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 -- balbi
Attachment:
signature.asc
Description: Digital signature
