Hi Andrew, On Fri, Nov 16, 2018 at 9:40 PM Andrew Lunn <and...@lunn.ch> wrote: > On Fri, Nov 16, 2018 at 04:28:29PM -0200, Otavio Salvador wrote: > > RV1108 GMAC is connected to KSZ8863 port 3 and after kernel boots, I > > can put an Ethernet cable from my router to the uplink port of > > KSZ8863, which makes the RV1108 board and a Linux PC connected to the > > other KSZ8863 port to both get IP addresses. > > > > So in this usecase the setup is working fine. > > > > However, if the RV1108 board boots with both Ethernet cables to the > > KSZ8863 switch connected, then the kernel silently hangs. > > By silently, you mean it prints nothing at all?
Yes, it prints but suddenly hangs. > I would try building the kernel with all the lock debugging turned > on. That might find something even with your working case, if there is > a potential deadlock. > > If the kernel dies very early, you might need to enable "kernel > low-level debugping print and EARLY_PRINTK, in order to see anything. The kernel starts booting normally and then hangs like this when two Ethernet cables are connected to the KSZ8863 switch: http://dark-code.bulix.org/3xexu5-507563 This has the lock detection, inside kernel hacking, enabled. Any hint? -- Otavio Salvador O.S. Systems http://www.ossystems.com.br http://code.ossystems.com.br Mobile: +55 (53) 9 9981-7854 Mobile: +1 (347) 903-9750
