On Wed, Jul 10, 2019 at 12:40 PM Christian Mauderer < christian.maude...@embedded-brains.de> wrote:
> On 09/07/2019 21:13, Vijay Kumar Banerjee wrote: > > Hello all, > > > > First the status : > > * The fbd has been ported and it's attaching with the fb0 devie. There's > > an fb0 device entry created. > > * In the following commit I have added mmap to libbsd. This works like a > > wrapper to the mmap in cpukit > > : > https://github.com/thelunatic/rtems-libbsd/commit/a8fc3b2b6840465029a000cc4169e9efbd551097 > > > > Blocker : > > * After the fb0 is created and mmap is added, I don't see anything on > > the screen. From the FreeBSD, it seemed like the VT driver is needed > > and that is responsible for turning on the screen. So I have ported a > > minimal version of the VT with only the initialization and allocate > parts: > > > https://github.com/thelunatic/rtems-libbsd/commit/95279e116717973525b581ae2e9550d1d3b8e1ba > > > > But even after porting the VT driver which initializes well ( As the > > message during booting says). I don't see anything on the screen. > > I need some ideas on what is missing or how to debug this. > > > > The app I'm using to test framebuffer is pushed here : > > https://github.com/thelunatic/rtems-bbb/tree/master/apps/fb-sample > > > > Any idea regarding this is greatly appreciated. > > > > Thanks, > > Vijay > > > > Hello Vijay, > > did you have a look at the SPI of the HDMI framer? What is it used for > according to the data sheet? Is it necessary for the driver? > > Hi, >From the datasheet, it seems that the SPI1_CS0 and SPI1_D0 pins are configured as I2S interface for the audio. I think this is not necessary and it is enabled only for a few selected resolutions that support audio. > From our chat discussions and my own tests I know that the screen is > still not receiving a signal. So I would assume some quite basic > problem. If your new mmap wouldn't work, you should still get at least a > black screen. > > I was also hoping that VT will do the initialization and turn the screen On. There might be something useful that I omitted during the porting. If you can please review the commit, I can send it in the devel. > Best regards > > Christian > -- > -------------------------------------------- > embedded brains GmbH > Herr Christian Mauderer > Dornierstr. 4 > D-82178 Puchheim > Germany > email: christian.maude...@embedded-brains.de > Phone: +49-89-18 94 741 - 18 > Fax: +49-89-18 94 741 - 08 > PGP: Public key available on request. > > Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG. >
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