[Buildroot] Fwd: [PATCH v3] linux: add fbtft kernel extension

* [Buildroot] Fwd:  [PATCH v3] linux: add fbtft kernel extension
@ 2015-01-05 22:34 Peter Seiderer
  2015-01-05 23:03 ` Lou Crittenden
  0 siblings, 1 reply; 6+ messages in thread
From: Peter Seiderer @ 2015-01-05 22:34 UTC (permalink / raw)
  To: buildroot

Hello Lou,

On Mon, Jan 05, 2015 at 03:46:40PM -0600, Lou Crittenden wrote:
> >Hello 'thebestofall007',
> 
> >first: please use e-mail with a real name, its much nicer to answer
> >to real persons ;-)
> 
> >second: please keep  buildroot at busybox.net on CC, others will be interested
> >in the answers too (or will answer with useful hints)...
> 
> Sorry about that. Is this better? I hope so. If not, please let me know. I
> forwarded the message to buildroot at busybox.net and changed my "send as"
> info to my real name (I also use this account on youtube)
> 

Much better now... ;-)

> Those commands you posted are working fabulously and am building the setup
> as I type. Does this build all the modules, or just for the adafruit model
> you have in the pics?
> 

With the given patch NO modules are automatically selected, you have to seclect what
your need in the '$ make linux-menuconfig' step, see the fbtft help text:

+       help
+         Linux Framebuffer drivers for small TFT LCD display modules,
+         e.g. Adafruit PiTFT displays for Raspberry Pi.
+
+         To enable fbtft, e.g. for Adafruit 2.8 PiTFT, enable the
+         following kernel configuarations:
+         - CONFIG_SPI: Device Drivers ---> SPI support
+         - CONFIG_SPI_BCM2708: Device Drivers ---> SPI support
+                                  ---> BCM2708 SPI controller driver
+         - CONFIG_GPIOLIB: Device Drivers ---> GPIO Support
+         - CONFIG_FB: Device Drives ---> Graphics support
+                         ---> Support for frame buffer devices
+         - CONFIG_FB_TFT: Device Drivers ---> 
+                            Support for small TFT LCD display modules
+         - CONFIG_FB_TFT_ILI9341: Device Drivers --->
+                            Support for small TFT LCD display modules --->
+                              FB driver for the ILI9341 LCD Controller
+         or another FB_TFT submodule corresponding to your display.

You mentioned somewhere you use a waveshare32b module? For this you need to enable
submodule fb_ili9340 via CONFIG_FB_TFT_ILI9340 (translation from given module name
to submodule is done in the file fbtft_device.c)...

Regards,
Peter

> 
> 
> 
> 
> 
> ---------- Forwarded message ----------
> From: Peter Seiderer <ps.report@gmx.net>
> Date: Mon, Jan 5, 2015 at 7:45 AM
> Subject: Re: [Buildroot] [PATCH v3] linux: add fbtft kernel extension
> To: "thebestofall007 ." <loucrittenden63@gmail.com>
> Cc: buildroot at busybox.net
> 
> 
> Hello 'thebestofall007',
> 
> first: please use e-mail with a real name, its much nicer to answer
> to real persons ;-)
> 
> second: please keep  buildroot at busybox.net on CC, others will be interested
> in the answers too (or will answer with useful hints)...
> 
> and last some real answers ;-)
> 
> On Mon, Jan 05, 2015 at 01:48:32AM -0600, thebestofall007 . wrote:
> > I found the patch and am in the process of applying it to buildroot. I
> > added the path to the patch on my system to the BR2_LINUX_KERNEL_PATCH
> > field in the make xconfig/menuconfig setup (is that how you applied the
> > patch and got it to work?). Furthermore, fergie4000 was able to apply the
> > patch to the build and got the modules to build against buildroot, as per
> > here: https://github.com/notro/fbtft/issues/209#issuecomment-68645175. I'm
> > scratching my head to figure out the steps to reproduce fergie's
> successful
> > build for my application, but I figure once I do, I bet it will be super
> > easy.
> >
> 
> The following sequence of commands should work:
> 
> - prepare buildroot (or use your already downloaded version):
>         $ mkdir tmp
>         $ cd tmp/
>         $ wget
> http://buildroot.uclibc.org/downloads/buildroot-2014.11.tar.bz2
>         $ tar -xvjf buildroot-2014.11.tar.bz2
> 
> - download my latest patch from patchwork:
>         $ wget -O v3-linux-add-fbtft-kernel-extension.patch
> https://patchwork.ozlabs.org/patch/425126/mbox/
> 
> - patch the buildroot package:
>         $ cd buildroot-2014.11/
>         $ patch -p 1 < ../v3-linux-add-fbtft-kernel-extension.patch
>         $ cd ..
> 
> - start a fresch build
>         $ mkdir build_rpi_001
>         $ cd build_rpi_001/
>         $ make O=$PWD -C ../buildroot-2014.11 raspberrypi_defconfig
> 
> - and go to buildroot menuconfig, enable Kernel --> Linux Kernel Extensions
> --> fbtft patch
>         $ make menuconfig
>         $ make
> 
> - the linux source under
> build/linux-c256eb9968c8997dce47350d2075e42f1b3991d3 will be with fbtft
> support,
> so enable it in the linux config as described in the fbtft help text (see
> v3-linux-add-fbtft-kernel-extension.patch):
>         $ make linux-menuconfig
> 
> - rebuild linux kernel and the new modules
>         $ make
> 
> 
> ...install it to sd card as described in
> buildroot-2014.11/board/raspberrypi/readme.txt and test it...
> 
> Hope the description is helpful enough?
> 
> > Nice pictures, btw.
> 
> ...thanks...
> 
> Regards,
> Peter

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