Hi Steven Rosenberg,
On 8/18/2013 22:55, Steven Rosenberg wrote:
Dear Personnel,
We are investigating using U-Boot Driver samples for development on the Atmel's
sama5dxek boards and could use some guidance.
I have reviewed the following:
http://www.chromium.org/chromium-os/u-boot-porting-guide/u-boot-drivers
We are interested in the Ethernet example, but could also use a referral to a
simple example to get started as well. The steps seem to be as follows:
* Implement the APIs specified in the driver class header file.
* Add config option(s) for the peripheral to the board configuration file
in include/configs.
* Add a node for the driver to the device tree
file<http://www.chromium.org/chromium-os/u-boot-porting-guide/2-concepts>
(.dts), specifying its properties and values as well as any additional devices that
are connected to it.
After reading the contents, I am not sure what do you want to implement.
However, in mainline u-boot, we can use emac on sama5d31ek board and
sama5d35ek board.
For Ethernet on sama5d33, d34, d35ek board, it needs gmac patch
(http://patchwork.ozlabs.org/patch/254549/), after apply it, the
Ethernet can work.
or if you get u-boot from: https://github.com/linux4sam/u-boot-at91
The Ethernet works on all the boards.
The Ethernet related command in u-boot, for example: tftp, nfs, ping,
dhcp and etc can work.
The first one I assume refers to the header of the driver (such as the
include/asm-generic/gpio.h file for gpio or the include/net.h file for the
Ethernet project). Please confirm or clarify.
The second seems to be referring to the include/configs/sama5dxek.h file for
the card of interest which does exist. It's just not clear which CONFIG define
to set and what the values would be. They do seem to correlate with the
Makefile definitions in some of the samples. For example we may be interested
in CONFIG_RMMI or CONFIG_RGMII for the Ethernet sample, but it's not clear what
to define them to. Similar examples would help.
The third is the device tree. I did see some samples, but the board/atmel/dts
directory is missing as is the board/atmel/sama5d3xek/dts directory. Actually,
only a few vendors actually give samples.
The usage for setting up device trees is described here:
http://devicetree.org/Device_Tree_Usage
I was wondering if there was an atmel dts example already that we could use at
least as a template rather than creating something from scratch and which
directory it should reside in (board/atmel/ or board/atmel/sama5d3xek/ ?)
The Ethernet example given is not included in the U-Boot installation. It seems
one needs to create a directory under drivers, move the files in and compile
the whole u-boot installation. Then it seems the drivers are part of the
uboot.bin and when the u-boot is loaded by the bootstrap the u-boot will know
how to load the drivers via the device tree. If so, the missing dts for atmel
would mean that the default u-boot isn't loading any drivers for an atmel
installation by default. Clarifications and/or corrections please.
For this, temporary, I have no idea.
Any help and guidance to get us started would be greatly appreciated.
Thank you for your time and consideration.
With Best Regards.
Steven Rosenberg.
Best Regards,
Bo Shen
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