Hi, On Tue, Dec 11, 2012 at 10:38:58AM +0000, Jack Mitchell wrote: > On 11/12/12 10:20, Felipe Balbi wrote: > >Hi, > > > >On Tue, Dec 11, 2012 at 10:17:42AM +0000, Jack Mitchell wrote: > > > ><big snip> > > > >>Shubhro, Felipe, > >> > >>Thank you, the reordering dma patch fixed the dma issue I was having! > >>However, the bad news, I now get the same results for the dma and > >>non-dma spidev test. While the scope shows the SPI clk and data is > >>fine, the reading from the program still shows 0x00 for all words. > ><removed spidev_test output> > > > >>dmesg shows nothing of interest apart from the spi bus setting up. > >>Any ideas? > >> > >>To iterate for my own sanity; I have bridged pins 18 and 21 on the P9 > >>header which should be the d0 and d1 spi data pins for spi0. This > >>result of 0x00 usually comes from a result of not joining the pins, > >>but I can assure you they are joined! > >> > >>Thank you for the help so far. > >according to the schematics [1], those pins are muxed as UART2_TXD and > >I2C1_SDA, have you remuxed them properly ? Can you try with pins 29 and > >30 on the same header ? That's SPI1, so you will have to add DT data for > >spidev on that bus too. > > > >[1] http://beagleboard.org/static/beaglebone/latest/Docs/Hardware/BONE_SCH.pdf > > > > No change unfortunately: > > root@beaglebone:~# ./spidev > spi mode: 0 > bits per word: 16 > max speed: 24000000 Hz (24000 KHz) > > 00 00 00 00 00 00 > 00 00 00 00 00 00 > 00 00 00 00 00 00 > 00 00 00 00 00 00 > 00 00 00 00 00 00 > 00 00 00 00 00 00 > 00 00 > > root@beaglebone:~# ./spidev -D /dev/s > shm/ spidev1.0 spidev2.0 stderr stdin stdout > root@beaglebone:~# ./spidev -D /dev/spidev2.0 > spi mode: 0 > bits per word: 16 > max speed: 24000000 Hz (24000 KHz) > > 00 00 00 00 00 00 > 00 00 00 00 00 00 > 00 00 00 00 00 00 > 00 00 00 00 00 00 > 00 00 00 00 00 00 > 00 00 00 00 00 00 > 00 00 > root@beaglebone:~# weird... I'll try to test with my pandaboard and see what's the outcome of that. -- balbi
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