On Fri, May 8, 2015 at 4:13 AM, Sebastian Andrzej Siewior <sebastian@xxxxxxxxxxxxx> wrote: > + > + /* > + * Can we enable the DMA support? Be aware that > + * at least IMX6 needs to load external SDMA firmware in > + * order work properly. The in-ROM firmware is not > + * wokring properly. > + */ On my tests: Prior to this patch: with the internal ROM SDMA firmware I got UART issues when communicating through a Bluetooth module. With external SDMA firmware (version 3.1) it worked fine. With your patch applied: Bluetooth worked fine even with no external SDMA firmware, which does not match the comments you added. Can't you just remove these comments? Thanks -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html