You have apparently used one or more pins that conflict with the boot configuration pins on the BBB, or the eMMC.
Read the "BeagleBone Black System Reference Manual" (Version C.1), pages 62, 63, 68, 82, 106, 107. == On Saturday, August 5, 2017 at 4:43:55 AM UTC-5, Hee-cheol Yang wrote: > > Hello, I am writing this mail to get some advices for my problem I am > suffering from. > > > > I am currently testing my MCP2515 CAN module to test CAN communication via > Beaglebone black. > > However, when I connected MCP 2515 via SPI and powered ON, the UART consol > just prints ‘CCCCCCC..” repeatly. > > I know that this message prints when the BBB couldn’t find proper bootable > image. However, the booting is done successfully when I disconnect the > MCP2515. > > That is, it seems that the SPI devices are conflicting with EMMC or uSD. > > I tested booting with these combinations: > > > > EMMC booting – SPI0 (boot fail) > > EMMC booting – SPI1 (boot fail). > > uSD booting – SPI0 (boot fail) > > uSD booting – Spi1 (boot fail) > > > > Please give me some advices to solve my problems.. > > > > Best regards. > > > > Heecheol, Yang > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/09bb774c-cb00-4251-9afb-a38463aed440%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
