From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Seiderer Date: Fri, 15 Jan 2016 22:35:41 +0100 Subject: [Buildroot] SPI module on Raspberry Pi B+ In-Reply-To: <5698EEC2.7030806@yahoo.fr> References: <5698EEC2.7030806@yahoo.fr> Message-ID: <20160115223541.0c4cb053@gmx.net> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net Hello David, On Fri, 15 Jan 2016 14:06:10 +0100, David Picard wrote: > Hello, > > I just switched from Buildroot 2015.08.1 to 2015.11.1, and tried to keep > the same configuration. SPI was working well, before the switch. > > Now, I am having some trouble with the SPI driver, namely spi_bcm2835 : > when I insert the module, there is no log in dmesg output, and nothing > is created in /sys/bus/spi/devices. > Did you try with a fresh build using the 2015.11.1 configs/raspberrypi_defconfig? Did you enable spi support (on the target SD card) in the config.txt file? I use the following for hifiberry-dac+ support (and Adafruit PiTFT): diff -u config.txt_orig config.txt --- config.txt_orig 2015-09-29 21:11:00.000000000 +0200 +++ config.txt 2015-10-01 21:22:14.000000000 +0200 @@ -18,3 +18,30 @@ gpu_mem_256=100 gpu_mem_512=100 gpu_mem_1024=100 + +# +# from https://www.raspberrypi.org/documentation/configuration/device-tree.md +# +dtdebug=1 + +# Uncomment some or all of these to enable the optional hardware interfaces +dtparam=i2c_arm=on +dtparam=i2s=on +dtparam=spi=on +dtoverlay=hifiberry-dacplus Regards, Peter > I could make it work by loading spi_bcm2708 instead, despite the > deprecated warning. In this case, I get some logging messages and > /sys/bus/spi/devices/spi0.0 and /sys/bus/spi/devices/spi0.1 appear. > > Any idea ? > > David. > > ------------------ > Board : Raspberry Pi B+ > Buildroot : 2015.11.1 > SPI peripheral : Adafruit PiTFT 2.8" > _______________________________________________ > buildroot mailing list > buildroot at busybox.net > http://lists.busybox.net/mailman/listinfo/buildroot