I have the same problem with the bielen2k.
2.4.5 works fine on my router ,but 2.5.0-2.5.4 returns the same message.
A newer kernel is required to run this binary. (__kernel_cmpxchg64 helper)
Aborted
My cpuinfo ,it`s a Broadcom BCM4709C0 same as ASUS RT-AC88U.
Processor : ARMv7 Processor rev 0 (v7l)
processor : 0
BogoMIPS : 2798.38
processor : 1
BogoMIPS : 2798.38
Features : swp half thumb fastmult edsp
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x3
CPU part : 0xc09
CPU revision : 0
Hardware : Northstar Prototype
Revision : 0000
Serial : 0000000000000000
