +++ b/config/armhf/config.armmp
[...]
> @@ -170,6 +185,8 @@ CONFIG_IMX_SDMA=y
>  CONFIG_IMX_DMA=y
>  CONFIG_MXS_DMA=y
>  CONFIG_DMA_OMAP=y
> +CONFIG_TI_CPPI41=y

Why not =m?  (It looks like this is only needed for USB anyway, which
means it's not used at all yet.)

[...]
> +## file: drivers/i2c/Kconfig
> +##
> +CONFIG_I2C_CHARDEV=y

This symbol seems to be enabled in most configurations that have I2C,
but often as a module.  When built as a module, it won't be auto-loaded,
though userland could explicitly load it if needed.

What userland programs need this, and do they try to load the module
(which will be needed in some configurations)?

[...]
> +CONFIG_SERIAL_OF_PLATFORM=y
[...]

This seems to select some glue code for 8250-like serial ports, and the
following symbols don't depend on it.

And in am33xx.dtsi, all the UARTs have compatible = "ti,omap3-uart".

Ben.

-- 
Ben Hutchings
Beware of programmers who carry screwdrivers. - Leonard Brandwein

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