On Fri, 09 Oct 2020 19:40:57 +0200, Kurt Van Dijck wrote: > On Fri, 09 Oct 2020 18:24:02 +0200, Marc Kleine-Budde wrote: > > On 10/9/20 4:16 PM, Kurt Van Dijck wrote: > > > Any ideas what to look for? > > > > The mcp2517fd suffers from the MAB TX underflow errata: See 1. in > > http://ww1.microchip.com/downloads/en/DeviceDoc/MCP2517FD-External-CAN-FD-Controller-with-SPI-Interface-20005688B.pdf > > > > Compile the driver with "#define DEBUG" or remove the > > "MCP251XFD_QUIRK_MAB_NO_WARN" from the mcp251xfd_devtype_data_mcp2517fd. Then > > you should see an error message when the chip switches modes due to the MAB > > underrun. > I'll do this. Yep, TX MAB underflow it is. Thanks for the suggestion. Kind regards, Kurt
