I did the following verification on LX2160ARDB, it seems that your u-boot boot parameters works normally.
In u-boot:
=> setenv othbootargs "iommu.passthrough=1 default_hugepagesz=1024m hugepagesz=1024m hugepages=10 isolcpus=1-15 rcupdate.rcu_cpu_stall_suppress=1 nohz_full=1-15 rcu_nocbs=1-15"
=> setenv bootargs "console=ttyAMA0,115200 root=/dev/ram0 earlycon=pl011,mmio32,0x21c0000 $othbootargs"
=> tftp 0xa0000000 b25805/ls1046ardb/lsdk2108_yocto_tiny_LS_arm64.itb
=> bootm 0xa0000000#lx2160ardb
In Linux Kernel:
root@TinyLinux:~# cat /proc/meminfo
MemTotal: 30683148 kB
MemFree: 20053640 kB
MemAvailable: 19879744 kB
Buffers: 0 kB
Cached: 63892 kB
SwapCached: 0 kB
Active: 128 kB
Inactive: 3572 kB
Active(anon): 128 kB
Inactive(anon): 3572 kB
Active(file): 0 kB
Inactive(file): 0 kB
Unevictable: 63632 kB
Mlocked: 0 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 0 kB
Writeback: 0 kB
AnonPages: 3440 kB
Mapped: 4340 kB
Shmem: 260 kB
KReclaimable: 7632 kB
Slab: 28340 kB
SReclaimable: 7632 kB
SUnreclaim: 20708 kB
KernelStack: 2976 kB
PageTables: 296 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 10098692 kB
Committed_AS: 14196 kB
VmallocTotal: 135290159040 kB
VmallocUsed: 6044 kB
VmallocChunk: 0 kB
Percpu: 4032 kB
HardwareCorrupted: 0 kB
AnonHugePages: 0 kB
ShmemHugePages: 0 kB
ShmemPmdMapped: 0 kB
FileHugePages: 0 kB
FilePmdMapped: 0 kB
CmaTotal: 32768 kB
CmaFree: 18816 kB
HugePages_Total: 10
HugePages_Free: 10
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 1048576 kB
Hugetlb: 10485760 kB
root@TinyLinux:~#
If your problem persists, please capture your whole boot console log to me to do more investigation.
