[U-Boot] U-Boot Device Driver Development Guide

[Simon Glass]

Hi,

On 20 December 2015 at 08:29, Jagan Teki <jteki at openedev.com> wrote:
> On 20 December 2015 at 19:38,  <jerroldm at blackmagicdesign.com> wrote:
>>
>> Dear Sir,
>>
>> I am considering using U-Boot as a software platform to bring up a hardware platform that am developing.  In doing so, I may need to develop a couple of Device Drivers.  I was wondering if anyone could point me to a document or a website that might help guide me to do this in the correction fashion.
>
> If you wanted to develop a drivers on u-boot see this [1] driver model
> text files for more info.
> Each text file has an information on how to write it for respective
> IP, there may be some missing IP's text's but you can grep the source
> using UCLASS_ then you can easily find the drivers which are writing
> using driver model.
>
> If you're new to u-boot, driver model is a new driver design
> implementation in u-boot.
>
>> To be a bit more specific, I have a custom UHS-II SD Card Host Controller which I would like to access through FAT and EXFAT commands.  I am using a Zynq FPGA as a platform.
>
> For zynq mmc there is a driver available on source as
> drivers/mmc/zynq_sdhci.c see this if you want more info.
>
> [1] http://git.denx.de/?p=u-boot.git;a=tree;f=doc/driver-model;h=3312fbcb9336e799c7e8956ac81acfa40f55374b;hb=refs/heads/master
>
> thanks!
> --
> Jagan.

There's also this Chromium guide although it is mostly about porting Chrome OS.

https://www.chromium.org/chromium-os/u-boot-porting-guide

Regards,
Simon