Hi Peter, On Tue, May 9, 2017 at 3:34 AM, Peter Senna Tschudin <peter.senna@xxxxxxxxxxxxx> wrote: > Something that ocurred to me is that u-boot is initializing the PCI, and > the PCI networkd cards. Ideally this should not affect anything, but > can this be related to the issue? Yes, in order to narrow things down: please boot 4.11 without PCI support in U-Boot. The problem is that mx6q does not have a way to properly reset the PCI block. On the board I tested there is no PCI support in U-Boot. Maybe we need the following approach in U-Boot as Lucas did for Barebox: https://git.pengutronix.de/cgit/barebox/commit/?id=f1da98da2760c21487bbba8f7fb957c843a22896 According to this patch that went into 4.11 the bootloader must put PCI back in a safe state: https://patchwork.kernel.org/patch/9528911
