[seL4] Linux binaries constructed by Buildroot cannot run on tk1 board

Hi， I use Buildroot 2016.08.1 with the config "buildroot_tk1_initrd_defconfig" to compile linux-tegra(https://github.com/SEL4PROJ/linux-tegra/tree/sel4), everything goes well. But the linux binary cannot output any logs, camkes-arm-vm stops at “Starting VM”. Can anyone tells me where might be wrong? I have tried using cross-compiler arm-none-linux-gnueabi-(2014.05) to compile linux-tegra, and that linux binary can work.