[U-Boot] WG: Linux hang

Hi all, does anybody have an idea for the following problem?

* FPGA is programmed using an overlay * FPGA writes to SDRAM via the FPGA2SDRAM-bridge * Linux hangs and the watchdog resets the board (the FPGA stays programmed) * After the reset and boot, the FPGA is reprogrammed using the same overlay * Now, the FPGA can write to the SDRAM without a problem

The environment:

*Board:   DE0-NANO-SoC *U-Boot: 2017.11 *Kernel:  4.14.0-rc7 (review-v4.14-rc7-non-dt-support-v5.1 branch)

The overlay:

/dts-v1/; /plugin/;

/ {         fragment@0 {                 target-path = "/soc/base_fpga_region";                 #address-cells = <1>;                 #size-cells = <1>;                 __overlay__ {                         #address-cells = <1>;                         #size-cells = <1>;                         fpga-bridges = <&fpga_bridge0 &fpga_bridge1>;                         firmware-name = "foo_base.rbf";

fpga-bridge@ffc25080 {                                 compatible = "altr,socfpga-fpga2sdram-bridge";                                 reg = <0xffc25080 0x4>;                                 bridge-enable = <1>;                         };

foo@ff200000 {                                 compatible= "altr,bar";                                 interrupt-parent = <&intc>;                                 interrupts = <0 40 4>;                         };

};         }; };

Thanks