On 30/06/2019 17:59, Vijay Kumar Banerjee wrote:
> Hello everyone,
>
> I'm happy to state that with the following patchset, I now have
> the Framebuffer device (/dev/fb0) created in Beaglebone Black
> and I have tested it in the Hardware with BBB RevC.
>
> From here, the next steps would definitely be to find a way to
> write and read from the framebuffer device. In FreeBSD, the fbd
> read/write are empty:
>
> ```
> static int
> fb_read(struct cdev *dev, struct uio *uio, int ioflag)
> {
> return (0); /* XXX nothing to read, yet */
> }
> static int
> fb_write(struct cdev *dev, struct uio *uio, int ioflag)
> {
> return (0); /* XXX nothing written */
> }
> ```
>
> The read/write happens through the fb_mmap so there are
> two possible ways :
>
> 1. Add mmap support
> 2. Add the read/write functions.
>
> If no one objects, I would like to move forward with the first option
> to add the mmap support. I will start by looking at the other file
> systems that implement mmap in RTEMS and gradually move to
> adding the mmap in cdevsw structure in libbsd.
>
> Thanks,
> Vijay
Hello Vijay,
sounds OK to me. It will be great if the frame buffer device not only
appears but if you can actually do something with it ;-)
Best regards
Christian Mauderer
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